1,720,999 research outputs found
Voltammetric Determination Of Amitriptyline In Pharmaceutical Formulation With Boron-doped Diamond Electrode Exploiting Measures In Acid Medium [determinação Voltamétrica De Amitriptilina Em Formulações Farmacêuticas Com Eletrodo De Diamante Dopado Com Boro Explorando Medidas Em Meio ácido]
No full textA simple and reliable voltammetric method is presented for the determination of amitriptyline using a boron-doped diamond electrode in 0.1 mol L-1 sulfuric acid solution as the support electrolyte. Under optimized differential pulse voltammetry conditions (modulation time 5 ms, scan rate 70 mV s-1, and pulse amplitude 120 mV), the electrode provides linear responses to amitriptyline in the concentration range 1.05 to 92.60 μmol L-1 and at a detection limit of 0.52 μmol L-1. The proposed method was successfully applied in pharmaceutical formulations, with results similar to those obtained using UV-vis spectrophotometric method as reference (at 95% confidence level), as recommended by the Brazilian Pharmacopoeia.37914961502Lermer, H., Avni, J., Bruderman, I., (1971) Eur. J. Pharmacol., 13, p. 266Ali, M.S., Rub, M.A., Khan, F., Al-Lohedan, H.A., Kabir-ud-Din, (2012) J. Mol. Liq., 167, p. 115Silveira, G., Tarley, C.R.T., (2008) Quim. Nova, 31, p. 1653(2000) The United States Pharmacopeia - The National Formulary, pp. 122-123. , USP 24, NF - 19(2010) Farmacopéia Brasileira, Agência Nacional de Vigilância Sanitária, p. 806. , 5a ed., BrasíliaMisiuk, W., (2000) J. Pharm. Biomed. Anal., 22, p. 189Mohamed, G.G., El-Dien, F.A.T.N., Mohamed, N.A., (2007) Spectrochim. Acta, Part A, 68, p. 1244Greenway, G.M., Dolman, S.J.L., (1999) Analyst, 124, p. 759Ghani, N.T.A., El-Nashar, R., Bioumy, A.A., (2004) J. Pharm. Sci., 29, p. 195El-Nashar, R.M., Ghani, N.T.A., Bioumy, A.A., (2004) Microchem. J., 78, p. 107Ivandini, T.A., Sarada, B.V., Terashima, C., Rao, T.N., Tryk, D.A., Ishiguro, H., Kubota, Y., Fujishima, A., (2002) J. Electroanal. Chem., 521, p. 117Toledo, R.A., Mazo, L.H., Santos, M.C., Honório, K.M., Silva, A.B.F., Cavalheiro, E.T.G., (2005) Quim. Nova, 28, p. 456Ferancová, A., Korgová, E., Buzinkaiová, T., Kutner, W., Stepanek, I., Ján Labuda, J., (2001) Anal. Chim. Acta, 447, p. 47Biryol, I., Uslu, B., Kuçukyavuz, Z., (1996) J. Pharm. Biomed. Anal., 15, p. 371Marco, J.P., Borges, K.B., Tarley, C.R.T., Ribeiro, E.S., Pereira, A.C., (2013) J. Electroanal. Chem., 704, p. 159Eisele, A.P.P., Clausen, D.N., Tarley, C.R.T., Dall'Antonia, L.H., Sartori, E.R., (2013) Electroanalysis, 25, p. 1734Lourencão, B.C., Medeiros, R.A., Rocha-Filho, R.C., Mazo, L.H., Fatibello-Filho, O., (2009) Talanta, 78, p. 748Santos, M.C.G., Tarley, C.R.T., Dall'Antonia, L.H., Sartori, E.R., (2013) Sens. Actuators, B, 188, p. 263Azevedo, A.F., Ferreira, N.G., (2006) Quim. Nova, 1, p. 129Pleskov, Y.V., Russ, J., (2002) Electrochem, 38, p. 1275Compton, R.G., Foord, J.S., Marken, F., (2003) Electroanalysis, 15, p. 1349Swain, G.M., Ramesham, R., (1993) Anal. Chem., 65, p. 345Grigoryants, V.M., Anisimov, O.A., Molin, Y.N., (1982) J. Struct. Chem., 23, p. 327Suffredini, H.B., Pedrosa, V.A., Codognoto, L., Machado, S.A.S., Rocha-Filho, R.C., Avaca, L.A., (2004) Electrochim. Acta, 49, p. 4021Salazar-Banda, G.R., Andrade, L.S., Nascente, P.A.P., Pizani, P.S., Rocha-Filho, R.C., Avaca, L.A., (2006) Electrochim. Acta, 51, p. 4612Vitoreti, A.B.F., Abrahão, O., Gomes, R.A.S., Salazar-Banda, G.R., Oliveira, R.T.S., (2014) Int. J. Electrochem. Sci., 9, p. 1044Lourenção, B.C., Baccarin, M., Medeiros, R.A., Rocha-Filho, R.C., Fatibello-Filho, O., (2013) J. Electroanal. Chem., 707, p. 15Ardila, J.A., Sartori, E.R., Rocha-Filho, R.C., Fatibello-Filho, O., (2013) Talanta, 103, p. 201Bard, A.J., Faulkner, L.R., (2001) Electrochemical Methods: Fundamentals and Applications, , 2nd ed., John Wiley &Sons: New YorkLi, C., (2007) Colloids Surf. B, 55, p. 77Jurva, U., Wikström, H.V., Weidolf, L., Bruins, A.P., (2003) Rapid Commun. Mass Spectrom., 17, p. 800Gosser, D.K., (1994) Cyclic Voltammetry, , VCH: New YorkLong, G.L., Winefordner, J.D., (1983) Anal. Chem., 55, p. 712Duarte, E.H., Santos, W.P., Hudari, F.F., Neto, J.L.B., Sartori, E.R., Dall'Antonia, L.H., Pereira, A.C., Tarley, C.R.T., (2014) Talanta, 127, p. 2
Application Of Ni(ii)-imprinted Cross-linked Poly(methacrylic Acid) Synthesised Through Double-imprinting Method For The On-line Preconcentration Of Ni(ii) Ions In Aqueous Media
No full textThe present paper describes the feasibility of on-line preconcentration of nickel ions from aqueous medium on Ni(II)-imprinted cross-linked poly(methacrylic acid) (IIP) synthesised through a double-imprinting method and their subsequent determination by FAAS. The proposed method consisted in loading the sample (20.0 mL, pH 7.25) through a mini-column packed with 50 mg of the IIP for 2 min. The elution step was performed with 1.0 mol L-1 HNO3 at a flow rate of 7.0 mL min-1. The following parameters were obtained: quantification limit (QL) - 3.74 μg L-1, preconcentration factor (PF) - 36, consumption index (CI) - 0.55 mL, concentration efficiency (CE) - 18 min-1, and sample throughput - 25 h-1. The precision of the procedure assessed in terms of repeatability for ten determinations was 5.6% and 2.5% for respective concentrations of 5.0 and 110.0 μg L-1. Moreover, the analytical curve was obtained in the range of 5.0-180.0 μg L-1 (r = 0.9973), and a 1.64-fold increase in the method sensitivity was observed when compared with the analytical curve constructed for the NIP (non-imprinted polymer), thus suggesting a synergistic effect of the Ni(II) ions and CTAB on the adsorption properties of the IIP. The practical application of the adsorbent was evaluated from an analysis of tap, mineral, lake and river water. Considering the results of addition and recovery experiments (90.2-100 %), the efficiency of this adsorbent can be ensured for the interference-free preconcentration of the Ni(II) ions. © 2014 © 2014 Taylor & Francis.941010611071Singh, D.K., Mishra, S., (2009) Chromatographia, 70, p. 1539Segatelli, M.G., Santos, V.S., Presotto, A.B.T., Yoshida, I.V.P., Tarley, C.R.T., (2010) React. Funct. Polym, 70, p. 325Wu, G., Wang, Z., Wang, J., He, C., (2007) Anal. Chim. Acta, 582, p. 304Oliveira, F.M., Somera, B.F., Ribeiro, E.S., Segatelli, M.G., Yabe, M.J.S., Galunin, E., Tarley, C.R.T., (2013) Ind. Eng. Chem. Res, 52, p. 8550Behbahani, M., Taghizadeh, M., Bagheri, A., Hosseini, H., Salarian, M., Tootoonchi, A., (2012) Microchim Acta, 178, p. 429Krishna, P.G., Gladis, J.M., Rao, T.P., Naidu, G.R., Mol, J., (2005) J. Mol. Recogn, 18, p. 109Ávila, T.C., Segatelli, M.G., Beijo, L.A., Tarley, C.R.T., (2010) Quím. Nova, 33, p. 301Hoffmann, F., Cornelius, M., Morell, J., Fröba, M., (2006) Angew. Chem., Int. Ed, 45, p. 3216Dai, S., Burleigh, M.C., Ju, Y.H., Gao, H.J., Lin, J.S., Pennycook, S.J., Barnes, C.E., Xue, Z.L., (2000) J. Am. Chem. Soc, 122, p. 992Lu, Y.-K., Yan, X.-P., (2004) Anal. Chem, 76, p. 453Nacano, L.R., Segatelli, M.G., Tarley, C.R.T., (2010) J. Braz. Chem. Soc, 21, p. 419Dai, S., (2001) Chemistry, 7, p. 763Oliveira, F.M., Somera, B.F., Corazza, M.Z., Yabe, M.J.S., Segatelli, M.G., Ribeiro, E.S., Lima, E., Tarley, C.R.T., (2011) Talanta, 85, p. 2417Tarley, C.R.T., Barbosa, A.F., Segatelli, M.G., Figueiredo, E.C., Luccas, P.O., (2006) J. Anal. At. Spectrom, 21, p. 1305Pearson, R.G., (1963) J. Am. Chem. Soc, 85, p. 3533Long, G.L., Voigtman, E.G., Kosinski, M.A., Winefordner, J.D., (1983) Anal. Chem, 55, p. 1432Lata, H., Garg, V.K., Gupta, R.K., (2008) J. Hazard. Mat, 157, p. 503Duran, C., Senturk, H.B., Elci, L., Soylak, M., Tufekci, M., (2009) J. Hazard. Mat, 162, p. 292(2013) Directory 357 from the National Brazilian Environmental Council, Fed. Off. J, , www.mma.gov.br/port/conama/legiabre.cfm?codlege=459Shokrolahi, A., Ghaedi, M., Shabani, R., Montazerozohori, M., Chehreh, F., Soylak, M., Alipour, S., (2010) Food Chem. Toxicol, 48, p. 482Ciftci, H., Yalcin, H., Eren, E., Olcucu, A., Sekerci, M., (2010) Desalination, 256, p. 48Amais, R.S., Ribeiro, J.S., Segatelli, M.G., Yoshida, I.V.P., Luccas, P., Tarley, C., (2007) Separation and Purification Technology, 58, p. 122Jiang, N., Chang, X., Zheng, H., He, Q., Hu, Z., (2006) Anal. Chim. Acta, 577, p. 225Praveen, R.S., Daniel, S., Prasada, R.T., (2005) Talanta, 66, p. 513Ali, A., Ye, Y., Xu, G., Yin, X., Zhang, T., (1999) Microchem. J, 63, p. 365de Alcântara, I.L., Roldan, P.S., Margionte, M.A.L., Castro, G.R., Padilha, C.C.F., Florentino, A.O., Padilha, P.M., (2004) J. Braz. Chem. Soc, 15, p. 36
Carbon Nanotube Based Sensor For Simultaneous Determination Of Acetaminophen And Ascorbic Acid Exploiting Multiple Response Optimization And Measures In The Presence Of Surfactant
No full textA simple procedure for the simultaneous determination of acetaminophen (AC) and ascorbic acid (AA) by differential pulse voltammetry (DPV) using a carbon nanotube paste electrode exploiting measures in cetylpyridinium bromide (CPB) medium is described. Under the best instrumental parameters of DPV, optimized by means of factorial design, the calibration plots in the range 100.0-700.0μmolL-1 (r=0.993) and 39.4-146.3μmolL-1 (r=0.995) with limits of detection of 7.1 and 2.1μmolL-1, were achieved for AA and AC, respectively. The developed method was successfully applied for the AC and AA determination in pharmaceutical formulations, whose accuracy was attested by comparison with HPLC method. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.241222912301Goyal, R.N., Singh, S.P., (2006) Electrochim. Acta, 51, p. 3008Fan, Y., Liu, J.-H., Lu, H.-T., Zhang, Q., (2011) Colloids Surf. B, 85, p. 289Özcan, L., Şahin, Y.S., (2007) Sens. Actuators B, 127, p. 362Goyal, R.N., Gupta, V.K., Oyama, M., Bachheti, N., (2005) Electrochem. Commun., 7, p. 803Kachoosangi, R.T., Wildgoose, G.G., Compton, R.G., (2008) Anal. Chim. Acta, 618, p. 54Shankaran, D.R., Iimura, K., Kato, T., (2003) Sens. Actuators B, 94, p. 73Padayatty, S.J., Katz, A., Wang, Y., Eck, P., Kwon, O., Lee, J.-H., Chen, S., Levine, M., (2003) J. Am. Coll. Nutr., 22, p. 18Tsvetkova, B., Pencheva, I., Zlatkov, A., Peikov, P., (2012) Afr. J. Pharm. Pharmacol., 6, p. 1332Sarakbi, A., Aydogmus, Z., Sidali, T., Gokce, G., Kauffamann, J., (2011) Electroanalysis, 23, p. 29Atta, N.F., El-Kady, M.F., (2009) Talanta, 79, p. 639Nair, S.S., John, S.A., Sagara, T., (2009) Electrochim. Acta, 54, p. 6837Atta, N.F., El-Kady, M.F., Galal, A., (2010) Anal. Biochem., 400, p. 78DosSantos, W.T.P., DeAlmeira, E.G.N., Ferreira, H.E.A., Gimenes, D.T., Richter, E.M., (2008) Electroanalysis, 20, p. 1878Rodovan, C., Cofan, C., Cinghita, D., (2008) Electroanalysis, 20, p. 1353Cofan, C., Rodavan, C., (2008) Sensor, 8, p. 3952Jacobs, C.B., Peairs, M.J., Venton, B.J., (2010) Anal. Chim. Acta, 662, p. 105Agüí, L., Yáñez-Sedeño, P., Pingaron, J.M., (2008) Anal. Chim. Acta, 622, p. 11Ionescu, M.I., Zhang, Y., Li, R., Sun, X., Abou-Rachid, H., Lussier, L.S., (2011) Appl. Surf. Sci., (6843), p. 257Menezes, V.M.D., Rocha, A.R., Zanella, I., Mota, R., Fazzio, A., Fagan, S.B., (2011) Chem. Phys. Lett., (233), p. 506Sharokhian, S., Asadian, E., (2010) Electrochim. Acta, 55, p. 666Ensafi, A.A., Karimi-Maleh, H., Mallakpour, S., (2012) Electroanalysis, 24, p. 666Habibi, B., Jahanbakhshi, M., Pournaghi-Azar, M.H., (2011) Anal. Biochem., 411, p. 167P.R. Dalmasso, M.L. Pedano, G.A. Rivas, Sens. Actuators B 2012, 173, 732Havens, N., Trihn, P., Kim, D., Luna, M., Wanekaya, A.K., Mugweru, A., (2010) Electrochim. Acta, 55, p. 2186Juan, P., Zuo-Ning, G., (2006) Anal. Bioanal. Chem., 384, p. 1525DosReis, A.P., Tarley, C.R.T., Kubota, L.T., (2005) Talanta, 67, p. 829DosReis, A.P., Tarley, C.R.T., Mello, L.D., Kubota, L.T., (2008) Anal. Sci., 24, p. 1569DosReis, A.P., Tarley, C.R.T., Kubota, L.T., (2008) J. Braz. Chem. Soc., 19, p. 1567Jain, R., Rather, J.A., (2011) Colloids Surf. B, 83, p. 340Wen, X.-L., Jia, Y.-H., Liu, Z.-L., (1999) Talanta, 50, p. 1027Atta, N.F., Darwish, S.A., Khalil, S.E., Galal, A., (2007) Talanta, 72, p. 1438Li, C., (2007) Colloids Surf. B, 55, p. 77Wang, X.-G., Wu, Q.-S., Liu, W.-Z., Ding, Y.-P., (2006) Electrochim. Acta, 52, p. 589Tarley, C.R.T., Silveira, G., DosSantos, W.N., Matos, G.D., DaSilva, E.G., Bezerra, M.A., Miro, M., Ferreira, S.L., (2009) Microchem. J., 92, p. 58Korany, M.A., Fahmy, O.T., Mahgoub, H., Maher, H.M., (2011) J. Adv. Res., 2, p. 121Santos, V.S., Santos, W.J.R., Kubota, L.T., Tarley, C.R.T., (2009) J. Pharm. Biomed. Anal., 50, p. 151Derringer, G., Suich, R., (1980) J. Quality Technol., 12, p. 214Goyal, R.N., Gupta, V.K., Chatterjee, S., (2010) Sens. Actuators B, 149, p. 252Weast, R.C., (1984) CRC Handbook of Chemistry and Physics, , CRC Press, FloridaLiu, L., Zhao, F., Xiao, F., Zeng, B., (2009) Int. J. Electrochem. Sci., 4, p. 525Bard, A.J., Faulkner, L.R., (2001) Electrochemical Methods, Fundamentals and Applications, , Wiley, New YorkB.B. Neto, I.S. Scarminio, R.E. Bruns, Como Fazer Experimentos: Pesquisa e Desenvolvimento na Ciência e na Indústria, Bookman, Porto Alegre 2010Long, G.L., Winefordner, J.D., (1983) Anal. Chem., 55, p. 71
Flow-based Method For Epinephrine Determination Using A Solid Reactor Based On Molecularly Imprinted Poly(fepp-maa-egdma)
No full textA solid phase reactor based on molecularly imprinted poly(iron (III) protoporphyrin-methacrylic acid-ethylene glycol dimethacrylate) (MIP-MAA) has been synthesized by bulk method and applied as an selective material for the epinephrine determination in the presence of hydrogen peroxide. In order to prove the selective behaviour of MIP, two blank polymers named non-imprinted polymer (NIP1), non-imprinted polymer in the absence of hemin (NIP2) as well as a poly(iron (III) protoporphyrin-4-vynilpyridine-ethylene glycol dimethacrylate) (MIP-4VPy) were synthesized. The epinephrine-selective MIP-MAA reactor was used in a flow injection system, in which an epinephrine solution (120 μL) at pH 8.0 percolates in the presence of hydrogen peroxide (300 μmol L - 1) through MIP-MAA. The oxidation of epinephrine by hydrogen peroxide is increased by using MIP-MAA, being the product formed monitored by amperometry at 0.0 V vs. Ag/AgCl. The MIP-MAA showed better selective behaviour than NIP1, NIP2 and MIP-4VPy, demonstrating the effectiveness of molecular imprinting effect. Highly improved response was observed for epinephrine in detriment of similar substances (phenol, ascorbic acid, methyl-l-DOPA, p-aminophenol, catechol, l-DOPA and guaiacol). The method provided a calibration curve ranging from 10 to 500 μmol L- 1 and a limit of detection of 5.2 μmol L- 1. Kinetic data indicated a value of maximum rate Vmax (0.993 μA) and apparent Michaelis-Menten constant of K m app(725.6 μmol L- 1). The feasibility of biomimetic solid reactor was attested by its successful application for epinephrine determination in pharmaceutical formulation. © 2010 Elsevier B.V. All rights reserved.312114119Pauling, L., (1940) J. Am. Chem. Soc., 62, p. 2643Dickey, F.H., (1949) Proc. Natl. Acad. Sci., 35, p. 227Wulff, G., Sarhan, A., (1972) Angewan. Chem., 84, p. 364Qiao, F., Sun, H., Yan, H., Row, K.H., (2006) Chromatographia, 64, p. 625Dias, A.C.B., Figueiredo, E.C., Grassi, V., Zagatto, E.A.G., Arruda, M.A.Z., (2008) Talanta, 76, p. 988Yang, M., Li, Y., (2004) Anal. Lett., 37, p. 2043Tarley, C.R.T., Sotomayor, M.D.P.T., Kubota, L.T., (2005) Quim. Nova, 28, p. 1087Baggiani, C., Anfossi, L., Giovannoli, C., (2006) Current Pharm. Anal., 2, p. 219Rathbone, D.L., (2005) Adv. Drug Deliv. Rev., 57, p. 1854Alexander, C., Andersson, H.S., Andersson, L.I., Ansell, R.J., Kirsch, N., Nicholls, I.A., O'Mahony, J., Whitcombe, M.J., (2006) J. Mol. Recognit., 19, p. 106Brüggemann, O., (2001) Anal. Chim. Acta, 435, p. 197Say, R., Erdem, M., Ersoz, A., Turk, H., Denizli, A., (2005) Appl. Catal. A: General, 286, p. 221Motherwell, W.B., Bingham, M.J., Six, Y., (2001) Tetrahedron, 57, p. 4663Santos, W.J.R., Lima, P.R., Tarley, C.R.T., Kubota, L.T., (2009) J. Braz. Chem. Soc., 20, p. 820Amao, Y., (2003) Microchim. Acta, 143, p. 1Deng, X., Zhang, D., Wang, X., Yuan, X., Ma, Z., (2008) Chin. J. Catal., 29, p. 519Sotomayor, M.D.P.T., Tanaka, A.A., Kubota, L.T., (2002) Anal. Chim. Acta, 455, p. 215Cheng, Z., Li, Y., (2006) J. Mol. Catal. A: Chem., 256, p. 9Santos, W.J.R., Lima, P.R., Tarley, C.R.T., Hoehr, N.F., Kubota, L.T., (2009) Anal. Chim. Acta, 31, p. 170Santos, W.J.R., Lima, P.R., Tarley, C.R.T., Kubota, L.T., (2007) Anal. Bioanal. Chem., 389, p. 1919Mello, L.D., Sotomayor, M.D.P.T., Kubota, L.T., (2003) Sens. Act B, 96, p. 636Corona-Avendaño, S., Alarcón-Angeles, G., Rojas-Hernández, A., Romero-Romo, M.A., Ramírez-Silva, M.T., (2005) Spectrochim. Acta, Part A, 61, p. 305Long, G.L., Winefordner, J.D., (1983) Anal. Chem., 55, p. 712The United States Pharmacopeia-The National Formulary-USP-30 NF-25, 2007Wang, G., Xu, J., Chen, H., Lu, Z., (2003) Biosens. Bioelectron., 18, p. 335Kumar, N., Tripathi, D.R., (1999) Plant Peroxidase Newsl., 15, p. 45Xiao, Y., Ju, H.X., Chen, H.Y., (2000) Anal. Biochem., 22, p. 278Ju, H.X., Liu, S.Q., Ge, B., Lisdat, F., Scheller, F.W., (2002) Electroanalysis, 14, p. 141Liu, S.Q., Ju, H.X., (2002) Anal. Biochem., 307, p. 11
Preparation Of Sio2/nb2o5/zno Mixed Oxide By Sol-gel Method And Its Application For Adsorption Studies And On-line Preconcentration Of Cobalt Ions From Aqueous Medium
No full textA new Nb2O5/ZnO mixed oxide dispersed in a silica matrix (i.e., SiO2/Nb2O5/ZnO) was synthesized via sol-gel method and used as an adsorbent of cobalt ions (Co2+). The material presented a high surface area (323m2g-1) and the maximum adsorption capacity was found to be 0.518mgg-1, determined from the non-linear Langmuir-Freundlich isotherm model. The material was used as a chelating agent free-solid phase extractor (CAF-SPE) in an on-line preconcentration procedure, based on the adsorption of Co2+ ions (16.0mL, pH 7.4) at a high flow rate (8.0mLmin-1) onto a mini-column packed with the adsorbent (200mg). The analyte was then eluted with 1.0molL-1 HCl and transported toward the FAAS detector. Linear calibration range was obtained from 0.96 up to 150.0μgL-1, with a limit of detection of 0.28μgL-1. The precision of method, estimated as relative standard deviation of ten replicate measurements of 30 and 150μgL-1 analyte solutions, was found to be 4.6% and 3.1%, respectively. The reliability of method was verified through the analysis of water and food samples and the accuracy was confirmed by using a certified reference material. © 2013 Elsevier B.V.239233241Alibabic, V., Vahcic, N., Bajramovic, M., Bioaccumulation of metals in fish of salmonidae family and the impact on fish meat quality (2007) Environ. Monit. Assess., 131, pp. 349-364Ahmed, M.J., Uddin, M.N., A simple spectrophotometric method for the determination of cobalt in industrial, environmental, biological and soil samples using bis(salicylaldehyde)orthophenylenediamine (2007) Chemosphere, 67, pp. 2020-2027Souza, J.M.O., Tarley, C.R.T., Sorbent separation and enrichment method for cobalt ions determination by graphite furnace atomic absorption spectrometry in water and urine samples using multiwall carbon nanotubes (2009) Int. J. Environ. Anal. 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Synthesis Of Novel Copper Ion-selective Material Based On Hierarchically Imprinted Cross-linked Poly(acrylamide-co-ethylene Glycol Dimethacrylate)
No full textA novel hierarchically imprinted cross-linked poly(acrylamide-co-ethylene glycol dimethacrylate) using a double-imprinting approach for the Cu 2+ selective separation from aqueous medium was prepared. In the imprinting process, both Cu2+ ions and surfactant micelles (cetyltrimethylammonium bromide - CTAB) were employed as templates. The hierarchically imprinted organic polymer named (IIP-CTAB), single-imprinted (IIP-no CTAB) and non-imprinted (NIP-CTAB and NIP-no CTAB) polymers were characterized by SEM, FTIR, TG, elemental analysis and textural data from BET (Brunauer-Emmett-Teller) and BJH (Barrett-Joyner-Halenda). Compared to these materials, IIP-CTAB showed higher selectivity, specific surface area and adsorption capacity toward Cu2+ ions. Good selectivity for Cu 2+ was obtained for the Cu2+/Cd2+, Cu 2+/Zn2+ and Cu2+/Co2+ systems when IIP-CTAB was compared to the single-imprinted (IIP-no CTAB) and non double-imprinted polymer (NIP-CTAB), thereby confirming the improvement in the polymer selectivity due to double-imprinting effect. For adsorption kinetic data, the best fit was provided with the pseudo-second-order model for the four materials, thereby indicating the chemical nature of the Cu2+ adsorption process. Cu2+ adsorption under equilibrium was found to follow dual-site Langmuir-Freundlich model isotherm, thus suggesting the existence of adsorption sites with low and high binding energy on the adsorbent surface. From column experiments 600 adsorption-desorption cycles using 1.8 mol L-1 HNO3 as eluent confirmed the great recoverability of adsorbent. 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Evaluation Of Poly(vinylpyridine)-supported Protoporphyrin Resin For The Sampling/separation Of Manganese(ii) Using A Hyphenated Fia-faas System
No full textThe present study describes the development of a preconcentration method for manganese determination by FAAS using poly(protoporphyrin-co-vinylpyridine) as a sorbent. To synthesize this material, 4-vinylpyridine and protoporphyrin were copolymerized in the presence of ethylene glycol dimethacrylate as a cross-linker and 2,2-azobisisobutyronitrile as an initiator. The factors affecting the flow injection preconcentration system were optimized by employing 25 fractional factorial and Doehlert matrix designs. The proposed on-line preconcentration method was performed by percolating 18.0 mL aliquots of Mn(ii) solutions (pH 8.3) at a flow rate of 6.0 mL min-1 through a mini-column, packed with 100 mg of poly(protoporphyrin-co-vinylpyridine); the Mn(ii) ions were then on-line eluted with 1.5 mol L-1 HNO3 into the FAAS nebulizer. Under these conditions, it was possible to yield a linear curve in the concentration range of 0.0-120.0 μg L-1, with a correlation coefficient of 0.997. Besides, the following system parameters were obtained: sampling frequency of 15 h-1, preconcentration factor of 53, consumptive index of 0.34 mL, concentration efficiency of 17.6 min -1, detection limit of 0.34 μg L-1, and quantification limit of 1.13 μg L-1. The method precision (repeatability) estimated for ten measurements of 1.0 and 50.0 μg L-1 Mn(ii) standard solutions was found to be 5.2 and 4.9%, respectively. Moreover, the protoporphyrin incorporation into the poly(vinylpyridine) network caused a remarkable 323% increase in the method's sensitivity. Finally, the proposed procedure was not affected by potentially interfering ions. Thus, it was successfully applied to the Mn(ii) determination in water, food and sediment samples. This journal is © The Royal Society of Chemistry 2013.51332643271Pereira, M.G., Arruda, M.A.Z., (2003) Microchim. Acta, 141, pp. 115-131Dai, S., Burleigh, M.C., Ju, Y.H., Gao, H.J., Sin, J.S., Pennycook, S.J., Barnes, C.E., Xue, Z.L., (2000) J. Am. 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Analytical Performance Of New Mixed Oxide (sio2/tio2/zno)-based Sorbent For Development Of A Reliable Mechanized Enrichment System For Copper Determination In Water And Food Samples
No full textIn the present study, a new composite material (SiO2/TiO2/ZnO) for copper preconcentration in water and food samples was evaluated. The sorbent was characterized by scanning electronic microscopy (SEM), Fourier transform infrared spectrophotometry (FT-IR), textural data analyses, energy dispersive X-ray fluorescence (EDXRF) and X-ray diffractometry (XRD). The on-line preconcentration and visible spectrophotometric determination was based on loading 20.0 mL of sample at pH 7.0 through 50 mg of sorbent at a flow rate of 6.4 mL min-1. A fixed volume of 0.3 mL of 0.5 mol L-1 HNO3 elutes copper ions, in which react with 0.3% (m/m) diethyldithiocarbamate (DDTC) whose complex formed (Cu(DDTC)2) is monitored at 452 nm. The selectivity of sorbent has been examined by assessing the effect of interfering ions. The proposed method provided linearity ranging from 20.0 to 230.0 μg L-1 (r = 0.998), preconcentration factor of 35.9 and limit of detection of 5.6 μg L-1. Water and food samples were successfully analyzed by proposed method and the accuracy was checked by analysis of certified reference materials of protein and liver of fish.251120542062Kendüzler, E., Türker, A.R., (2003) Anal. Chim. Acta, 480, p. 259Kurukan, I., Çahin, C.A., Çatiroʇlu, N., Bektaç, S., (2011) Microchem. J., 99, p. 159Roberts, E.A., Schilsky, M.L., (2003) Hepatology, 37, p. 1475Escudero, L.A., Cerutti, S., Olsina, R.A., Salonia, J.A., Gasquez, J., (2010) J. Hazard. Mater., 183, p. 218Tokman, N., (2007) J. Hazard. Mater., 143, p. 87http://water.epa.gov/drink/contaminants/, accessed in August 2014http://ec.europa.eu/environment/water/water-drink, accessed in August 2014http://bvsms.saude.gov.br/bvs/saudelegis/gm/2011/anexo/anexo_prt2914_12_12_2011.pdf, accessed in August, 2014Ferreira, S.L.C., Bezerra, M.A., Santos, W.N.L., Neto, B.B., (2003) Talanta, 61, p. 295Wang, J., Hansen, E.H., (2000) Anal. Chim. Acta., 424, p. 223Hasan, C., Bekir, B., (2002) Turk. J. Chem., 26, p. 599Hoshi, S., Tanaka, Y., Inoue, S., Matsubara, M., (1989) Anal. Sci., 5, p. 471Lima, G.F., Souza, P.M.J., Segatelli, M.G., Luccas, P.O., Tarley, C.R.T., (2010) Environanotechnology, , Fan, M.Huang, C.Bland, A. E.Wang, Z.Slimane, R.Wright, I., eds.Elsevier: Amstersdam ch. 9Brasil, J.L., Martins, L.C., Ev, R.R., Dupont, J., Dias, S.L.P., Sales, J.A.A., Airoldi, C., Lima, E.C., (2005) Int. J. Environ. Anal. Chem., 85, p. 475De Moraes, S.V.M., Brasil, J.L., Milcharek, C.D., Martins, L.C., Laranjo, M.T., Gallas, M.R., Benvenutti, E.V., Lima, E.C., (2005) Spectrochim. Acta, Part A, 62, p. 398Ávila, T.C., Segatelli, M.G., Beijo, L.A., Tarley, C.R.T., (2010) Quim. Nova, 33, p. 301Boyaci, E., Çaʇir, A., Shahwan, T., Eroʇlu, A.E., (2011) Talanta, 85, p. 1517Da Silva, E.L., Martins, A.O., Valentini, A., Fávere, V.T., Carasek, E., (2004) Talanta, 64, p. 181Yu, H., Song, H., Chen, M., (2011) Talanta, 85, p. 625Tarley, C.R.T., Fernandes, F.F., Luccas, P.O., Segatelli, M.G., (2011) Anal. Lett., 44, p. 216Budziak, D., Da Silva, E.L., De Campos, S.D., Carasek, E., (2003) Microchim. Acta, 141, p. 169Liu, Y., Liang, P., Guo, L., (2005) Talanta, 68, p. 25Lima, G.F., Ohara, M.O., Clausen, D.N., Nascimento, D.R., Ribeiro, E.S., Segatelli, M.G., Bezerra, M.A., Tarley, C.R.T., (2012) Microchim. Acta, 178, p. 61Costa, L.M., Ribeiro, E.S., Segatelli, M.G., Nascimento, D.R., Oliveira, F.M., Tarley, C.R.T., (2011) Spectrochim. Acta, Part B, 66, p. 329Diniz, K.M., Gorla, F.A., Ribeiro, E.S., Do Nascimento, M.B.O., Corrêa, R.J., Tarley, C.R.T., Segatelli, M.G., (2014) Chem. Eng. J., 239, p. 233Lima, G.F., Ferreira, V.S., Godoy, N.V., Medeiros, R.F., Garrido, F.M.S., Ribeiro, E.S., Nakagaki, S., Tarley, C.R.T., (2013) Microchem. J., 109, p. 98Liu, R., Liang, P., (2008) J. Hazard. Mater., 152, p. 166Vu, D., Li, Z., Zhang, H., Wang, W., Wang, Z., Xu, X., Dong, B., Wang, C., (2012) J. Colloid Interface Sci., 367, p. 429Khan, S.B., Rahman, M.M., Marwani, H.M., Asiri, A.M., Alamry, K.A., (2013) Nanoscale Res. Lett., 8, p. 377Zhang, H., Qiao, Y., Zhang, X., Fang, S., (2010) J. Non-Cryst. Solids, 356, p. 879Lee, S.W., Condrate, R.A., Sr., (1988) J. Mater. Sci., 23, p. 2951Pearson, R.G., (1963) J. Am. Chem. Soc., 85, p. 3533Kabil, M.A., Ghazy, S.E., Lasheen, M.R., Shallaby, M.A., Amar, N.S., (1996) Fresenius' J. Anal. Chem., 354, p. 371Uddin, M.N., Salam, M.A., Hossain, M.A., (2013) Chemosphere, 90, p. 366IUPAC, (1978) Spectrochim. Acta, Part B, 33, p. 241Yamini, Y., Tamaddon, A., (1999) Talanta, 49, p. 119Castilho, E., Cortina, J., Beltrán, J., Prat, M., Granados, M., (2001) Analyst, 126, p. 1149Lee, T., Choi, H., (2002) Bull. Korean Chem. Soc., 23, p. 861Lemos, V.A., Vieira, D.R., Novaes, C.G., Rocha, M.E., Santos, M.S., Yamaki, R.T., (2006) Microchim. Acta, 153, p. 19
Cloud Point Extraction/preconcentration Of Copper Ions Exploiting The Formation Of Complexes With Dmit [4,5-dimercapto-1,3-dithyol-2-thionate] [extração/pré-concentração De íons Cobre No Ponto Nuvem Explorando A Formação De Complexos Com Dmit [4,5-dimercapto-1,3-ditiol-2-tionato]]
No full textThe present study proposes a method for cloud point preconcentration of copper ions at pH 2.0 based on complexes formed with [4,5-dimercapto-1,3- dithyol-2-thionate] and subsequent determination by flame atomic absorption spectrometry (FAAS). Under optimal analytical conditions, the method provided limits of detection of 0.84 and 0.45 mg L-1, by preconcentrating 12.0 and 24.0 mL of sample, respectively. The method was applied for copper determination in water samples, synthetic saliva, guarana powder, tea samples and soft drinks and the accuracy was assessed by analyzing the certified reference materials Dogfish Liver (DOLT-4) and Lobster Hepatopancreas (TORT-2).35816001605Nascentes, C.C., Arruda, M.A.Z., Maniasso, N., (2002) Quim. Nova, 25, p. 483Bezerra, M.A., Ferreira, S.L.C., (2006) Extração em Ponto Nuvem: Princípios e Aplicações e Química Analítica, , 1a ed., Edições UESB: Vitória da ConquistaSussulini, A., Arruda, M.A.Z., (2006) Eclet. Química, 31, p. 73Wang, L., Cai, Y., He, B., Yuan, C., Shen, D., Shao, J., Jiang, G., (2006) Talanta, 70, p. 47Paleólogos, E.K., Giokas, D.L., Karayannis, M.I., (2005) Trends Anal. Chem., 24, p. 426Bezerra, M.D., Arruda, M.A.Z., Ferreira, S.L.C., (2005) Appl. Spectrosc. Rev., 40, p. 269Citak, D., Tuzen, M., (2010) Food Chem. Toxicol., 48, p. 1399Ghaedi, M., Shokrollahi, A., Ahmadi, F., Rajabi, H.R., Soylak, M., (2008) J. Hazard. Mater., 150, p. 533Satiroglu, N., Arpa, C., (2008) Microchim. Acta, 162, p. 107Lemos, V.A., Santos, M.S., David, G.T., Maciel, M.V., Bezerra, M.A., (2008) J. Hazard. Mater., 159, p. 245Ghaedi, M., Shokrollahi, A., Niknam, K., Nikam, E., Najibi, A., Soylak, M., (2009) J. Hazard. Mater., 168, p. 1022Bezerra, M.A., Bruns, R.E., Ferreira, S.L.C., (2006) Anal. Chim. Acta, 580, p. 251Lemos, V.A., Santos, M.S., Dos Santos, J.S., Vieira, D.R., Novaes, C.G., (2007) Microchim. Acta, 157, p. 215Silva, E.L., Roldan, P.S., Giné, M.F., (2009) J. Hazard. Mater., 171, p. 1133Kolachi, N.F., Kazi, T.G., Khan, S., Wadhwa, S.K., Baig, J.A., Afridi, H.I., Shah, A.Q., Shah, F., (2011) Food Chem. Toxicol., 49, p. 2548Chen, J., Teo, K.C., (2001) Anal. Chim. Acta, 450, p. 215Amais, R.S., Tarley, C.R.T., (2008) Can. J. Anal. Sci. Spectrosc., 53, p. 130Souza, J.M.O., Tarley, C.R.T., (2008) Anal. Lett., 41, p. 2465Barreto, W.J., Ribeiro, M.C.C., Santos, P.S., (1992) J. Mol. Struct., 269, p. 7584Barreto, W.J., Barreto, S.R.G., Ruiz, L.D., Ishikawa, D.N., Scarmínio, I.S., (2005) Anal. Sci., 21, p. 549Barreto, S.R.G., Nozaki, J., Barreto, W.J., (1999) Microchem. J., 62, p. 223Sargentelli, V., Mauro, A.E., Massabni, A.C., (1996) Quim. Nova, 19, p. 290Khairy, M., Kadara, R.O., Kampouris, D.K., Banks, C.E., (2010) Anal. Methods, 2, p. 645Oliveira, F.M., Somera, B.F., Corazza, M.Z., Segatelli, M.G., Ribeiro, E.S., Lima, E.C., Dias, S.L.P., Tarley, C.R.T., (2011) Talanta, 85, p. 2417Barros Neto, B., Scarmínio, I.S., Bruns, R.E., (1996) Planejamento e Otimização de Experimentos, , 2a ed., Editora Unicamp: CampinasRalph, G.P., (1963) J. Am. Chem. Soc., 85, p. 3533Long, G.L., Winefordner, J.D., (1983) Anal. Chem., 55, p. 712Watanabe, K., Tanaka, T., Shigeni, T., Hayashida, Y., Maki, K., (2009) J. Trace Elem. Med. Biol., 23, p. 93Hong, J.E., Duncan, S.E., Dietrich, A.M., O'Keefe, S.F., Eigel, W.N., Mallikarjunan, K., (2009) J. Agric. Food Chem., 57, p. 6967Harris, D.C., (2005) Análise Química Quantitativa, , 6a ed., LTC-Livros Técnicos e Científicos Ed. S. A.: Rio de JaneiroKulichenko, S.A., Doroschuk, V.O., Lelyshok, S.O., (2003) Talanta, 59, p. 767Shokrollajo, A., Ghaedi, M., Hossaini, O., Khanjari, N., Soylak, M., (2008) J. Hazard. Mat., 160, p. 435Gao, Y., Wu, P., Li, W., Xuan, Y., Hou, X., (2010) Talanta, 81, p. 58
Ion Imprinted Polymers: Fundamentals, Preparation Strategies And Applications In Analytical Chemistry [polímeros Impressos Com íons: Fundamentos, Estratégias De Preparo E Aplicações Em Química Analítica]
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