1,720,984 research outputs found
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
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
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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Polym., 73, pp. 838-846Kursunlu, A.N., Guler, E., Dumrul, H., Kocyigit, O., Gubbuk, I.H., Chemical modification of silica gel with synthesized new Schiff base derivatives and sorption studies of cobalt (II) and nickel (II) (2009) Appl. Surf. Sci., 255, pp. 8798-8803Dumrul, H., Kursunlu, A.N., Kocyigit, O., Guler, E., Ertul, S., Adsorptive removal of Cu(II) and Ni(II) ions from aqueous media by chemical immobilization of three different aldehydes (2011) Desalination, 271, pp. 92-99Yalçinkaya, O., Kalfa, O.M., Türker, A.R., Chelating agent free-solid phase extraction (CAF-SPE) of Co(II), Cu(II) and Cd(II) by new nano hybrid material (ZrO2/B2O3) (2011) J. Hazard. 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J., 221, pp. 275-282Xiong, C., Jia, Q., Chen, X., Wang, G., Yao, C., Optimization of polyacrylonitrile-2-aminothiazole resin synthesis, characterization, and its adsorption performance and mechanism for removal of Hg(II) from aqueous solutions (2013) Ind. Eng. Chem. Res., 52, pp. 4978-4986Xiong, C., Chen, X., Liu, X., Synthesis, characterization and application of ethylenediamine functionalized chelating resin for copper preconcentration in tea samples (2012) Chem. Eng. J., 203, pp. 115-122Xiong, C., Pi, L., Chen, W., Yang, L., Ma, C., Zheng, X., Adsorption behavior of Hg2+ in aqueous solutions on a novel chelating cross-linked chitosan microsphere (2013) Carbohyd. 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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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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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Kinetic And Isotherm Studies Of Ni2+adsorption On Poly(methacrylic Acid) Synthesized Through A Hierarchical Double-imprinting Method Using A Ni2+ Ion And Cationic Surfactant As Templates
No full textA novel poly(methacrylic acid) material (IIP/CTAB) was prepared by a hierarchical double-imprinting process with Ni2+ ion and cationic surfactant - cetyltrimethylammonium bromide (CTAB) as templates, and it was employed to adsorb Ni2+ ions from aqueous medium. Other poly(methacrylic acid) materials - single-imprinted (IIP/no CTAB) and nonimprinted (NIP/no CTAB) were investigated in adsorption studies. All the synthesized polymers were characterized by FTIR, SEM, and nitrogen adsorption-desorption isotherm. The maximum Ni2+ adsorption capacities of IIP/CTAB and NIP/no CTAB were found to be 33.31 and 18.64 mg g-1, respectively, at pH 7.25. The relative selectivity coefficient (k′) values for Ni2+/Cu2+, Ni2+/Mn +, Ni2+/Co2+ and Ni2+/Pb 2+ systems were higher than 1, thus confirming the significant improvement in the selectivity of the polymer. The kinetic data were described very well by the pseudo-second-order model, thereby confirming the chemical nature of the Ni2+ adsorption (chemisorption), whereas the dual-site Langmuir-Freundlich equation provided the best fit to the isotherm data, suggesting the existence of two kinds of adsorption sites (with low and high binding energies) on the polymer surface. The high chemical stability of IIP/CTAB was verified with 300 Ni2+ adsorption-desorption cycles using 1.0 mol L-1 HNO3 as stripping agent. © 2013 American Chemical Society.522585508557Cempel, M., Nikel, G., Nickel: A Review of Its Sources and Environmental Toxicology (2006) Polish J. Environ. Stud., 15, p. 375Yebra, M.C., Cancela, S., Cespón, R.M., Automatic Determination of Nickel in Foods by Flame Atomic Absorption Spectrometry (2008) Food Chem., 108, p. 774Denkhaus, E., Salnikow, K., Nickel Essentiality, Toxicity and Carcinogenicity (2002) Crit. Rev. Oncol. 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Acta, 582, p. 304Nacano, L.R., Segatelli, M.G., Tarley, C.R.T., Selective Sorbent Enrichment of Nickel Ions from Aqueous Solutions Using a Hierarchically Hybrid Organic-Inorganic Polymer Based on Double Imprinting Concept (2010) J. Braz. Chem. Soc., 21, p. 419Barbosa, A.F., Segatelli, M.G., Pereira, A.C., Santos, A.S., Kubota, L.T., Luccas, P.O., Tarley, C.R.T., Solid-Phase Extraction System for Pb (II) Ions Enrichment Based on Multiwall Carbon Nanotubes Coupled On-Line to Flame Atomic Absorption Spectrometry (2007) Talanta, 71, p. 1512Singh, D.K., Mishra, S., Synthesis, Characterization and Analytical Applications of Ni(II)-ion imprinted polymer (2010) Appl. Surf. Sci., 256, p. 7632Tarley, C.R.T., Andrade, F.N., Santana, H., Zaia, D.A.M., Beijo, L.A., Segatelli, M.G., Ion-Imprinted Polyvinylimidazole-Silica Hybrid Copolymer for Selective Extraction of Pb (II): Characterization and Metal Adsorption Kinetic and Thermodynamic Studies (2012) React. Funct. 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3-mercaptopropyltrimethoxysilane-modified Multi-walled Carbon Nanotubes As A New Functional Adsorbent For Flow Injection Extraction Of Pb(ii) From Water And Sediment Samples
No full textIn the present study, a novel synthesized adsorbent material based on 3-mercaptopropyltrimethoxysilanefunctionalized multi-walled carbon nanotubes was used to increase the Pb2+ adsorption from aqueous solutions in a flow injection solid-phase extraction system coupled to flame atomic absorption spectrometry. Spectroscopic and microscopic techniques (Fourier transform infrared spectroscopy, energy dispersive spectroscopy, and scanning electronmicroscopy) were employed to confirm the chemical modification of the adsorbent surface. Preconcentration conditions (sample pH, flow rate, buffer solution, and eluent concentrations) were optimized using factorial and Doehlert matrix designs that made it possible to construct a linear graph in the 5.0- to 130.0-μgL-1 range (r0 0.9999) and estimate detection and quantification limits (1.7 and 5.7 μgL-1, respectively). The method precision was found to be 4.20 and 1.97%for 5.0 and 100.0 μgL -1 Pb2+ solutions, respectively. When using the 3-mercaptopropyltrimethoxysilane-functionalized multiwalled carbon nanotubes, the sensitivity for the Pb2+ trace determination was improved to 95 % compared with the oxidized multi-walled carbon nanotubes, thus evidencing the significant enhancement of the adsorption capacity. 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Study Of Cross-linked Poly(methacrylic Acid) And Polyvinylimidazole As Selective Adsorbents For On-line Preconcentration And Redox Speciation Of Chromium With Flame Atomic Absorption Spectrometry Determination
No full textA redox speciation and preconcentration study of Cr(III) and Cr(VI) using a flow injection system with dual mini-columns prepared from cross-linked polymers-poly(methacrylic acid) and polyvinylimidazole was developed. Characterization of organic polymers was performed by using FTIR, SEM, TG, C:H:N and BET measurements. The equilibrium data obtained from Cr(III) adsorption on poly(methacrylic acid) and Cr(VI) on polyvinylimidazole were fitted very well to the dual site Langmuir-Freundlich model, suggesting the presence homogeneous and heterogeneous binding site and providing maximum adsorption capacities of 1.42 and 3.24mgg-1, respectively. The adsorption kinetics data were described by the pseudo-second-order model for both polymers, thus corroborating to isotherm data. The on-line preconcentration/speciation system was operated by loading 18.0mL of a solution containing Cr(III) and Cr(VI) at pH4.0 through the dual mini-columns at a flow rate of 3.0mLmin-1, where Cr(III) was selectively retained on poly(methacrylic acid), while Cr(VI) was retained on polyvinylimidazole. The limits of detection were found to be 0.84 and 1.58μgL-1 for Cr(III) and Cr(VI), respectively. The preconcentration factor (PF), consumptive index (CI) and concentration efficiency (CE) were found to be 47.3/8.6, 0.38/2.1mL and 7.88/1.43min-1 for Cr(III) and Cr(VI), respectively. The developed method was successfully applied to the speciation of chromium in different kinds of water samples. Satisfactory recovery values ranging from 89.9 to 108.3% were obtained. © 2014 Elsevier B.V.1171826Idris, S.A., Alotaibi, K., Peshkur, T.A., Anderson, P., Gibson, L.T., Preconcentration and selective extraction of chromium species in water samples using amino modified mesoporous silica (2012) J. 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