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Cyclic Voltammetry Method for Analysis of Phosphate Concentration in Water
Full text linkPhosphate is a nontoxic element but a limiting element for productivity. Several methods have been established to analyze the phosphate concentration in water. This study aims to analyze phosphate concentration in water using the voltammetry method using cyclic voltammetry. Cyclic voltammetry is an electroanalytical method that measures the current outcome of oxidation-reduction reactions in response to the potential. The current outcome is directly proportional to the phosphate concentration in the solution. The calibration curve was formed from the KH2PO4 standard solution using concentrations of 0.1 mg/L, 0.2 mg/L, 0.4 mg/L, 0.8 mg/L, and 1.6 mg/L. The voltammogram showed that the analyte does not have an anode peak current (Ipa), which means that the analyte solution did not have an oxidation reaction, so the cathode peak current (Ipc) value was used. Based on the calibration curve, the linear regression graph with a straight-line equation is y = -0,00000645632x - 0,000208737 with R2 of 0,99737. Meanwhile, this cyclic voltammetry method was validated by calculating the LOD and LOQ values; the results are 0.1034 mg/L and 0.3134 mg/L, respectively. Hence, based on the analysis of phosphate concentration in water samples, this method works satisfactorily and is suitable for routine analysis because of its advantages
PEMBUATAN ELEKTRODA KERJA KOMPOSIT GRAPHENE OXIDE ZEOLITE UNTUK ANALISIS ASPIRIN SECARA SIKLIK VOLTAMETRI
Full text linkElektroda kerja komposit Graphene oxide Zeolite diguanakan untuk analisis aspirin secara siklik voltametri. Graphene oxide disintesis dengan metode improved hummer dan dipilih karena sifat konduktornya yang mudah menghantarkan listrik. Zeolite disintesis dengan metode mechanical ball milling dan dipilih karena sifat absorbennya yang dapat meningkatkan sensitivitas dari elektroda. Pengukuran aspirin dengan voltametri dipengaruhi oleh beberapa factor yaitu komposisi elektroda kerja dan pH . Penentuan komposisi elektroda kerja menggunakan perbandingan GO:paraffin: zeolite dengan perbandingan yaitu 3:2:5; 3:3:4; 3:4:3; 3:5:2. Penentuan pH optimum dilakukan dengan variasi pH larutan buffer sitrat pada pH 2,3,4,5,6,7. Hasil penelitian elektroda kerja komposit Graphene oxide zeolite memiliki komposisi terbaik pada perbandingan 3:2:5 dengan pH optimum larutan 4.Persen perolehan data kembali didapatkan hasil sebesar 99,612 %. Elektroda komposit Graphene oxide zeolite menunjukan sensitivitas dan selektivitas yang baik
Fabrication of Carbon Paste Electrode Modified with ZnO Nanoparticles and Nanobentonite for Analysis of Bisphenol A by Cyclic Voltammetric
Full text linkThe Bisphenol A (BPA) is a 2,2-bis(4-hydroxyphenyl) propane compound that is produced on a large scale for industrial applications, particularly in polycarbonate plastics. BPA molecules can migrate from plastics into food if stored at high temperatures and for extended periods. Various methods have been developed for BPA analysis, including cyclic voltammetry. This study focuses on the fabrication and application of a carbon paste electrode (CPE) modified with ZnO nanoparticles and nanobentonite for the analysis of BPA in polycarbonate-based bottled drinking water using cyclic voltammetry. The results showed that the optimal electrode conditions were: electrode composition 3:4:1:2 (carbon: nanobentonite: ZnO nanoparticles: paraffin), and pH 7. The BPA content obtained by cyclic voltammetry for brands A, B, and C was 0.2102; 0.1752; and 0.2210 mM. These results demonstrate that cyclic voltammetry with a ZnO nanoparticle and nanobentonite modified carbon paste electrode can be used for BPA analysis
Development of nano titanium dioxide modified carbon paste electrode for determination of chloramphenicol in vaname shrimp (Litopenaeus vannamei) pond water by cyclic voltammetry
Full text linkChloramphenicol is an antibiotic that has activity against aerobic, anaerobic, and fungal bacteria and is often used in vaname shrimp farming pond water. Behind its usefulness, chloramphenicol has side effects for health, such as aplastic anemia, bone marrow suppression, stomach intestinal disorders, and optical and peripheral neuropathy. This study aims to determine the ability of carbon paste electrodes modified with nano titanium dioxide to detect chloramphenicol levels in vaname shrimp pond water by cyclic voltammetry. This research has successfully made an electrochemical sensor as a nano titanium dioxide-modified carbon paste electrode to detect chloramphenicol in vaname shrimp pond water samples. Nano titanium dioxide used as a modifier in carbon paste electrodes was characterized by XRD (X-Ray Diffraction) and FTIR (Fourier Transform Infrared), while the study of electrochemical characteristics using cyclic voltammetry method. The electrochemical sensor that has been made is a nano titanium dioxide-modified carbon paste electrode that can detect chloramphenicol in vaname shrimp pond water using the cyclic voltammetry method
PEMBUATAN ELEKTRODA KERJA GRAPHENE OXIDE-PARAFFIN UNTUK ANALISIS LOGAM Cd MENGGUNAKAN CYCLIC VOLTAMMETRY MAKING OF GRAPHENE OXIDE-PARAFFIN WORKING ELECTRODE FOR ANALYSIS OF Cd USING CYCLIC VOLTAMMETRY
Full text linkAbstrak. Graphene Oxide (GO) merupakan turunan alotrop karbon yang dapat dimanfaatkan sebagai elektroda secara maksimal. Penelitian ini bertujuan untuk mengetahui hasil karakterisasi dan hasil analisis Cd(II) dari Graphene Oxide-Paraffin yang akan digunakan sebagai elektroda kerja pada Cyclic Voltammetry (CV) dengan kondisi optimum. GO disintesis dari grafit dengan metode Improved Hummer kemudian dilakukan karakterisasi untuk memastikan bahwa sudah terbentuk GO. GO yang dihasilkan dilakukan dua jenis karakterisasi meliputi karakterisasi fisika dan kimia. Karakterisasi fisika menggunakan PSA untuk mengetahui ukuran partikelnya, menggunakan XRD untuk mengetahui puncak difraksi dua tetha kemudian dibandingkan dengan spektrum XRD referensi dan karakterisasi kimia menggunakan FTIR untuk mengetahui gugus fungsinya. Hasil analisis spektrum FTIR pada GO menunjukkan gugus -OH pada bilangan gelombang 3314 cm-1, ikatan C=C pada panjang gelombang 1632 cm-1 dan ikatan C-O pada panjang gelombang 1383 dan 1092 cm-1. Hasil analisis XRD pada GO menunjukkan puncak difraksi 2θ pada 11,53o. Hasil analisis voltametri menunjukkan komposisi elektroda GO-paraffin yang menghasilkan voltamogram terbaik adalah komposisi dengan perbandingan 8:2. Kondisi pH optimum untuk analisis Cd(II) menggunakan elektroda GO-paraffin adalah pada pH 6,5. Elektroda GO-paraffin menghasilkan kurva linier pada larutan Cd(II) dengan linieritas 0,98992. Analisis CV dengan menggunakan elektroda GO-paraffin pada kondisi optimum menghasilkan rata-rata % recovery 97,64 % lebih baik dibandingkan dengan analisis instrumen AAS sebesar 86,32 %. Kata Kunci : Graphene Oxide, Cyclic Voltammetry, Kadmium Abstract. Graphene Oxide (GO) is a carbon allotropic derivative that can be used as an electrode. This study aims to determine the results of the characterization and results of the analysis of Cd (II) from Graphene Oxide-Paraffin which will be used as a working electrode on Cyclic Voltammetry (CV) with optimum conditions. The GO was synthesized from graphite using the Improved Hummer method and characterization was carried out to ensure that the GO was formed. The resulting GO is carried out by two types of characterization including physical and chemical characterization. Physical characterization using PSA to determine the particle size, using XRD to determine the diffraction peaks of two tetha then compared with the reference XRD spectrum and chemical characterization using FTIR to determine its function group. The results of FTIR spectrum analysis on GO showed the -OH group at wave number 3314 cm-1, C=C bond at a wavelength of 1632 cm-1 and the C-O bond at a wavelength of 1383 and 1092 cm-1. The results of XRD analysis on GO showed a diffraction peak of 2θ at 11.53o. The results of voltammetric analysis showed that the composition of GO-paraffin electrodes which produced the best voltammogram was a composition with a ratio of 8: 2. The optimum pH condition for Cd (II) analysis using GO-paraffin electrode is at pH 6.5. GO-paraffin electrodes produce linear curves in Cd (II) solution with linearity of 0.98992. CV analysis using GO-paraffin electrodes at optimum conditions resulted in an average recovery of 97.64% better than the analysis of AAS instruments of 86.32%. Keywords : Graphene Oxide, Cyclic Voltammetry, Cadmiu
Fabrication of carbon pasta elektroda composition modified with nanobentonite and nano TiO2 for niacinamide detection sensor
Full text linkNiacinamide is the amide form of vitamin B3, which is usually analyzed for concentration using UV-Vis Spectrophotometry, HPLC, and KLT. The development of niacinamide analysis methods using cyclic voltammetry has not been widely studied. The use of working electrodes in cyclic voltammetry is usually carbon paste electrodes. However, these electrodes have disadvantages, relatively low sensitivity and slower electron transfer kinetics, so it is necessary to research working electrode modification to increase electrode sensitivity. This study aims to determine the effect of the addition of nanobentonite and nano TiO2 on carbon paste electrodes in improving electron transfer and electrode sensitivity in the analysis of niacinamide by cyclic voltammetry. Variations in electrode composition were conducted to determine the optimum composition in measuring niacinamide solution and the optimum pH in measuring niacinamide. Nanobentonite obtained from the synthesis using the sonochemical method produces an average particle size of 46.9 nm, and the composition of carbon, paraffin, nanobentonite, and nano TiO2 electrodes with a variation of 3:2:3:2 b/v has the highest current peak. The better the conductivity of the working electrode, the greater the maximum current peak produced due to the easy transfer of electrons for the reduction and oxidation reaction process. Using a buffer solution to adjust the pH of the niacinamide solution affects the analysis process, as evidenced by the IpA value at pH 7. The effect of pH variation also affects the stability of existing ions. So that the resulting current is higher, the higher the peak current value produced indicates, the more sensitive the electrode is due to high electron transfer. It maximizes the analysis of the concentration of the test solution because the measured concentration is linear with the measured current
The Fabrication of ZnO Nanoparticles-Modified Carbon Paste Electrode for the Analysis of Nicotine Content in E-Cigarette Liquids by Cyclic Voltammetry
No full textZnO nanoparticles were used as composites on carbon paste working electrodes to enhance electrode performance in the analysis of nicotine content in e-cigarette liquids by voltammetry cyclic. The optimum composition and condition (pH and scan rate) were determined to identify the conditions that gave the best response. ZnO nanoparticles were synthesized using the sol-gel method and characterized by FTIR, XRD, and SEM. The determination of optimum composition and conditions was studied using cyclic voltammetry. The determination of nicotine content in e-cigarette liquids was analyzed by cyclic voltammetry. The electrode composition that gave the best response was 3:5:2 (carbon: nanoparticles ZnO: paraffin). The optimum conditions for nicotine determination by cyclic voltammetry were at pH 8 and a scan rate of 90 mVs-1. The cyclic voltammetry’s limit detection (LoD) using a ZnO nanoparticles-modified carbon paste electrode is 0.00678 mg/mL, and the percent recovery is 100.35%
Pemisahan trigliserida dalam lemak dengan kromatografi kolom dan penentuan asam lemak hasil hidrolisisnya secara spektrofotometri
No full textPENGARUH VARIASI pH TERHADAP PENGUKURAN ASAM OKSALAT DENGAN ELEKTRODA GRAPHENE OXIDE TERMODIFIKASI NANOBENTONIT SECARA SIKLIK VOLTAMETRI THE EFFECT OF VARIOUS pH VALUES ON MEASUREMENT OXALIC ACID USING NANOBENTONITE MODIFIED GRAPHENE OXIDE ELECTRODE BY CY
Full text linkPEMBUATAN ELEKTRODA KERJA GRAPHENE OXIDE TERMODIFIKASI NANO BENTONIT UNTUK ANALISIS ASAM NIKOTINAT SECARA VOLTAMETRI SIKLIK MAKING OF GRAPHENE OXIDE NANO BENTONITE MODIFIED WORKING ELECTRODE FOR ANALYSIS NICOTINIC ACID USING CYCLIC VOLTAMMETRY
Full text linkPada penelitian ini telah dilakukan penelitian pengukuran asam nikotinat menggunakan elektroda kerja Graphene oxide termodifikasi nano bentonit dengan metode voltametri siklik. Elektroda kerja Graphene oxide termodifikasi nano bentonit dibuat dengan cara mencampurkan Graphene oxide, parafin, dan nano bentonit dengan perbandingan 3:5:2, 3:4:3, 3:3:4, 3:2:5. Parameter optimasi yang diuji yaitu kondisi optimum (pH, waktu deposisi, dan laju pindai), komposisi modifier nano bentonit yang ditambahkan. Elektroda kerja Graphene oxide termodifikasi nano bentonit pada kondisi pengukuran optimum digunakan untuk menentukan analisis asam nikotinat secara voltametri siklik. Hasil penelitian menunjukkan komposisi terbaik diperoleh 3:3:4 dengan nilai puncak katodik -0.00375A. pH optimum diperoleh 5 dengan nilai puncak katodik -0.00337A. Waktu deposisi optimum diperoleh selama 5 detik dengan nilai puncak katodik -0.00144A dan laju pindai optimum diperoleh 100 mV/detik dengan nilai puncak katodik -0.00272A. Perbandingan persen perolehan kembali asam nikotinat secara voltametri siklik dengan elektroda kerja Graphene oxide termodifikasi nano bentonit lebih besar yaitu 96.164% dibandingkan dengan metode HPLC adalah 88.332%.Kata kunci : graphene oxide, nano bentonit, asam nikotinat, voltametri siklik
In this research modified Graphene oxide electrode with nano bentonite has been prepared, for determination of nicotinic acid using cyclic voltammetry. Graphene oxide electrode modified by nano bentonite was made by with mixing Graphene oxide, paraffin, and nano bentonite with 3:5:2, 3:4:3, 3:3:4, 3:2:5. The observed parameters includes pH, deposition time, scan rate at modified Graphene oxide electrode with nano bentonite, and composition of modifier in modified Graphene oxide Graphene oxide electrode with nano bentonite. The results showed the best composition obtained 3:3:4 with an peak of cathodic value of -0.00375A. The optimum pH obtained 5 with an peak of cathodic value of -0.00337A.The optimal deposition time obtained for 5 seconds with an peak of cathodic value of -0.00144A and optimal scanning rate obtained 100 mV/second with an peak of cathodic value -0.00272A. Comparison of the results of nicotinic acid recovery using Graphene oxide nano bentonite modified electrode using the cyclic voltammetry method is greater that is 96.164% compared to the method HPLC is 88.332%.Key words: graphene oxide, nano bentonite, nicotinic acid, cyclic voltammetr
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