Determination of zinc in environmental samples by anodic stripping voltammetry

Combining Alkaline Extraction and in Situ Plated Bismuth Film for Reliable Quantification of Zn in Multivitamin Formulations

“…As a consequence, it was observed a much better repeatability for the voltammetric signal of Zn in 0.1 mol L −1 acetate buffer solution (pH 4.74). Hydrogen evolution can also compromises the repeatability since hydrogen bubbles could damage the deposited bismuth film or partially block the glassy carbon surface 50. Regarding that the pH of KNO 3 solution is 3.0 which is lower than that of acetate buffer (pH 4.74), hydrogen reduction is more favorable in this solution which can also explain the poor repeatability observed in KNO 3 compared with acetate buffer solution.…”

“…Moreover, Zn has a strong tendency to form intermetallic compounds, mainly with Cu, which gives rise to poorly defined voltammetric peaks or voltammetric signals affected by the concentration of Cu 2+ in the electrochemical cell. The main approaches used to achieve Zn determination by ASV is to use electrodes with high overvoltage for hydrogen evolution, such as BDD 6, 49 and BiFEs 10 or adding Ga or sulfite in the electrochemical cell in order to prevent the formation of Zn‐Cu intermetallic 50.…”

UV-Assisted Digestion of Petrochemical Industry Effluents Prior to the Determination of Zn, Cd, Pb and Cu by Differential Pulse Anodic Stripping Voltammetry

“…The factorial design levels were defined according to some literature references, [12][13][14][15] having minimum and maximum values of 0.5 and 9.5 mL, 20 and 160 s, 0.02 and 0.06 s, 20 and 70 mV, 30 and 90 mV s −1 for electrolyte volume, deposit time, pulse time, pulse amplitude and sweep rate, respectively. Water was added to the voltammetric cell according to the amount of each electrolyte test to complete a total volume of 11 mL.…”

Immobilization of Tetrabutyl Thiuram Disulfide in Chitosan Thin Film for Sensing Zinc Ion Using Surface Plasmon Resonance Spectroscopy

“…Owing to the importance and potential for toxicity, several methods have been developed for the detection of Zn 2+ , including atomic absorption spectroscopy, (3) inductively coupled plasma mass spectroscopy, (4) ratiometric fluorescent probing, (5) spectrophotometry, (6) voltammetry, (7) and polarography. (8) However, these methods are generally expensive, require a complicated sample treatment, and often take a long measurement time.…”