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首页> 外文期刊>International Journal of Electrochemical Science >Adsorptive Stripping Voltammetric Determination of Cobalt in the Presence of Nickel and Zinc Using Pyrogallol Red as Chelating Agent
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Adsorptive Stripping Voltammetric Determination of Cobalt in the Presence of Nickel and Zinc Using Pyrogallol Red as Chelating Agent

机译：邻苯三酚红为螯合剂吸附溶出伏安法测定镍和锌中的钴。

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An adsorptive stripping voltammetric (AdSV) method for the direct determination of Co in thepresence of Ni and Zn in natural waters based on metal complexation with pyrogallol red (PR) andsubsequent adsorptive deposition onto a hanging mercury drop electrode (HMDE) is presented.-1 Optimal analytical conditions were found to be: pH 7.8 (HEPES buffer 0.05 mol L ); CPR = 2.0 mol L ; Eads = .40 V vs. Ag/AgCl; and tads = 60 s. Peak current is proportional to Co concentration over the 0.00.0 g L range, with a 3detection limit of 0.02 g L . The relative standard deviation for a Co solution (5.0 g L ) was 2.1% for six successive assays. The Ni-PR complex is reduced at .86V, free ligand at .97 V, and the Co-PR complex at .08 V. In the presence of tetrabutylammoniumtetrafluoroborate (TBATFB) the Ni-PR complex is reduced at 180 mV more positive potentials and thesignal is finer. However, Zn interferes with the determination of Co due to overlapping of the waves.In the presence of 8-hydroxyquinoline (Ox) the Zn-Ox complex is reduced at 130 mV more negativepotentials than the Co-PR complex. The method was validated by determining Co in spiked syntheticsea water (ASTM D665), certified reference water (TMDA1) and was applied to the determinationof Co in sea water, tap water, and mineral water samples after UV digestion.
机译：提出了一种吸附脱附伏安法（AdSV），该方法基于与邻苯三酚红（PR）的金属络合以及随后吸附在悬挂式汞滴电极（HMDE）上的吸附沉积，直接测定天然水中的镍和锌中的钴.-1发现最佳分析条件为：pH 7.8（HEPES缓冲液0.05 mol L）; CPR = 2.0 mol L; Eads = 0.40 V，相对于Ag / AgCl;和tads = 60 s。峰值电流与0.00.0 g L范围内的Co浓度成正比，其3个检测极限为0.02 g L。六个连续测定的Co溶液（5.0 g L）的相对标准偏差为2.1％。 Ni-PR络合物在0.86V时还原，游离配体在0.97 V处还原，而Co-PR络合物在.08 V时还原。在四氟硼酸四丁基铵（TBATFB）存在下，Ni-PR络合物在180 mV时还原更多的正电势而且信号更好。但是，由于波的重叠，Zn干扰了Co的测定。在存在8-羟基喹啉（Ox）的情况下，Zn-Ox络合物在负电势下比Co-PR络合物减少了130 mV。该方法通过测定加标合成海水（ASTM D665），认证参比水（TMDA1）中的Co来验证，并用于UV消化后海水，自来水和矿泉水样品中Co的测定。

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