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首页> 外文期刊>Electroanalysis >Stripping voltammetric determination of iodide with synergistic accumulation at a carbon paste electrode
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Stripping voltammetric determination of iodide with synergistic accumulation at a carbon paste electrode

机译：碳糊电极上协同积累的溶出伏安法测定碘化物

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Carbon paste electrodes (CPEs) of various compositions were studied to elucidate the stripping voltammetric behavior of iodide. At an accumulation potential of +0.7 V (vs. Ag/AgCl), the CPE containing tricresyl phosphate as a pasting liquid was able to preconcetrate iodide effectively via ion-pairing reaction followed by oxidation to iodine and its extraction onto pasting liquid. In a supporting electrolyte containing 0.5 M NaCl and 0.1 M HCl, the reduction signal was proportional to iodide concentration from 5 x 10(-6) to 5 x 10(-7) mol/L with a detection limit of approximately 2.5 x 10(-7) mol/L (accumulation for 5 min). Other halides and pseudohalides did not interfere with the determination, except for a high concentration excess of thiocyanate and bromide (100:1). The method was tested on model solutions and was applied to determine total iodine in samples of table salts and mineral water. The results were compared to those obtained by reference methods. [References: 30]
机译：研究了各种组成的碳糊电极（CPE），以阐明碘化物的溶出伏安行为。在+0.7 V（vs. Ag / AgCl）的累积电势下，含有磷酸三甲苯酯作为糊状液体的CPE能够通过离子配对反应，然后氧化为碘并将其萃取到糊状液体中，有效地预先沉淀碘化物。在含有0.5 M NaCl和0.1 M HCl的支持电解质中，还原信号与碘化物浓度成正比，范围从5 x 10（-6）到5 x 10（-7）mol / L，检测极限约为2.5 x 10（ -7）mol / L（累积5分钟）。除了高浓度的硫氰酸盐和溴化物（100：1）外，其他卤化物和拟卤化物均不影响测定。该方法在模型溶液中进行了测试，并用于测定食盐和矿泉水样品中的总碘。将结果与参考方法获得的结果进行比较。 [参考：30]

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