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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Determination of arsenate and organic arsenic via potentiometric titration of its heteropoly anions
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Determination of arsenate and organic arsenic via potentiometric titration of its heteropoly anions

机译：电位滴定滴定法测定砷酸和有机砷

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摘要

Determination of arsenate based on its conversion to molybdoarsenate heteropoly anions followed by potentiometric titration is described. The titration is realized on the ion-pairing principle using cetylpyridinium chloride (or an analogous titrant containing a lipophilic cation), and is monitored by a carbon paste electrode, although other liquid-polymeric membrane-based electrodes can also be used. Calibration plots of the titrant end-point consumption versus concentration of arsenic were constructed and used to evaulated the content of arsenic in aqueous samples. The method could be applied in the analyses of samples with quite low arsenic content (amounts approx= 10 mug As in 50 cm~3 could be titrated). Organic arsenic was determined analogously after the Schoniger combustion of the sample and conversion of its arsenic to arsenate.
机译：描述了基于砷的转化为钼酸砷杂多阴离子，然后进行电位滴定法测定的方法。使用氯化十六烷基吡啶鎓（或类似的包含亲脂性阳离子的滴定剂），根据离子对原理实现滴定，并通过碳糊电极进行监测，尽管也可以使用其他基于液体聚合物膜的电极。绘制了滴定剂终点消耗量与砷浓度的校准图，并将其用于评估含水样品中砷的含量。该方法可用于砷含量极低的样品的分析（可滴定大约10杯砷（在50 cm〜3中滴定））。在样品进行了Schoniger燃烧并将其砷转化为砷酸盐后，类似地确定有机砷。

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