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首页> 外文期刊>Journal of the Indian Chemical Society >A rapid spectrophotometric method for measuring arsenic in water after enrichment of arsenomolybdate on polyurethane foam and complexation with Rhodamine B
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A rapid spectrophotometric method for measuring arsenic in water after enrichment of arsenomolybdate on polyurethane foam and complexation with Rhodamine B

机译：一种快速分光光度法测定聚氨酯泡沫中富集砷钼酸盐并与若丹明B络合后的水中砷

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摘要

Simple, rapid and accurate spectrophotometric method is presented for the determination of arsenic in water. The method is based on the prcconccntration of arsenomolybdate on polyurethane foam followed by its elution in acetone and formation of ion association complex of arsenomolybdate with Rhodamine B. The absorbance of the complex is measured at 560 ntn. The colour system obeys Beer's law from 0.5-5.0 ng mL~(-1) of arsenic. The detection limit has been found to be 0.10 ng mL~(-1) of As. The molar absorptivity was found to be 2.25 × 10~6 L mol~(-1) cm~(-1). Under optimized conditions, the proposed method was applied to the determination of arsenic present in surface and ground water samples collected from lakes and tube wells. The method has been applied successfully to determine arsenic in NIST standard water sample and the result is in good agreement with the certified value.
机译：提出了一种简单，快速，准确的分光光度法测定水中砷的方法。该方法是基于在聚氨酯泡沫上先沉淀砷钼酸盐，然后在丙酮中洗脱并形成砷钼酸盐与若丹明B的离子缔合复合物。该复合物的吸光度在560 ntn下测量。颜色体系从0.5-5.0 ng mL〜（-1）的砷中遵守比尔定律。检出限为As的0.10 ng mL〜（-1）。摩尔吸光度为2.25×10〜6 L mol〜（-1）cm〜（-1）。在最佳条件下，该方法可用于测定从湖泊和管井收集的地表水和地下水样品中的砷。该方法已成功应用于NIST标准水样中砷的测定，结果与标准值相符。

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