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砷钼杂多酸-结晶紫分光光度法测定贻贝和牡蛎组织中的砷
周逢葭1, 金明明1
国家海洋局第二海洋研究所
摘要:
本文采用HN03-H2SO4-HClO4对样品进行湿法消化处理,经AsH,发生和吸收后,用砷钼杂多酸-结晶紫分光光度法测定贻贝和牡蛎组织中的砷,经标样对照,结果良好。本法具有不需使用有机溶剂、灵敏度高、方便可靠等优点。本法的检出限为0.26μg,摩尔吸光系数达1.70×105,相对标准偏差为3.98%。
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基金项目:
SPECTROPHOTOMETRIC DETERMINATION OF ARSENIC IN MUSSEL AND OYSTER TISSUE WITH HETEROPOLY ARSENOMOLYBDICACID-CRYSTAL VIOLET
Abstract:
A highly sensitive spectrophotometric method was developed for the determination of arsenic in mussel and oyster tissue by the formation of heteropoly arsenomolybdic acid-crystal voilet complex. The reaction occurs in aqueus phase after HNO3-HC1O4-H2SO4 digestion and hydride generationabsorption, avoiding the use of hazardous organic reagent. The measured as contents in a mussel sample are in good agreement with those obtained by NIES of Japan. The method is convenient, versatile and reliable with a molar absorptivity value of 1.70×105 at 545nm, a detection limit of 0.26μg, and a relative standard deviation of 3.98%.
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