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研究测定磷矿石中微量砷的新方法，以硝酸银—乙酸—聚乙烯醇（ＰＶＡ）—乙醇作为砷化氢吸收液，Ｚｎ－ＫＩ－ＳｎＣｌ２为还原体系的新银盐光度法测定砷。Ａｓ３＋质量浓度在０～７．５μｇ／５ｍｌ范围内服从Ｂｅｅｒ定律。方法回收率为９６％～１００．５％，分析含砷１．６０×１０－３％，ＲＳＤ为１．２３％，方法检出限为１．９×１０－６ｇ／Ｌ。
A new method for the determination of arsenic in phosphate rock was developed. A new silver salt photometric method was developed for the determination of arsenic with silver nitrate - acetic acid - polyvinyl alcohol (PVA) - ethanol as arsine absorber and Zn - KI - SnCl2 as the reducing system. As3 + mass concentration in the range of 0 ~ 7.5μg / 5ml Beer’s law. The recovery of the method was 96% -100.5%. The arsenic content was 1.60 × 10-3%, the RSD was 1.23%. The detection limit was 1.9 × 10-6g / L.