磷矿石中微量砷测定的新方法

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 Determination of Trace As in Phosphate Rocks

A new silver salt spectrophotometry is presented to determine trace arsenic of phosphate rocks, in which the generated arsenic hydride is absorbed by an absorbing solution and Zn-KI-SnCl-2 reduce sysytem of silver nitrate acetic acid polyvinylol ethanol. Beer's law is obeyed in the range of 01.5 g/ml of As3+. The recovery is 96%100.5%, at the 1.6010-3% level of arsnic the relative standard deviation is 1.23%, and the detection limit is 1.910-6 g/L.;