氢氧化铁共沉淀-氢化物发生-原子荧光光谱法测定卤水中痕量硒

Determination of Trace Selenium in Brine by Hydride Generation-Atomic Fluorescence Spectrometry with Ferric Hydroxide Co-precipitation

氢氧化铁共沉淀分离卤水中痕量硒,用盐酸溶解沉淀并酸化,盐酸水浴加热还原六价硒为四价硒,氢化物发生-原子荧光光谱法测定硒。检出限(3S/N)为=0.076μg.mL-1,加标回收率为90.0%—100.0%,相对标准偏差(n=11)为1.25%。

Trace selenium in brine was separated by ferric hydroxide co-precipitation,and the co-precipitation was dissolved and acidized by hydrochloric acid,and Se（Ⅵ） was reduced to Se（Ⅳ） in heating water bath of hydrochloric acid,then the selenium was determined by hydride generation-atomic fluorescence spectrometry（HG-AFS） after separation.The instrument detection limit was 0.076μg·mL-1.The recoveries of the method was 90.0%—100.0%.The precision（RSD,n=11） was 1.25%.