氢氧化铁共沉淀电感耦合等离子体发射光谱法测卤水中的痕量钴镍锰

Determination of Trace-Cobalt,Nickel and Manganese in Brine by Inductively Coupled Plasma-Atomic Emission Spectrometry after Co-precipitation with Iron Hydroxide

用氢氧化铁共沉淀分离卤水中的钴镍锰,用王水[V(王水)∶V(水)=1∶1]溶解沉淀定容,电感耦合等离子发射光谱法测定。检出限为LDD(Co,Mn)=0.10mg/L,LDD(Ni)=0.27mg/L,加标回收率为95.00%～102.00%,精密度(n=12)为1.05%。经过多次的加标回收率的验证,满足测试要求,因此,可以准确测定卤水中钴镍锰,且操作简单,满足测试要求,已经用于实验室检测。

The contents of Co,Ni and Mn in brine sample were determined by inductively coupled plasmaatomic emission spectrometry（ICP-AES）after co-precipitation with ferric hydroxide and decomposing and extracting with aqua regia[V（aquaregia）∶V（H2 O）=1∶1].The detection limits for Co and Mn were both0.10 mg/L,and the detection limit for Ni was 0.27 mg/L.The recovery rates were in the range of95.00%～102.00% with a RSD（n=12）of 1.05%.The results of multiple standard recovery were satisfactory.The method has the merits of easy operation,practicality and low cost,which meet the demands for the laboratory testing.