火焰原子吸收光谱法测定碳酸锰中9种杂质元素

Determination of 9 Trace Elements in Manganese Carbonate by FAAS

用(1+9)盐酸溶液溶解碳酸锰样品,使用火焰原子吸收光谱法测定碳酸锰中Pb、Cd、Cr、K、Na、Ca、Mg、Fe、Cu等杂质元素含量。结果表明,在试验范围内大量锰的存在对K、Na、Ca、Mg、Fe、Cu的火焰原子吸收光谱法测定无影响,对Pb、Cd、Cr有负干扰,采用标准加入曲线法测定能消除此干扰;各元素的加标回收率为91.3%～101.0%,每个样品平均进行5次测定的相对标准偏差RSD<5%。该方法操作简便,分析速度快,结果准确。

By dissolving samples with（1＋9） hydrochloric acid,the trace elements such as Pb,Cd,Cr,K,Na,Ca,Mg,Fe,and Cu in manganese carbonate were measured by flame atomy absorb spectrum（FAAS） with standard addition method.Non-influence was observed in determining K,Na,Ca,Mg,Fe,and Cu.However,negative interference was detected in determining Pb,Cd,and Cr,which can be reduced by standard addition method.The results showed that the correlation coefficient of calculation curves was above 0.995.The percent recovery was between 91.3% and 101.0% and relative standard deviation（RSD） was less than 5%.FAAS with standard addition method is simple,quick and precision in trace elements determination.