原子吸收光谱法测定废水中微量铅时锰镁铁干扰的消除方法

Elimination of the interference of manganese,magnesium,iron on the determination of lead in waste water with atomic absorption spectrometry

原子吸收光谱法测定废水中微量铅时，废水中锰、镁、铁对测定产生严重干扰。利用标准曲线法和标准加入法测定，即使线性相关系数达到0．999以上，其误差仍可高达几十倍，本文利用自吸扣背景测定可解决这一问题。该方法RSD为2．1％～2．4％，回收率在94．0％～106．0％之间，消除了原子吸收光谱法测定废水中微量铅时因锰镁铁干扰而带来的严重误差。

Mn, Mg and Fe had serious disturbances on the determination of Pb in waste water by atomic absorption spectrometry. Although the linear relative coefficients were more than 0. 999, the errors still achieved many times respectively by using of the standard curve method and the standard addition method. This problem could be solved by the method of self-reversal deducting background. The relative standard deviations of the method were from 2.1% to 2.4 %, and the recoveries were in the range of 94.0 % - 106.0 %. The research resolved the grave errors created by Mn, Mg, Fe on the determination of Pb in the waste water by atomic absorption spectrometry.