石墨炉原子吸收光谱法测定水中铅基体改进剂的优化选择

Optimization and choice of matrix modifiers when determining Pb by GFAAS

目的:建立一种可以有效消除干扰石墨炉原子吸收光谱法测定水中铅的方法。方法:分别以5%抗坏血酸、2%磷酸二氢铵、1.2%磷酸二氢铵+0.5%硝酸镁作为基体改进剂,进行样品分析。结果:以5%抗坏血酸作为基体改进剂,得到较好效果。结论:5%抗坏血酸可以有效扣除背景对测定的干扰。

Objective： To establish a method for effective elimination of the matrix interference when determining Pb by GFAAS. Methods ：5% Vitamin C,2% （ NH4 ） H2P04 and 1.2% （ NH4 ） H2PO4 ＋ 0. 5% Mg（ NO3 ） 2 were used as matrix modifiers in proper order during the determination. Results：When 5% Vitamin C was matrix modifier, the result of the determination was satisfied. Conclution：5% Vitamin C can eliminate the matrix interference.