塞曼石墨炉原子吸收法测定环境水样中的痕量铅

Determination of trace lead in environmental water samples by Zeeman effect of graphite furnace atomic absorption spectrophotometry

采用塞曼效应石墨炉原子吸收法测定环境水样中的痕量铅 ,研究了石墨炉升温程序及基体改进剂对测定的影响。测定结果表明 ,采用塞曼扣背景、以硝酸镁和磷酸二氢铵为基体改进剂测定环境水样中的痕量铅的方法 ,大大提高了测量的精密度和准确度 ,方法的检出限为 2 3× 10 -10 g ,相对标准偏差为4 9%。

Zeeman effect of graphite furnace atomic absorption spectrophotometry was adopted to determine trace lead in environmental water samples, also the temperature raising procedure of graphite furnace and the effect of matrix modifier on the determination were studied. It showed that application of Zeeman effect to deduct background and the use of magnesium nitrate and ammonium biphosphate as matrix modifiers greatly improved the precision and accuracy of the determination. The detection limit of the method was 2.3×10 -10g, and the relative standard deviation was 4.9%.