双重消除基体干扰的石墨炉原子吸收法测定尿铅

Determination of lead in urine by double elimination of matrix interferences-graphite furnace atomic absorption spectrometry

目的:建立能彻底消除基体干扰的石墨炉原子吸收法测定尿铅的分析方法。方法:在尿液中加入氯化钯,静置使试液析出沉淀,并提高灰化温度、优化实验条件。结果:背景吸光值降至≤0.13,回收率95.0%,标准曲线方程Y=0.003273X+0.0009,r=0.9990。结论:建立的方法,消除了基体干扰,析出的沉淀不引起尿铅的损失,测定结果准确可靠。

Objective：To eliminate the matrix interference in graphite furnace atomic absorption spectrometry analysis of lead in urine.Methods： Addition of palladium chloride in the urine,standing to precipitate precipitation test solution and improve ashing temperature,the optimal conditions.Results： Background absorbance down to ≤0.13,recovery was 95.0%,Y=0.003273X＋0.0009,r=0.9990.Conclusion： The method,eliminating the matrix interference,the precipitation will not cause precipitation of lead in urine loss,the result is accurate and reliable.