石墨炉原子吸收光谱法直接测定尿中铅浓度研究

目的建立直接测定尿中铅浓度的石墨炉原子吸收光谱法。方法用5 g/L的磷酸二氢铵作为基体改进剂,采用塞曼扣除背景,石墨炉原子吸收光谱法直接测定尿液中铅的浓度。结果该方法线性范围0～50μg/L,相关系数0.999 0,检出限0.84μg/L,回收率90.0%～98.9%。结论该法背景干扰低,稳定性好,测定结果准确可靠,方法简单,适合大批量样品的检测。

With Graphite Furnace Atomic Absorption Spectrometry Method to Directly Determine the Lead Density in Urine

Objective To establish a direct way to determine the lead in urine with graphite furnace atomic absorption spectrometric method(GFAAS).Methods With 5 g/L density of ammonium dihydrogen phosphate as matrix modifier and after Zeeman background correction,GFAAS method was employed to determine the concentration of lead in the urine.Results The outcomes were: linear range 0-50 μ g/L,correlation coefficient 0.9990,detection limit 0.84 μg/L and recovery 90.0%-98.9%.Conclusion The method is suitable for massive sample determination due to the following advantages: low background interference,good stability,accurate and reliable.