石墨炉原子吸收光谱法测定尿中镉

Graphite furnace atomic absorption spectrometric method for the determination of cadmium in urine

目的:探索简便快速准确检测尿中镉的方法。方法:采用Triton X-100稀释首次350℃通氧灰化,再次450℃灰化、原子化温度1500℃,0.1%硝酸钯+0.06%硝酸镁作为基体改进剂,石墨炉原子吸收法测定。结果:增加通氧灰化能有效消除积炭干扰,线性范围为0μg/L～5μg/L,回收率为97.7%～104%,检测限为0.24μg/L,精密度测定相对标准偏差为2.7%～5.9%。结论:本方法标准曲线配置简便、样品测定快速准确灵敏,能满足大批量尿样的检测工作。

Objective：To explore a simple,rapid and accurate method for determination of cadmium in urine.Methods： The samples were diluted by Triton X-100 with oxygen ashing first at 350℃,then at 450℃ and atomizing temperature of 1500℃,0.1% palladium nitrate＋ 0.06% magnesium nitrate was taken as matrix modifier,and graphite furnace atomic absorption spectrometry was used for determination.Results： Oxygen ashing can effectively eliminate the interference of carbon deposition,the linear range of the method was 0 μg/L^5 μg/L,the recoveries were 97.7%~104%,the detection limit was 0.24 μg/L,and the RSDs were 2.7%~5.9%.Conclusion： The method can meet the requirements of detection for a large quantity of urine samples due to the speed,sensitivity,accuracy and simple operation.