微波消解石墨炉原子吸收法测定环境空气中痕量锡

建立石墨炉原子吸收法测定环境空气中痕量锡的方法。采用混合纤维素微孔滤膜采集环境空气样品,用硝酸–氢氟酸微波消解样品,以5%硝酸镧–10%酒石酸混合液作基体改进剂,石墨炉原子吸收法进行测定。当采样体积为4 800 L,定容体积50 m L时,方法检出限为0.024μg/m~3,样品加标回收率为96.0%~106.0%,测定结果的相对标准偏差为2.74%~5.81%(n=7)。该方法样品处理操作过程简单,酸用量少,可用于环境空气中痕量锡的测定。

Determination of Trace Tin in Ambient Air by Microwave Digestion Graphite Furnace Atomic Absorption Spectrometry

The method for determination of trace tin in ambient air by graphite furnace atomic absorption spectrometry was established. Ambient air sample was collected by using mixed cellulose microporous membrane, and digested by microwave with nitric acid–hydrofluoric acid, and 5% lanthanum nitrate–10% tartaric acid mixed solution was used as matrix modifier,then the sample solution was determined by graphite furnace atomic absorption spectrometry. When the sampling volume was 4 800 L, the constant volume was 50 mL, the detection limit was 0.024μg/m3. The recovery rate was 96.0%–106.0%, and the relative standard deviation of determination results was 2.74%–5.81%(n=7). This method is simple with the less acid dosage,and it can be used for the determination of trace tin in ambient air.