工作场所空气中锡的L-半胱氨酸-原子荧光测定法

目的利用氢化物发生-原子荧光光谱法,在L-半胱氨酸存在的情况下,测定工作场所空气中的锡。方法样品经盐酸消解,用2%盐酸溶液做载流,原子荧光分光光度计进行测定。结果方法的测定范围为5.0～200.0μg/L,相对标准偏差为2.15%～3.40%,回收率为92.5%～103.5%,检出限为0.71μg/L。结论由于L半-胱氨酸的存在,改善了氢化物发生条件,增敏光谱测定信号,降低了溶液的酸度,金属离子的干扰显著地得到了抑制,适用于工作场所空气中锡的测定。

Determination of air Stannum in Workplace by L-cysteine and Atomic Fluorescence Spectrometry

[Objective]To determine the air stannum in workplaces by hydride generation-atomic fluorescence spectrometry,with the existence of L-cysteine.[Methods]After digested by hydrochloric acid,the samples were determined by atomic fluorescence spectrometer with 2% hydrochloric acid as carrier liquid.[Results]The range of measurement was 5.0～200.0 μg/L,the RSD was 2.15%～3.40%,the recoveries ranged from 92.5%～103.5%,and the detection limits of this method was 0.71 μg/L.[Conclusion]Due to the presence of L-cysteine,the hydride generation conditions are improved,the spectrometric signal is enhanced,and the acidity of solution is reduced.In addition,the interferences of the metal elements are significantly inhibited.The method is suitable for determination of air stannum in workplace.