火焰原子吸收光谱法和电感耦合等离子体原子发射光谱法测定仿真饰品中铅、镉的对比探讨

摘要

采用火焰原子吸收光谱法(FAAS)与电感耦合等离子体原子发射光谱法(ICP-AES)两种方法对仿真饰品中铅、镉进行了测定,系统地考察了两种分析方法的校准曲线、相关系数、检出限、准确度和精密度.实验结果显示两种方法均可以对仿真饰品中铅、镉进行准确的定量分析.FAAS光谱干扰小,能够有效地规避仿真饰品溶液中高浓度铁基体对铅、镉测定的干扰,对基体复杂的仿真饰品的测定不需要基体匹配就可实现准确的分析测定,其中铅的检出限为0.000 975%,加标回收率为93%~105%;镉的检出限为0.000 225%,加标回收率为95%~103%.ICP-AES对于高基体样品使用基体匹配法能够减少基体效应带来的误差,使分析结果准确,其中铅、镉的检出限分别为0.000 060 0%和0.000 023 5%,加标回收率分别为97%~102%和95%~104%.%Flame atomic absorption spectrometry (FAAS) and inductively coupled plasma atomic emission spectrometry (ICP-AES) were applied to detect lead and cadmium in imitation jewelry.The calibration curve, linear correlation, precision and accuracy of two methods were tested systematically.The results showed that the FAAS and ICP-AES can be used for accurate quantitative analysis of lead and cadmium in imitation jewelry.Compared with ICP-AES, the FAAS can effectively avoid the interference of the high concentration iron matrix to the determination of lead and cadmium, which could achieve accurate and quantitative analysis of complex imitation jewelry without matrix matching.The detection limit of lead was 0.000 975%, and the recoveries were 93%-105%;the detection limit of cadmium was 0.000 225% and the recoveries were 95%-103%.ICP-AES can reduce matrix effect with matrix matching method for high substrate samples and achieve accurate results.The detection limit of lead and cadmium were 0.000 060 0% and 0.000 023 5%, while the standard addition recovery were 97%-102% and 95%-104%, respectively.