Comparison of flame atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry for the determination of lead and cadmium in imitation jewelry
Abstract：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.
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