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目的:研究和建立微波消解—原子吸收光谱法测定胆巴中痕量铅、镉的方法体系。方法:采用微波消解样品,确定了石墨炉-原子吸收光谱法测定胆巴中的痕量铅、镉的最佳仪器条件,建立并考察了测定方法体系。结果:本方法铅的线性范围为2~40μg·L-1 y=0.0075x+0.0143(r=0.9986),仪器检出限为0.80μg·L-1,样品测定重复性RSD=2.78%,回收率为104.6%;镉的线性范围为0.2~4μg·L-1,y=0.0731x+0.0331(r=0.9953),仪器检出限为0.082μg·L-1,回收率为98.7%。结论:经与国家颁发的杨树叶质控样同法操作核对,结果吻合,该方法可广泛用于胆巴中痕量铅、镉的测定。
Objective: To study and establish a method for the determination of trace lead and cadmium in gall bladder by microwave digestion - atomic absorption spectrometry. Methods: The optimum instrument conditions for the determination of trace amounts of lead and cadmium in gall bladder by graphite furnace atomic absorption spectrometry were determined by microwave digestion samples. The system of determination was established and investigated. Results: The linear range of this method was 2 ~ 40μg · L-1 y = 0.0075x + 0.0143 (r = 0.9986). The detection limit was 0.80μg · L-1. The RSD of the sample was 2.78% The detection limit was 0.082 μg · L-1 and the recovery rate was 98.7%. The linear range of cadmium was 0.2-4 μg · L-1, y = 0.0731x + 0.0331 (r = 0.9953). Conclusion: The results of the validation of the same method with the control samples of poplar leaves issued by the state showed that the method is suitable for the determination of trace amounts of lead and cadmium in gall bladder.