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目的:对氢化物发生-原子荧光光谱法测定痕量铅的分析条件进行试验并予以优化。方法:用酸洗活性炭处理铁氰化钾,对铁氰化钾抑制常见几种共存元素干扰能力进行了测试,在不同盐酸介质浓度及硼氢化钾浓度条件下对样品进行测定。结果:酸洗活性炭处理铁氰化钾后能降低空白荧光值,并具有一定的抑制共存元素干扰作用;在选定最佳工作条件下,方法的线性范围为0~50μg/L,检出限为0.14μg/L,相对标准偏差(对10.0μg/L Pb,n=20)为1.5%。应用该法对大米和水样中铅含量进行了测定,加标回收率为93.0%~104.8%。结论:分析条件优化后,该方法适用于公卫样品痕量铅的测定。
OBJECTIVE: To test and optimize the analytical conditions for the determination of trace lead by hydride generation-atomic fluorescence spectrometry. Methods: Activated carbon pickling treatment of potassium ferricyanide, potassium ferricyanide inhibition of several common coexisting elements interfere with the ability to test in different concentrations of hydrochloric acid and potassium borohydride concentration of the sample was measured. Results: Pickling activated carbon could reduce the blank fluorescence value after treated with potassium ferricyanide, and could inhibit the interference of coexisting elements. Under the optimum conditions, the linear range of the method was 0 ~ 50μg / L, the detection limit Was 0.14 μg / L, and the relative standard deviation was 1.5% for 10.0 μg / L Pb, n = 20. The method was applied to the determination of lead in rice and water samples. The recoveries were 93.0% -104.8%. Conclusion: This method is suitable for the determination of trace lead in public health samples after the analysis conditions are optimized.