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高压消解-石墨炉原子吸收光谱法测定八角和桂皮中镉、铅含量

Physical Testing and Chemical Analysis Part B:Chemical Analysis(2015)

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Abstract
八角或桂皮样品经硝酸-过氧化氢(5+3)混合液高压密闭消解后,以20 g·L-1磷酸氢二铵作基体改进剂,采用石墨炉原子吸收光谱法测定其中镉和铅的含量.镉和铅的灰化温度分别为400℃,600 ℃;镉和铅的原子化温度分别为1 800℃,2 100℃.镉和铅的线性范围分别为10,50 μg·L-1以内,检出限(3s/k)分别为0.42,0.98 μg·L-1.加标回收率在96.0%~103%之间,测定值的相对标准偏差(n=6)在0.24%~1.7%之间.
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Key words
cadmium,lead
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