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    氢化物发生-电热原子吸收光谱法测定人发中铅

    Hydride Generation-Electrothermo-Atomic Absorption Spectrometric Determination of Lead in Human Hair

    • 摘要: 经清洗并干燥的人发样用硝酸-高氯酸混合酸溶解,试样溶液中铅(Ⅱ)转化成铅烷(PbH4)及试样中铅量的测定采用WHG-102A2型流动注射氢化物发生器及GGX-9型原子吸收光谱仪的联用而自动完成.方法的最佳测定条件,包括铁氰化钾的加入量、原子化温度、高氯酸的影响及干扰试验等作了试验和选择.方法的检出限为0.25 μg·L-1,在8 μg·g-1的水平上进行精密度试验,测得结果的相对标准偏差(n=10)为3.0%.

       

      Abstract: Cleaned and dried hair sample was dissolved with mixture acid of nitric acid and perchloric acid. The hydride generation of PbH4 and determination of lead content in the sample were performed automatically by the use of hyphenated instrumentation of the WHG-102A2 FI-Hydride generator and the GGX-9 Atomic absorption spectrometer. Optimum conditions of the determination,including the amount of K3Fe(CN)6 required,the temperature of atomization,the effect of HClO4 and the test for interfering substances,were studied. Detection limit of this method was found to be 0.25 μg·L-1. Precision of the method was tested at the concentration level of 8 μg·g-1,giving the value of RSD (n=10) of 3.0%.

       

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