微波消解石墨炉原子吸收法测定人发中的铅、镉

Determination of Lead and Cadmium in Human Hair by GFAAS with Microwave Digested Samples

摘要: 采用石墨炉原子吸收分光光度法（GFAAS）测定人发中的铅、镉含量.采用微波消解法消解样品，加入(NH₄)₂SO₄+KH₂PO₄基体改进剂消除干扰，对消化剂种类、消解压力、仪器条件等进行了探索.方法简便、准确度高，Pb和Cd的平均回收率分别为101.8%和107.1%，相对标准偏差（RSD）为5.14%和6.80%，方法检出限Pb为9.53 ng/mL，Cd为0.78 ng/mL.

Abstract: Pb and Cd in human hair were determined by graphite furnace atomic absorption spectrometry. The samples were digested by microwave with (NH₄)₂SO₄ plus KH₂PO₄ as the modifier to eliminate the matrix interference. The type of digestant, digesting pressure and instrument parameter were studied. The method is simple and accurate. The average recoveries were 101.8% and 107.1% for Pb and Cd, respectively, and the relative standard deviations were 5.14% and 6.80%, and the detection limits were 9.53 ng/mL and 0.78 ng/mL.