石墨炉原子吸收分光光度法测定空气中的铍

Determination of Beryllium in Air by Graphite Furnace Atomic Absorption Spectrometric Method

对300余个样品进行监测,选择灵敏度高的石墨管和最佳基体,提高灰化、原子化的温度,确立了石墨炉原子吸收法测定空气中铍含量的实验条件。样品采用干灰化消解法,最佳溶剂为质量分数1%的硝酸溶液,利用仪器内置的样品浓度计算程序,绘制工作曲线直接获得样品中铍的含量。方法检出限为0.021μg/L,测定结果的相对标准偏差小于2%(n=6),线性范围为0～6.5μg/L,加标回收率为91.6%～107%。

By monitoring more than 300 samples, with a high sensitivity of the graphite tube, the best base, elevated ashing and atomization temperature, stable experimental conditions for determining beryllium in air by graphite furnace atomic absorption spectrometric method were established. The sample was digested by dry ashing method with the best solvent of 1% nitric acid, the content of beryllium in samples was determined by using calculation of sample concentration procedure of instruments to make the calibration curve. According to the selected experimental conditions, the detection limit was 0.021 μ g/L, the relative standard deviation of the test results was less than 2%（n=6）, the linear range was 045.5 μ g/L, and the recoveries were 91.6% -107%.