火焰原子吸收光谱法测定除尘灰中的钾钠锌铅

Determination of potassium,sodium,zinc and lead in dedusting ash by flame atomic absorption spectrometry

采用试样经灰化后再溶解的方法，解决了除尘灰中碳含量过高而溶样困难的问题；同时采用原子吸收光谱法将4种元素分开测定改进为连续测定，简化了分析步骤。将灰化后的试样，用HCl-HNO3-HF-HClO4混酸溶解，以SrCl2为释放剂，采用工作曲线法建立了火焰原子吸收光谱法连续测定除尘灰中钾、钠、锌、铅4种元素。对样品的处理方法、仪器的分析条件、酸度介质及其浓度的选择、干扰的测定及消除等进行了试验，建立了一套系统的连续测定多元素的分析方法，用于样品的分析，相对标准偏差在0．98％～3．9％之间，加标回收率大于96％。

The dedusting ash sample was dissolved after ashing, solving the problem of difficult sample preparation caused by high content of carbon in dedusting ash. Meanwhile, the separate determination of four elements was improved to continuous determination by flame atomic absorption spectrometry, which simplified the analytical procedure. The ashed samples were dissolved in mixed acid （HCl- HNO3-HF-HClO4）. Then, four elements including potassium, sodium, zinc and lead in the solution were continuously determined by flame atomic absorption spectrometry through establishing the working curve with SrCl2 as releasing agent. The sample treatment method, the analytical conditions of instrument, the selection of acid medium and concentration, the determination and elimination of interference were investigated to establish a kind of systemic analytical method for continuous determination of multi-elements. This method was applied to the analysis of sample, and the relative standard deviation （RSD） was 0.98 G-3.9 G and the standard addition recovery was more than 96%.