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本文介绍采用发射光谱法,将粉末样品直接倒入石墨室电极中,以直流电弧为光源,靠电极的热传导使试样缓慢升温,充分利用汞的分馏效应,实现汞与基体元素的有效分离,测定下限达到0.01ppm。单次摄谱RSD为9.7%。对影响汞谱线强度的因素,如样品组成,烘样时间,电流强度,上电极形状等进行了对比试验。发现汞的测定不受样品组分的影响。曾用该法进行了上万个地质、土壤、环保等样品的测定,都获得了比较满意的结果。方法快速、简便、经济,适用于生产中大批量分析任务。
This article describes the use of emission spectroscopy, the powder sample directly into the graphite chamber electrode, the DC arc as a light source, the electrode by the heat conduction so that the sample slowly warming up, make full use of mercury fractionation effect, the effective separation of mercury and matrix elements, The lower limit of measurement reached 0.01 ppm. The single-spectrum RSD was 9.7%. Factors affecting the intensity of the mercury line, such as the composition of the sample, the drying time, the current intensity, the shape of the upper electrode were compared. The mercury was found to be unaffected by the sample components. Have used this method for tens of thousands of geological, soil, environmental protection and other samples were measured, have been more satisfied with the results. The method is fast, simple and economical, suitable for mass production of analytical tasks.