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石墨炉原子吸收测定易挥发性痕量元素时,往往在原子化以前的灰化阶段即挥发损失以致分析结果偏低。同时又由于允许的灰化温度较低,样品中的基体不能驱尽,因此在原子化阶段产生严重的背景吸收。为消除这类干扰,文献报道采用基体改进技术,即在待测样品溶液中或在石墨炉中加入某种化学试剂,将待测元素转变为较稳定的化合物,从而有利于提高灰化温度,防止灰化损失和消除基体干扰。我们已应用微克量钯作为基体改进剂测定废水中痕量汞和海水中铅。
Graphite furnace atomic absorption measurement of volatile trace elements, often in the atomization of the ash phase before the volatilization loss that the results of the analysis is low. At the same time, because the ashing temperature allowed is low, the matrix in the sample can not be driven out and therefore produces a serious background absorption during the atomization phase. To eliminate such interference, the literature reports the use of matrix modification technology, that is, in the sample solution to be measured or in a graphite furnace by adding a chemical reagent, the elements to be tested into more stable compounds, which help to improve the ashing temperature, Prevent ashing loss and eliminate matrix interference. We have applied micrograms of palladium as a matrix modifier for the determination of trace mercury and seawater lead in wastewater.