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本文建立了用钯和抗坏血酸作基体改进剂石墨炉原子吸收法直接测定环境样品和水系沉积物中铊的方法。基体改进剂存在时,铊的灰化温度增至850℃,且无基体干扰,能定量回收加入的标准铊。所测得的结果与标准样品的标准值一致。此外,还讨论了高氯酸及其盐的干扰机理。若只有钯存在时,3.6ng铊的原子吸收随高氯酸浓度的增加而减小,0.1M高氯酸存在时,铊的原子吸收信号下降80%以上。然而,若加入抗坏血酸和钯,高氯酸在浓度为0.0001—0.5M无明显千扰。
This paper established a method for the direct determination of thallium in environmental samples and sediments by graphite furnace atomic absorption spectrometry with palladium and ascorbic acid as matrix modifier. In the presence of a matrix modifier, thallium ashing temperature increased to 850 ° C, and no matrix interference, quantitative recovery of added standard thallium. The measured result is in accordance with the standard value of the standard sample. In addition, the interference mechanism of perchloric acid and its salts was also discussed. At palladium only, the atomic absorption of 3.6 ng of thallium decreased with the increase of the concentration of perchloric acid. At 0.1 M perchloric acid, the atomic absorption signal of thallium decreased by more than 80%. However, with addition of ascorbate and palladium, no significant interference with perchloric acid was observed at concentrations of 0.0001-0.5 M.