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本文以钍与偶氮胂Ⅲ显色体系为例,用三阶导数零点法作了研究并应用于岩矿中微量钍的测定。60μg/ml以下的稀土其三阶导数吸收线在665nm处通过基线,记录665nm处钍配合物三阶导数吸收值,0～1.25μg/ml成线性关系,存在200倍稀土可不必分离。
In this paper, thorium and arsenazo Ⅲ color system as an example, with the third derivative zero point method was applied to the determination of trace amounts of thorium in rock and mine. The third derivative absorption line of rare earth below 60μg / ml passes the baseline at 665nm and the third derivative of thorium complex at 665nm is recorded. There is a linear relationship of 0-1.25μg / ml. There is no need to separate 200 times rare earth.