空气-乙炔火焰原子吸收法测钙时某些有机络合剂的增感效应

Enhancement Effects of Some Organic Complexing Agents on Atomic Absorption Spectrometry of Calcium Using Air-Acetylene Flame

摘要: 本文考察了二十种常用有机合物钙吸光度的影响,结果表明:四种脂肪酸对钙的吸收信号有抑制作用;而其它试剂都有不同程度的增感作用,其中以磺基水扬酸的增感作用最大。
较全面地研究了磺基水场酸对空气-乙炔火焰原子吸收测钙的影响,发现磺基水扬酸不但可作为钙的增感剂,同时又是干扰抑制剂,尤其适用于钢铁中钙的测定,回收实验结果较满意。并对有关机理进行了初步探讨。

Abstract: The effects of the twenty organic complexing agents on the absorbance of calcium in AAS by air-acetylene flame are examined. The atomic absorption signals for Ca are enhanced by all agents added except four ali-phatic acids,especially sulphosalicylic acid(SS) is the most remakable.The effects of SS on calcium absorption are investigated in detail. The mechanism of the enhancement and suppression effects are explored preliminarily.
In the presence of 0.1M SS, with increasing the absorbance of Ca to about150%,the interference of some ions is suppressed partly, so that the linearity of calibration curves is improved.
It is revealed that sulphosalicylic acid acts not only as an atomic absorption enhancer but also as an interference suppressor in the determination of calcium by air-acetylene flame AAS. The results obtained for artificial steel samples are satisfactory.