Abstract：On the bases of exploring measurement mechanism and complex compound components of indirect determination of cysteine acid by flame atomic absorption spectrometry with zinc sulfide, the stability constants of the complex compound of zinc cysteinate were studied successfully, after the numeric measurements and theoretical investigations under the best optimized acidity for the determination. In conclusion, at the best optimized acidity pH 9.7, the stability constant of alkalescence zinc cysteinate is between 2.998×1030 and 3.858×1030, with the average value βW=3.286×1030 and logβW＝30.517，and the standard deviation is 0.315×1030. While the stability constant of zinc cysteinate is between 7.853×1021 and 1.011×1022, with the average value βW=8.607×1021 and logβW=21.935，and the standard deviation is 0.315×1021. It is shown that the atomic absorption spectrometry can not only be used for the determination of trace elements and the indirect determination of organic compound, but also can carry out the study of physical configuration and the determination of physical constant of complex ion.
刘文涵，单胜艳，张 丹，马淳安. 硫化锌法原子吸收间接测定半胱氨酸锌络合物稳定常数[J]. 光谱学与光谱分析, 2005, 25(11): 1872-1874.
LIU Wen-han, SHAN Sheng-yan, ZHANG Dan, MA Chun-an. Determination of Stability Constant of Zinc Cysteinate by Indirect Determination Using FAAS with ZnS . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(11): 1872-1874.
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