硫化锌法原子吸收间接测定半胱氨酸锌络合物稳定常数  

Determination of Stability Constant of Zinc Cysteinate by Indirect Determination Using FAAS with ZnS

作　　者：刘文涵[1] 单胜艳[1] 张丹[1] 马淳安[1] 

机构地区：[1]浙江工业大学化材学院绿色化学合成技术国家重点实验室培育基地分析测试中心,浙江杭州310014

出　　处：《光谱学与光谱分析》2005年第11期1872-1874,共3页Spectroscopy and Spectral Analysis

基　　金：浙江省分析测试基金(编号:03053;04128)资助

摘　　要：利用硫化锌法原子吸收间接测定半胱氨酸时,在最佳测定酸度条件下,所形成的络合物半胱氨酸锌的稳定常数,进行数值测定和理论求解获得了成功:在最佳酸度pH=9.7时的碱式半胱氨酸锌的稳定常数在2.998×1030到3.858×1030之间,平均值为β稳=3.286×1030,标准偏差为0.315×1030,其logβ稳=30.517。半胱氨酸锌的稳定常数在7.853×1021到1.011×1022,平均值为β稳=8.607×1021,标准偏差为0.315×1021,其logβ稳=21.935。表明原子吸收光谱不仅可用于微量元素的测定和有机化合物的间接测定,也可以进行络合离子的物理形态、物理常数的研究和测定。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 pH9.7, the stability constant of alkalescence zinc cysteinate is between 2.998×10^30 and 3.858×10^30, with the average value βw=3.286×10^30 and logβw = 30. 517, and the standard deviation is 0.315×10^30. While the stability constant of zinc cysteinate is between 7.853 × 10^21 and 1.011 × 10^22, with the average value βw = 8.607×10^21 and logβw = 21.935, and the standard deviation is 0.315 × 10^21 . 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.

关 键 词：火焰原子吸收光谱法 半胱氨酸锌 间接测定 络合平衡 稳定常数 

分 类 号：O657.3[理学—分析化学]