硫化锌法原子吸收间接测定谷氨酸锌络合物稳定常数

Determination of Stability Constant of Glutamate Zinc by Indirect Deter mination of FAAS with ZnS

在利用硫化锌法火焰原子吸收间接测定谷氨酸或谷氨酸钠,并对测定机理、络合物组成探讨的基础上,进一步对在最佳测定酸度条件下,所形成的络合物谷氨酸锌的稳定常数,进行了测定和求解获得了成功,在pH 9 0时的碱式谷氨酸锌的稳定常数在3 3×10 2 0 ～1 4×10 2 1 ,平均值为β稳=1 0 3×10 2 1 ,其logβ稳=2 1 0 13。谷氨酸锌的稳定常数在3 3×10 1 0 ～1 4×10 1 1 ,平均值为β稳=1 0 3×10 1 1 ,其logβ稳=11 0 13。

Based on indirect determination of glutamic acid by flame atomic absorption spectrometry with ZnS and the complexing action mechanism, the determination of stability constant of glutamate zinc was studied. Under the selected condition of pH 9. 0, the stability constant of glutamate zinc is between 3.3 x 10(20) and 1.4 x 10(21), the average value is beta(w) = 1. 03 x 10(21), and log beta(w) = 21.013.