【摘要】 L-蛋氨酸是蛋白质水解的一种产物。在离子强度为0.14和温度为37±0.05℃下,测定了Hg（Ⅱ）-L、Cd（Ⅱ）-L、Pb（Ⅱ）-L 配合物的逐级生成常数,在水一脂肪醇（正辛醇）的体系中,各种金属配合物都存在于水层,但只有中性的ML₂分配于脂肪醇（正辛醇）中。用原子吸收分光光度法测定了以ML₂的形式分配于有机相中的汞、镉和铅的浓度。为评价以L-蛋氨酸预防汞、镉和铅中毒提供了化学依据。更多还原

【Abstract】 L-methionine（L）is a proteolytic product.The stepwise formation con-stants of Hg（Ⅱ）--L,Cd（Ⅱ）--L,and Pb（Ⅱ）--L coordinationcompounds were determined at constant ionic strength of 0.14 and tempera-ture 37±0.05℃.In the water--fatty alcohol（octanol）system,the variousmetal coordination compounds were found to be present in the aqueouslayer,only the neutral species ML₂ partitioned into the organic phase.Theconcentration of Mercury,cadmium and lead present in the ML₂ in the or-ganic phase were determined by atomic absorption spectrophotometry.Theyprovided a chemical evidence for evaluating the role of L-methionine in theprevention of mercury,cadmium and lead poisoning.更多还原