| 原子吸收硫化锌法间接测定半胱氨酸络合反应的机理研究 |
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| 引用本文： | 刘文涵,单胜艳,张丹,吴小琼. 原子吸收硫化锌法间接测定半胱氨酸络合反应的机理研究[J]. 光谱学与光谱分析, 2005, 25(10): 1717-1719 |
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| 作者姓名： | 刘文涵 单胜艳 张丹 吴小琼 |
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| 作者单位： | 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 310032 |
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| 基金项目： | 浙江省分析测试基金（03053,04128）资助 |
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| 摘 要： | 通过编程计算半胱氨酸和锌离子在不同pH条件下的各种存在形式，通过分析拟合分布图，研究了硫化锌法原子吸收间接测定半胱氨酸时的pH对原子吸收的影响及络合反应的机理。经对不同形态的半胱氨酸与金属锌离子的共存区域的各种离子的组合探讨，发现在最佳测定条件下的半胱氨酸是以负一价荷电形态的半胱氨酸基Cys-与Zn(OH)2形成了可溶性络合离子２Zn(OH)２。结果表明，理论分析计算的结果与实验数据得到了很好的吻合。
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| 关 键 词： | 火焰原子吸收光谱法 半胱氨酸 间接测定 ZnS 机理研究 |
| 文章编号： | 1000-0593(2005)10-1717-03 |
| 收稿时间： | 2004-02-19 |
| 修稿时间： | 2004-05-28 |
Studies of Complexing Action Mechanism in Indirect Determination of Cysteine by FAAS with ZnS |
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| LIU Wen-han,SHAN Shen-yan,ZHANG Dan,WU Xiao-qiong. Studies of Complexing Action Mechanism in Indirect Determination of Cysteine by FAAS with ZnS[J]. Spectroscopy and Spectral Analysis, 2005, 25(10): 1717-1719 |
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| Authors: | LIU Wen-han SHAN Shen-yan ZHANG Dan WU Xiao-qiong |
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| Affiliation: | State Key Laboratory，Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, China |
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| Abstract: | Each state of cysteine and zinc ion in aqueous solution at different pH conditions was calculated by computer,giving out the distribution curve.The mechanism of complexing action in indirectly determining cysteine by flame atomic absorption spectrometry with ZnS,and the influence of solution pH were studied.The state of cysteine and zinc ion in aqueous solution at different pH is different.The reason for forming the peak is the change of concentration of cysteine and zinc ion at different pH.The soluble complexing ion is composed of-1 valence cysteine Cys~-and Zn(OH)_2.The theoretical analysis is well conformable with the data determined from the experiments.The structure of complexing ion is [HS-CH_2CH(NH_2)-COO]_2Zn(OH)_2. |
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| Keywords: | Flame atomic absorption spectrometry Cysteine Indirect determinationl ZnS, Mechanism investigation |
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