| 草炭水溶解态有机质与金属离子络合稳定常数的测定 |
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| 引用本文： | 蒋疆,王果,陈芳育.草炭水溶解态有机质与金属离子络合稳定常数的测定[J].福建农林大学学报(自然科学版),2002,31(1):131-134. |
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| 作者姓名： | 蒋疆 王果 陈芳育 |
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| 作者单位： | 1. 福建农林大学生命科学学院
2. 福建农林大学资源与环境学院,福建,福州,350002 |
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| 基金项目： | 国家自然科学基金资助项目 (4 96710 48) |
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| 摘 要： | 采用离子交换平衡法测定草炭水溶解态有机质与 Cu2 +、Pb2 +、Zn2 +、Cd2 + 4种金属离子 ,在 2种 p H条件下的络合稳定常数 .结果表明 ,金属离子与草炭水溶解态有机质通常形成混合或多核络合物 ;2种 p H条件下的络合配位数和稳定常数序列均为 :Cu2 + >Pb2 + >Zn2 + >Cd2 + ,高 p H条件下 ,络合配位数和稳定常数均明显增大
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| 关 键 词： | 水溶解态有机质 金属离子 稳定常数 配位数 |
| 文章编号： | 1006-7817(2002)01-0132-03 |
| 修稿时间： | 2001年7月4日 |
Determination of the stability constants of complexing between the water-so luble-organic-matter of peat and the metal ions |
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| JIANG Jiang ,WANG Guo ,CHEN Fang yu.Determination of the stability constants of complexing between the water-so luble-organic-matter of peat and the metal ions[J].Journal of Fujian Agricultural and Forestry University,2002,31(1):131-134. |
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| Authors: | JIANG Jiang WANG Guo CHEN Fang yu |
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| Institution: | JIANG Jiang 1,WANG Guo 2,CHEN Fang yu 2 |
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| Abstract: | Ion exchange equilibrium method was used to determine the stability constants of the complexes formed by the water soluble organic matter (WSOM) of peat and four different ions under two pH conditions. When I=0.1, pH=3.5, the order of the coordination numbers x was Cu 2+ (0.92)>Pb 2+ (0.59)>Zn 2+ (0.33)>Cd 2+ (0.18), and the order of stability constants was Cu 2+ ( 3.31)> Pb 2+ (1.57)>Zn 2+ (0.73)>Cd 2+ (0.37). When I=0.1, pH=5.0, the order of the coordination numbers x was Cu 2+ (1.42)>Pb 2+ (0.65)>Zn 2+ (0.34)>Cd 2+ (0.25), and the order of stability constants was Cu 2+ (4.71)>Pb 2+ (1.26)>Zn 2+ (0.79)>Cd 2+ (0.47). Metal ions and WSOM usually formed mixed or polynuclear complexes. Under high pH condition, there was a remarkable increase in coordination numbers and stability constants. |
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| Keywords: | water soluble organic matter metal ion stability constants coordination number |
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