| 摘要: |
| 用离子交换平衡法测定了陕西主要土壤塿土、黑垆土、黄绵土胡敏酸－铜络合物的稳定常数。结果表明：胡敏酸－铜络合物的ｌｏｇK呈：黑垆土＞塿土＞黄绵土的趋势；ｐＨ值从４．０～７．０，ｌｏｇK值均递增；离子强度（I）从０．００～０．１０，温度（T）从２９８Ｋ～３１３Ｋ，ｌｏｇK值均减小；络合反应热力学函数变化△rGmθ＜0，△rHmθ＜0，△rSmθ＜0；配位数（x）为非整数，此络合物属多点位络合。黄绵土胡敏酸－铜络合物具有环境变异稳定性。 |
| 关键词: 胡敏酸，胡敏酸－铜络合物，离子交换平衡法，热力学特性 |
| DOI： |
| 分类号:S153.6 |
| 基金项目: |
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| The Stability of Copper-Humic Acid Complexes and Thermodynamics Characteristics |
|
Yang Yati Zhang Yiping Bei Jingling Tian Binbin,Yang Yati Zhang Yiping Bei Jingling Tian Binbin,Yang Yati Zhang Yiping Bei Jingling Tian Binbin
|
| Abstract: |
| Stability constant of copper-humic acid complexes in three kinds of
Shaanxi soils:old manuredred loessal soil,dark cultivated loessal soil and yellow loessal
soil were determined using cation-exchange equilibrium method.The results showed that
Log K of copper-humic acid complexes appeared to be in the tendency:dark cultivated
loessal soil>old manured red loessal soil>yellow loessal soil;and that pH value was
4.0 to 7.0;log K value increased in succession;I value of cation intensity was 0.00 to
0.10;T value was 298 K to 313 K;Log K value decreased.The thermodynamic function
variations in complex reactions were:△rGmθ＜0，△rHmθ＜0，△rSmθ＜0.The value of x was a
non-integer.The complex belongs to the one with more complexing sites.Thus,yellow
loessal soil copper-humic acid complexes have the environmental variation stability. |
| Key words: Humic acid ,copper-humic acid complexes ,cation-exchange equilibrium method ,thermodynamic characteristics |
