| 恒电荷土壤胶体表面的电荷特征 |
| |
| 引用本文： | 杨亚提,张一平,张兴福.恒电荷土壤胶体表面的电荷特征[J].西北农林科技大学学报(社会科学版),2002,30(1):47-51. |
| |
| 作者姓名： | 杨亚提 张一平 张兴福 |
| |
| 作者单位： | 1. 西北农林科技大学,生命科学学院
2. 资源环境学院,陕西,杨陵,712100 |
| |
| 基金项目： | 国家自然科学基金资助项目(79770074) |
| |
| 摘 要： | Mehlich法和电位滴定法研究表明 ,供试土壤胶体可变电荷量占总电荷量 (CECv/ CEC8.2 )的比例为33.6 4%～ 35 .5 8%;表面电荷量 CEC8.2 ,CECp 和 CECv 的大小次序为土娄土 >黄绵土 >黑垆土 >黄褐土 ;电荷零点(PZC)大小与此顺序相反 ;同一土壤胶体其 PZC大小呈 Ca(NO3 ) 2 >KCl>Na NO3 的趋势 ,在 Na2 SO4介质中不存在 PZC。各土壤胶体负电荷密度随 p H增加的幅度即为 p H对土壤胶体表面电荷密度的贡献率 (简称为 p H贡献率 ) ,增加的幅度愈大 ,表明 p H对表面负电荷密度的贡献率愈大。 p H贡献率的大小呈黄绵土 >黑垆土 >土娄土 >黄褐土的趋势 ;同一土壤胶体 ,p H的贡献率基本上呈现 KCl>Na2 SO4>Ca(NO3 ) 2 >Na NO3 。
|
| 关 键 词： | 恒电荷土壤胶体 电荷零点 电位滴定 电荷密度 |
| 文章编号： | 1000-2782(2002)01-0047-05 |
| 收稿时间： | 1/8/2001 12:00:00 AM |
| 修稿时间： | 2001年1月8日 |
Charge characteristics of constant charge soil colloids |
| |
| YUAN Xiao ling,YUAN Xiao qun.Charge characteristics of constant charge soil colloids[J].Journal of Northwest Sci-Tech Univ of Agr and,2002,30(1):47-51. |
| |
| Authors: | YUAN Xiao ling YUAN Xiao qun |
| |
| Institution: | 2 (1 College of Life Sciences;2 College of Resources and Environment,Northwest Sci-Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100,China) |
| |
| Abstract: | Mehlich and potentiometric titration methods showed that specific value of varible negative charge to total negative charge (CEC v/CEC 8.2 ) was between 33.64% to 35.58%,the sequence of CEC 8.2 ,CEC p and CEC v was:old manured loessal soil>yellow loessal soil>dark cultivated loessal soil>yellow cinamon soil,the sequence of PZC was opposition with negative charge.In different eletrolytes,PZC of same soil colloid showed the trend of Ca(NO 3) 2>KCl>NaNO 3.The increasing slope of negative charge density with pH increasing was expressed with the pH contribution rate,the pH contribution rate of different soil colloids showed in the sequence that yellow loessal soil>dark cultivated loessal soil>old manured loessal soil>yellow cinamon soil,in different eletrolytes,pH contribution rate of same soil colloid showed the trend of KCl>Na 2SO 4>Ca(NO 3) 2>NaNO 3. |
| |
| Keywords: | constant charge soil colloid the point of zero charge potentiometric titration charge density |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《西北农林科技大学学报(社会科学版)》浏览原始摘要信息 |
| 点击此处可从《西北农林科技大学学报(社会科学版)》下载免费的PDF全文 |
|
