| 三种紫色土表面电荷性质的研究 |
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| 引用本文： | 杨兴伦,李航. 三种紫色土表面电荷性质的研究[J]. 土壤学报, 2004, 41(4): 577-583 |
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| 作者姓名： | 杨兴伦 李航 |
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| 作者单位： | 西南农业大学资源环境学院,重庆,400716 |
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| 摘 要： | 采用恒流置换法测定了酸性、中性、石灰性紫色土表面电荷总量、表面电位、表面电荷密度、表面电场强度以及比表面积 ,并讨论了电解质浓度、类型、环境温度以及pH对这些电性参数的影响。结果表明 :(1)在 2∶1型电解质体系 (Mg(NO3 ) 2 )中 ,三种紫色土的表面电位分别约为 - 0 .16～ - 0 .18V、- 0 .17～- 0 .19V、 - 0 .18～ - 0 .19V ;表面负电荷密度分别为 - 0 .2 6～ - 0 .4 4Cm-2 、- 0 .37～ - 0 .5 9Cm-2 、- 0 .5 8～ - 0 .6 7Cm-2 ;(2 )随电解质浓度的增加 ,三种紫色土的表面电位的负值都表现出下降的趋势 ,而表面电荷密度负值则表现出稍微增加趋势 ;(3)在 2∶1型电解质体系中三种紫色土的表面电位都约为在 1∶1型电解质体系 (KNO3 )中的一半 ,而表面电荷密度、表面电场强度和比表面积则在两种体系中基本相等 ;(4 )随温度的升高 ,三种紫色土的表面电位的负值、表面电荷密度负值都表现出减少的趋势
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| 关 键 词： | 紫色土 表面电位 表面电荷密度 |
| 收稿时间： | 2003-08-15 |
| 修稿时间： | 2003-12-29 |
SURFACE CHARGE PROPERTIES OF ACIDIC, NEUTRAL AND CALCAREOUS PURPLISH SOILS |
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| Yang Xinglun and Li Hang. SURFACE CHARGE PROPERTIES OF ACIDIC, NEUTRAL AND CALCAREOUS PURPLISH SOILS[J]. Acta Pedologica Sinica, 2004, 41(4): 577-583 |
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| Authors: | Yang Xinglun and Li Hang |
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| Affiliation: | College of Resources and Environment, Southwest Agriculture University, Chongqing 400716, China;College of Resources and Environment, Southwest Agriculture University, Chongqing 400716, China |
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| Abstract: | All the physical and chemical properties of soil are ascribed to surface charge of soil particles.Many processes taking place in the soil system are influenced by surface charge.Therefore,parameters of its electrochemical properties,especially the surface potent ial and the surface charge density,are of the most importance.However,there is no reliable method available in accurately determining these parameters until recently.Li Hang solved this issue in his study by deducing the relationship between average potential and surface potential in the double layer.By using his method,surface charge properties of acidic,neutral and calcareous purplish soils were studied in this paper.The total charge volume,surface potential,surface charge density,electric field strength on surface and SSA(specific surface area) were determined.The effect of electrolyte concentration,cation variety,temperature and pH on the surface charge properties was also studied.The experimental results show that:(1) in 2B1 type electrolyte system(Mg(NO3) 2),the surface potential is-0.16~-0.18 V,-0.17~-0.19 V and -0.18~-0.19 V and the surface charge density is -0.26~-0.44 cm-2,-0.37~-0.59 cm-2 and -0.58~ -0.67 cm-2 for acidic,neutral and calcareous purple soil samples,respectively;(2) the surface potential of the samples decreases with the electrolyte concentration increasing,but the surface charge density,and the electric field strength increase slowly;(3) the surface potential in 2:1 type electrolyte system is about 50 percent as much as the one in 1:1 type(KNO3),however,there is little difference found in the surface charge density,the electric field strength and SSA between the two types of electrolyte system;(4) the surface potential,surface charge density and electric strength decrease with the temperature rising. |
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| Keywords: | Purple soil Surface potential Surface charge density |
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