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土壤中铬的化学行为研究Ⅴ.土壤对Cr(Ⅲ)吸附和沉淀作用的影响因素 被引量:32

STUDY ON CHEMICAL BEHAVIOR OFCHROMIUM IN SOILSV. FACTORS AFFECTING Cr(III) ADIJSORPTION ANDPRECIPITATION IN SOILS
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摘要 本试验研究了土壤、矿物对Cr(Ⅲ)的吸附和沉淀作用,结果表明:在pH4.0时,三种土壤对Cr(Ⅲ)的吸附量是青紫泥>黄筋泥>旱地红镶。Cr(Ⅲ)的吸附量和沉淀量之和随pH的变化曲线可分为四个区域。在Cr(Ⅲ)吸附或吸附一沉淀区域的pH范围内(pH<6.0),土壤对Cr(Ⅲ)的吸附分量随溶液中pH升高而减少,沉淀分量则随pH升高而增加;溶液中富啡酸和柠檬酸的存在可以增加Cr(Ⅲ)的沉淀量。 r(III) removal in solutions with different pH values was measured under con-ditions of adding and without adding soils and minerals. With pH increasing insoil solution, the amounts of Cr(III) removal by adsorption and precipitation incre-ased when pH < 10.5, but decreased when PH > 10.5. The curve of Cr(III) removalby soils and minerals could be divided into four ranges: (1) pH range of Cr(III)adsorption when pH < about 4.0, (2) pH range of Cr(III) adsorption-precipitationwhen pH 4-6, (3) pH range of Cr(III) stable precipitation when pH 6-10.5, and(4) pH range ol Cr(III) hydrolysis when PH > 10.5.Organic acids such as citric acid and fulvic acid existing in soils would raiseCr(III) dissolubility and stability in pH range of 4-7. The pH value causing pre-cipitation of fulvic acid-Cr(III) was about pH 7.0 and rose by 3 pH unites comparedwith that of Cr(III) precipitation. Whereas, little effect on Cr(III) dissolubility wasfound for humic acid existing in soil solution. The existence of phosphate in sol-ution would lower the PH value causing stable precipitation of Cr(III).The amounts of Cr(III) adsorbed by three soils at pH 4.0 followed the sequ-ence: stagnogleyed paddy soil > submergic paddy soil from red soil > upland redsoil.Cr(III) adsorption isotherms fit Langmuir and Freundlich equations in theniontmorillonite-Cr(III) system, but did not fit Langmuir and Freundlich equationsin the soil-Cr(III) system.
机构地区 浙江农业大学
出处 《土壤学报》 CAS CSCD 北大核心 1994年第1期77-85,共9页 Acta Pedologica Sinica
关键词 土壤 吸附作用 沉淀作用 Chromium (III), Soii adsorption, Precipitation, Soil Pollution.
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参考文献7

  • 1夏增禄.北京地区铬的土壤化学地理[J].地理学报,1989,44(4):449-458. 被引量:8
  • 2陈英旭,环境科学学报,1989年,9卷,3期,137页
  • 3罗勤慧,中国科学.B,1986年,2期,137页
  • 4庄源益,环境化学,1985年,4卷,6期,61页
  • 5朱月珍,土壤学报,1985年,22卷,4期,390页
  • 6周家义,海洋与湖沼,1980年,11卷,3期,30页
  • 7Jan T K,J Water Pollut Control Fed,1978年,50卷,2326页

二级参考文献4

  • 1夏增禄,土壤环境容量及其应用,1988年
  • 2夏增禄,环境地球化学进展,1986年
  • 3团体著者,环境科学学报,1985年,5卷,1期,113页
  • 4夏增禄,生态学报,1983年,3卷,3期,277页

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