引用本文:朱玉艳,刘敏,桑彦彦.棕壤吸附-解吸铬影响因素研究[J].环境监控与预警,2011,3(04):47-50
.Study on influence factors of Adsorption - desorption of Chromium by Brown Soil[J].Environmental Monitoring and Forewarning,2011,3(04):47-50
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棕壤吸附-解吸铬影响因素研究
朱玉艳,刘敏1, 桑彦彦2
1.泰安市环境保护监测站,山东 泰安 271000;2.泰安市环境保护科学研究所,山东 泰安 271000
摘要:
采用室内实验方法,研究了不同铬浓度及不同pH对棕壤吸附-解吸铬的影响,草酸、EDTA和柠檬酸3种有机酸在不同浓度、不同pH条件下对棕壤吸附-解吸铬的影响。结果表明,棕壤对Cr6+的吸附率随其浓度的增大逐渐增大,并在酸性条件下易于吸附Cr6+,在碱性条件下易于解吸Cr6+,低浓度有机酸有利于棕壤对Cr6+的解吸。EDTA解吸率最大,草酸次之,柠檬酸最小。
关键词:    吸附-解吸  pH  有机酸  棕壤
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Study on influence factors of Adsorption - desorption of Chromium by Brown Soil
Abstract:
Adsorption-desorption of chromium by brown soil were studied in the laboratory by investigating the effect of concentrations of chromium, pH, and kinds of organic acids. The results showed that the rate of absorption of Cr6+ by brown soil increased with the increase of concentration of Cr6+. In addition, brow soil tended to absorb Cr6+ in acid conditions and desorb Cr6+ in alkaline conditions. Low concentration of organic acids helped desorbing Cr6+ by brown soil. The desorption rate was greatest in EDTA condition, followed by oxalic acid and citric acid.
Key words:  chromium  adsorption-desorption  pH  organic acids  brown soil