红壤对铬(VI)吸附特性的研究

Absorption Behavior of Chromium(VI) in Red Soils

通过云南三类红壤对Ｃｒ（ＶＩ）吸附行为的研究。结果表明，红壤对Ｃｒ（ＶＩ）有明显的吸附作用，等温吸附曲线可以用Ｆｒｅｕｎｄｌｉｃｈ方程、Ｌａｎｇｍｕｉｒ方程和Ｔｅｍｋｉｎ方程描述。最大吸附量为红壤＞赤红壤＞砖红壤。酸度、温度和有机质对红壤吸附Ｃｒ（ＶＩ）均有影响。低ｐＨ值时吸附量随ｐＨ值升高略有增加，ｐＨ值超过某一限度，吸附量急剧下降，直至基本不吸附；温度低于４０℃时，吸附量随温度升高而减少，但温度高于４０℃时，吸附量不再减少；随有机质加入量的增加，吸附量减少，其相关性红壤和赤红壤达显著水准，砖红壤达极显著水准。

Three kinds of red soils in Yunnan were studied for their chromiumn(VI) absorption behavior,as a result,the chromium(VI) adsorpted by red soils and their isotherms absorption might be described by Freundlich,Langmuir and Temkin equation.The maximum chromium(VI) adsorbing amounts were:red soil〉lateritic red soil〉Laterite.Acidity,tempurature and organic matter would affect adsorbing process.At low pH value,the chromiun(VI) adsorbing amounts would increase while pH value was raised.When pH value exceeded to a certain limit,the chromium(VI) adsorbing amounts would sharply declined until the completion of absorption process.At lower temperature than 40℃,the chromium(VI) adsorbing amounts would decrease with the raising temperature,but when the temperature exceeded 40℃,the chromium(VI) adsorbing amounts would not decrease more.Chromium(VI) adsorbing amounts would decrease as affected with increasing amount of organic matter.Correlation on red soil and Lateritic red soil was signifiance,especially extremely significant on laterite.