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在研究棕壤Zn2+吸附特征的基础上,进一步研究了草炭、猪粪和蚯蚓粪3种有机物料的不同分解产物对棕壤Zn2+吸附的影响。结果表明:Langmuir方程可用于描述棕壤对Zn2+的吸附特征。随温度升高棕壤对Zn2+的吸附量降低,热力学参数分析棕壤对Zn2+吸附的结果为△G<0、△H<0和△S<0的熵减自发反应过程。3种有机物料对Zn2+平衡吸附量影响顺序均大致为非水溶性分解产物>有机物料水溶性分解产物;草炭>猪粪>蚯蚓粪>CK。
Based on the study of Zn2 + adsorption in brown soil, the effects of different decomposition products of three organic materials, peat, pig manure and vermicompost, on Zn2 + adsorption on brown soil were further studied. The results show that Langmuir equation can be used to describe the adsorption characteristics of Zn2 + in brown soil. The adsorption of Zn2 + by brown soil decreased with increasing temperature. The results of thermodynamic parameters analysis indicated that the adsorption of Zn2 + on brown soil was entropy reduction by △ G <0, △ H <0 and △ S <0. The order of effect of three kinds of organic materials on the equilibrium adsorption of Zn2 + were mostly water - insoluble decomposition products> water - soluble decomposition products of organic materials; peat> pig manure> vermicompost> CK.