有机修饰(土娄)土对CrO42-吸附特征的初步研究
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* 国家自然科学基金项目(40301021)资助


CrO42- ADSORPTION CHARACTERISTICS OF LOU SOILS MODIFIED WITH ORGANIC SUBSTANCES
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    摘要:

    以CTMAB(十六烷基三甲基溴化铵)单一修饰和CTMAB+SDS(十二烷基磺酸钠)混合修饰土耕层、粘化层土样,从修饰比例、土层、温度角度探讨了有机修饰土对CrO42-的平衡吸附特征。结果表明,各供试土样中CrO42-平衡吸附量均随CrO42-平衡浓度增高而增大,有机修饰土对CrO42-的吸附等温线呈现L型等温线形式,原土土样的吸附等温线基本上类似于S型吸附等温线形式,两层次各土样对CrO42-的吸附量呈现100CB>120CS>50CB>CK的顺序(100,120,50分别表示修饰比例为100,100+20,50;CB为CTMAB修饰;CS为CTMAB+SDS修饰;CK为未修饰原土);随着平衡浓度的增大,耕层原土对CrO42-的吸附能力增加较快而粘化层原土增加较慢,土粘化层修饰土样对CrO42-的平衡吸附量均高于土耕层土样,但修饰比例增高导致两层次土样对CrO42-吸附亲和力的差异减小;未修饰原土对CrO42-吸附呈现增温效应,粘化层CK土样增温效应高于耕层CK土样,表明增温促进粘粒矿物对CrO42-的专性吸附。随平衡浓度的增大,修饰土样CrO42-吸附温度效应比值均变化不大,耕层各修饰土样对CrO42-吸附呈现增温负效应,而粘化层修饰土样对CrO42-吸附的温度效应则与修饰剂和修饰比例有关。

    Abstract:

    From the angles of modification rate,soil layers,and temperature,CrO42- adsorption characterist ics were studied of the soil samples gathered from the tillage layer(TLLS)and clay layer of lou soil(CLLS)modified with cetyltrimethylammonium bromide(CTMAB)and cetyltrimethylammonium bromide+sodium dodecylsulphonate(CTMAB+ SDS)mixture at various rates.The results show that CrO42- equilibrium adsorption amounts(EAA)in the soil samples increased with the CrO42- equilibrium concentration;the adsorption isotherms appeared in the shape of L in the modified soils and of S in the unmodified soil.In terms of adsorption of CrO42- the soil samples from both layers were in the order of 100CB>120CS>50CB>CK.CrO42- adsorption in unmodified TLLS increased faster than that in unmodified CLLS with the increase in CrO42- equilibrium concentration.The EAA of CrO42- in modified CLLS were higher than that in modified TLLS,however,the difference in soil affinity to CrO42- between modified CLLS and modified TLLS decreased with the increase in modification rate.CrO42- adsorption in unmodified soils increases with the temperature,and the effect was stronger on unmodified CLLS than on unmodified TLLS,indicating increase in temperature promotes CrO42- special adsorption on clay mineral.The CrO42- adsorption rate from 20 to 40 on modified soils did not vary much with the increase in CrO42- equilibrium concentration.With rise in temperature,CrO42- adsorption on modified TLLS decreased while the CrO42- adsorption on modified CLLS was related to both modifier and modification rate.

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孟昭福,张一平,龚宁.有机修饰(土娄)土对CrO42-吸附特征的初步研究[J].土壤学报,2006,43(1):104-110. DOI:10.11766/trxb200411030115 Meng Zhaofu, Zhang Yiping, Gong Ning. CrO42- ADSORPTION CHARACTERISTICS OF LOU SOILS MODIFIED WITH ORGANIC SUBSTANCES[J]. Acta Pedologica Sinica,2006,43(1):104-110.

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  • 收稿日期:2004-11-03
  • 最后修改日期:2005-03-15
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  • 在线发布日期: 2013-02-25
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