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时间:2020-03-27
《铅、镉在典型植烟土壤中的吸附-解吸特性及环境风险评估.pdf》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、烟草科技/T0baccoScience&Technology烟草农学/TobaccoAgronomy2010年第3期(总第272期)铅、镉在典型植烟土壤中的吸附一解吸特性及环境风险评估杨欣,陈江华,张艳玲,尹启生,张仕祥1.中国烟草总公司郑州烟草研究院,郑州高新技术产业开发区枫杨街2号4500012.中国烟叶公司,北京市西城区月坛南街55号100045关键词:铅;镉;烟草;土壤;吸附;解吸摘要:以我国主要产烟区4种典型植烟土壤(红壤、水稻土、黄壤、褐土)为试材,采用一次平衡法研究了外加铅、镉在植烟土壤中的吸附一解吸行为,并利用保留因子对铅、镉在4种土壤中的环境风险
2、进行了评估。结果显示:4种植烟土壤对铅、镉的吸附存在很大差异,褐土对铅、镉的吸附能力最强,其次是黄壤,水稻土和红壤的吸附能力则较弱。除褐土对镉的吸附外,4种植烟土壤对铅、镉的吸附均可用Lang.muir及Freundlich方程拟合。在竞争吸附条件下,铅、镉的平均分配系数均下降,下降率分别为l4%~34%和8%~25%,铅的存在明显抑制了土壤对镉的吸附,镉对铅的影响较小,铅、镉吸附量在水稻土和红壤中下降幅度更大。随土壤中铅、镉含量的增加,环境风险呈几何级数增加,4种土壤中,两元素在水稻土和红壤中的潜在环境风险更大。中图分类号:$572.06文献标识码:A文章编号:
3、1002—086l(20l0)03—0046—05Adsorption-DesorptionBehaviorsandEnvironmentalRiskAssessmentofLead,CadmiuminTypicalTobaccoGrowingSoilsYANGXIN(1),CHENJIANG-HUA(2),ZHANGYAN—LING(1),YINQI—SHENG(1),andZHANGSHI—XIANG(1)1.ZhengzhouTobaccoResearchInstituteofCNTC,Zhengzhou450001,China2.ChinaNational
4、LeafTobaccoCorporation,Beijing100045,ChinaKeywords:Pb;Cd;Tobacco;Soils;Adsorption;DesorptionAbstract:Takingred,paddy,yellowandcinnamonsoils,whicharetypicalinmajortobaccogrowingareasinChina,asexperimentalmaterial,thePbandCdadsorption—desorptionbehaviorsofthesesoilsampleswereinvestigate
5、dwithlinearequilibriummethodandtheenvironmentalriskofthepresenceofPbandCdinthesesoilswasassessedwithretentionfactors.TheresultsshowedthatPbandCdadsorptiondifferedsignificantlybetweenthesoilsampleswithhighestadsorptioncapacityofcinnamonsoil,followedbyyellowsoil,tailedbypaddysoilandreds
6、oil.ThePbandCdadsorptionintobaccogrowingsoilcouldbewelldescribedbyLangmuirandFreundlichequationwiththeexceptionofCdincinnamonsoil.ThemeandistributioncoefficientofCdandPbdecreasedby14%一34%and8%-25%,respectively,underacompetitivecondition,whichmeansthatthepresenceofPbobviouslyinhibitsCd
7、adsorption,whilethepresenceofCdimpartslesseffectsonPbadsorption;andPbandCdadsorptioninpaddysoilandredsoildroppedmoresharply.TheenvironmentalriskassessmentindicatedthattheenvironmentalriskwasmultipliedgeometricallywiththeincreaseofPbandCdcontentsinsoils,theirpresenceinpaddysoilandredso
8、ilwas
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