鉛、鎘在典型植煙土壤中的吸附-解吸特性及環(huán)境風(fēng)險(xiǎn)評(píng)估.pdf

《鉛、鎘在典型植煙土壤中的吸附-解吸特性及環(huán)境風(fēng)險(xiǎn)評(píng)估.pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在工程資料-天天文庫(kù)。

1、煙草科技／T0baccoScience＆Technology煙草農(nóng)學(xué)／TobaccoAgronomy2010年第3期(總第272期)鉛、鎘在典型植煙土壤中的吸附一解吸特性及環(huán)境風(fēng)險(xiǎn)評(píng)估楊欣，陳江華，張艷玲，尹啟生，張仕祥1．中國(guó)煙草總公司鄭州煙草研究院，鄭州高新技術(shù)產(chǎn)業(yè)開發(fā)區(qū)楓楊街2號(hào)4500012．中國(guó)煙葉公司，北京市西城區(qū)月壇南街55號(hào)100045關(guān)鍵詞：鉛；鎘；煙草；土壤；吸附；解吸摘要：以我國(guó)主要產(chǎn)煙區(qū)4種典型植煙土壤(紅壤、水稻土、黃壤、褐土)為試材，采用一次平衡法研究了外加鉛、鎘在植煙土壤中的吸附一解吸行為，并利用保留因子對(duì)鉛、鎘在4種土壤中的環(huán)境風(fēng)險(xiǎn)

2、進(jìn)行了評(píng)估。結(jié)果顯示：4種植煙土壤對(duì)鉛、鎘的吸附存在很大差異，褐土對(duì)鉛、鎘的吸附能力最強(qiáng)，其次是黃壤，水稻土和紅壤的吸附能力則較弱。除褐土對(duì)鎘的吸附外，4種植煙土壤對(duì)鉛、鎘的吸附均可用Lang．muir及Freundlich方程擬合。在競(jìng)爭(zhēng)吸附條件下，鉛、鎘的平均分配系數(shù)均下降，下降率分別為l4％～34％和8％～25％，鉛的存在明顯抑制了土壤對(duì)鎘的吸附，鎘對(duì)鉛的影響較小，鉛、鎘吸附量在水稻土和紅壤中下降幅度更大。隨土壤中鉛、鎘含量的增加，環(huán)境風(fēng)險(xiǎn)呈幾何級(jí)數(shù)增加，4種土壤中，兩元素在水稻土和紅壤中的潛在環(huán)境風(fēng)險(xiǎn)更大。中圖分類號(hào)：$572．06文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：

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