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1、農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào)2011,30(11)：2330-2335JournalofAgro—EnvironmentScience磷和硅在湖泊沉積物上的釋放特征及形態(tài)變化研究呂昌偉-，一，高際玫s，王維1，一，何江1，2，孫園園1，麻濤-，張細(xì)燕1，崔萌1，萬麗麗1(1．內(nèi)蒙古大學(xué)環(huán)境與資源學(xué)院，呼和浩特010021；2．內(nèi)蒙古大學(xué)環(huán)境地質(zhì)研究所，呼和浩特010021；3．內(nèi)蒙古環(huán)境監(jiān)測(cè)中心站，呼和浩特010011)摘要：以烏梁素海(WLSH)和岱海(DH)表層沉積物為吸附劑，開展了磷硅在2個(gè)湖泊沉積物卜的釋放
2、實(shí)驗(yàn)研究，同時(shí)采用連續(xù)提取法探討了釋放后的磷硅形態(tài)，變化。結(jié)果表明，磷和硅在2個(gè)湖泊沉積物上的釋放行為均可用Elovieh方程描述；0—20min為磷的快速釋放階段，此時(shí)段內(nèi)約有75％的吸附磷迅速?gòu)某练e物上解吸并釋放至上覆水中；O～2h為硅的快速釋放階段。此階段內(nèi)約有40％的吸附硅從沉積物上解吸并釋放至卜覆水中；總體上，沉積物中Ex—P、AI—P、Fe—P及IEF—Si、CF—Si具有較強(qiáng)的釋放潛力。關(guān)鍵詞：釋放特征；形態(tài)分布；磷；硅；沉積物中圖分類號(hào)：X524文獻(xiàn)標(biāo)志碼：A文章編號(hào)：1672—2043
3、(2011)11-2330—06ReleaseCharacteristicsandFormChangesofPhosphorusandSilicateinLakesSedimentsL0Chang—weil‘GAOJi-mei3，WANGWeil。'HEJian91‘SUNYuan-yuanl，MATa01，ZHANGXi-yan‘，CUIMen91，WANLi-lil(1．CollegeofEnvironmentandResources，InnerMongoliaUniversity，Huhhot01
4、0021，China；2．InstituteofEnvironmentalGeology，InnerMongoliaUniversity，Huhhot010021，China；3．InnerMongoliaEnvironmentMonitoringCenterStation，Huhhot010011，China)Abstract：TakingsurfacesedimentsfromtheWuliangsuhaiandDaihaiLakeasadsorbent，thereleaseexperimentso
5、fphosphorusandsilicatefromsedimentswerecarriedoutandtheformdistributioncharactersofphosphorusandsilicatewerestudiedafterreleaseusingsequentialextractionmethodsinthiswork．Theresultsshowedthatthereleasecharacteristicsofphosphorusandsilicatecanbeexpressedby
6、theElovichequation．Inthefirst20min．thereabout75％ofadsorbedphosphoruswerereleasedintotheoverlyingwaterwithreleaserateof183．495～188．791mg·kg一1·h～or4．287～4．424mg·L一“h-l；inthefirst2h．thereabout40％ofadsorbedsilicatewerereleasedintotheoverlyingwaterandtherelea
7、secapacityofthesedimentsformLakeWuliangsuhaiandLakeDaihaiwere47．87mg‘L-I．h一1and11．88mg·L-‘·h～respectively．Fromtheviewofreleasecapacityofdifferentforms，theformofEx—Phadthemaximumreleasecapacityanditspotentialreleaseriskshouldbepayingmoreattention．Although
8、thereleaseratesofAI-PandFe—Pwerenothigh，thepercentageofaveragereleasecapacitycouldbeupto60％～90％．Generally，theformsofEx—P，Al—P，F(xiàn)e—P，IEF-SiandCF—Siinthetwolakessedimentshadimportantpotentialbioavailability．Keywords：releasebe
