磷和硅在湖泊沉积物上的释放特征及形态变化研究.pdf

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1、农业环境科学学报2011,30(11)：2330-2335JournalofAgro—EnvironmentScience磷和硅在湖泊沉积物上的释放特征及形态变化研究吕昌伟-，一，高际玫s，王维1，一，何江1，2，孙园园1，麻涛-，张细燕1，崔萌1，万丽丽1(1．内蒙古大学环境与资源学院，呼和浩特010021；2．内蒙古大学环境地质研究所，呼和浩特010021；3．内蒙古环境监测中心站，呼和浩特010011)摘要：以乌梁素海(WLSH)和岱海(DH)表层沉积物为吸附剂，开展了磷硅在2个湖泊沉积物卜的释放

2、实验研究，同时采用连续提取法探讨了释放后的磷硅形态，变化。结果表明，磷和硅在2个湖泊沉积物上的释放行为均可用Elovieh方程描述；0—20min为磷的快速释放阶段，此时段内约有75％的吸附磷迅速从沉积物上解吸并释放至上覆水中；O～2h为硅的快速释放阶段。此阶段内约有40％的吸附硅从沉积物上解吸并释放至卜覆水中；总体上，沉积物中Ex—P、AI—P、Fe—P及IEF—Si、CF—Si具有较强的释放潜力。关键词：释放特征；形态分布；磷；硅；沉积物中图分类号：X524文献标志码：A文章编号：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，Fe—P，IEF-SiandCF—Siinthetwolakessedimentshadimportantpotentialbioavailability．Keywords：releasebe