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1、复合污染土壤中Hg的形态及无机离子对其释放能力的影响研究安徽农业科学,JournalofAnhuiAgri.Sci.2007,35(35):11517—11518,11521责任编辑姜丽责任校对王森复合污染土壤中Hg的形态及无机离子对其释放能力的影响研究李杰颖,梁成华2刘方,杜立宇,姚敏,张宇(1l虫州大学生命科学学院,贵州贵阳550025;2.沈阳农业大学土地与环境学院,辽宁沈阳110161)摘要的1为污染土壤的控制和修复治理提供科学依据.『方法1以沈阳某冶炼厂废旧厂区土壤为研究对象,采用连续浸提一形态分析法对汞形态进行分析,并以几种无机盐离子作浸提剂,研
2、究不同离子浓度对污染土壤中汞的释放情况.[结果】土壤样品中汞主要以残渣态或晶格态存在,占87.40%,其次是难氧化降解有机质及某些硫化物结合态.随着S042一和cl一浓度的增加,汞的释放量逐渐增大.cO浓度大于50mm01/L对Hg的释放能力随浓度的增加而增强.OH对汞的释放能力最弱.土壤中汞的释放量随着Na+,ca"浓度的增加而增大,但释放率都不足总量的3%.随着HC1浓度的增大,汞的释放率增大,达56.56%.f结论1该土壤样品中汞主要以残渣态或晶格态存在.不同阴离子在不同的浓度范围内对Hg的释放能力不同.强酸条件能大大增强汞的溶出毒性.关键词复合污染土
3、壤;汞;形态;释放中图分类号s151.9文献标识码A文章编号0517—6611(2007)35—11517—02InvestigationonVariousMercurySpeciesandTheirReleasebyInorganicIoninCompoundSoilPollutionLIJie-yingetal(CollegeofLifeScience,GuizhouUniversity,Guiyang,Guizhou55o025)Abstract『0bjective1theaimofthisstudytoprovidescientificbasefor
4、controlandremediationandtreatmentofsotlpollution.『Method1WiththesotlsampledfromtheadeposedsmeltfactorysregioninShenyangastestedsotlthesotlmercuryspecieswereanalyzedbysequentialextractionspeciesmethod.Withseveralfamiliarinorganicsaltionsasextractingagentthemercuryreleasefromtheconta
5、minatedsotlbytheionswithdifferentconcentrationwasstudied.『Result1Mereuryinthesoilsamplesexistedinformofresidueorcrystallattieemainly,accountingf0T87-40%.followedbyhardlydegradedoxidationanddegradationorganicmatterandsomebound—statesulfide.Themercuryreleasingamountenhancedwiththeinc
6、rementofSOandC1一.CO32atover50nlmol/LincreasedthereleasingabilityonHgwithitsconcentration.OH—wasmostweakinthereleasingabilityonHg.ThemercuryreleasingamountinthesotlenhancedwiththeincrementofNaandCa",butitsreleasingratewasbelow3%oftotalamount.Themercuryreleasingrateincreasedwiththein
7、crementofHC1,upto56.56%.[Conclusion1Mercuryinthesotlsmqdesexistedmainlyinformofresidueorcrystallattice.Differentionsatdifferentconcentrationrangehaddifferentreleasingability.Thestrongacidconditioncouldenhancethedissolvedtoxicjtyofmercury.KeywordsCompoundsoilpollution;Mercury;Specie
8、s;Release重金属在土壤中的释放在很大程度上受
