凤凰铅锌矿区土壤铅的化学形态及污染特征.pdf

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1、农业环境科学学报2012，3I(7)：1337—1342JournalofAgro—EnvironmentScience凤凰铅锌矿区土壤铅的化学形态及污染特征李永华(中国科学院地理科学与资源研究所，北京100101)摘要：以湘西凤凰铅锌矿区土壤为对象，基于BCR三步法和ICP—MS技术，研究了该矿区土壤中Pb的化学形态及污染特征。结果表明，矿区土壤中Pb以残渣态为主，其次为有机一硫化物结合态，酸交换态和Fe—Mn氧化物结合态所占比例较少，各形态Pb的分配系数依次为：残渣态(44．0％)>有机一硫化物结合态(29．3％)一Fe—Mn氧化物结合态(24．3)>酸交换态(2．4％)；矿区土壤

2、中各形态Pb含量存在明显的空间分异，并因土地利用类型不同而差异明显；土壤理化性质影响土壤Pb的形态分配，各形态Pb含量与砂粒含量正相关，并随土壤pH升高而增加，这与人为排放输人的含Pb物质以类似于土壤砂粒形式存在有关。人类活动引起的外源输入性Pb污染对矿区土壤中Pb的污染特征产生了重要影响。关键词：重金属；铅；形态；BCR法；采矿活动中图分类号：X833文献标志码：A文章编号：1672—2043(2012)07—1337—06ChemicalSpeciationandPollutionCharacteristicsofSoilPbinFenghuangPb-ZnMiningAreaLI

3、Yong—hua(InstituteofGeographicalSciencesandNaturalResourcesResearch，ChineseAcademyofSciences，Beijing100101，China)Abstract：SoilpollutionbytotalPbwascharacterizedintheminetailingsandsurroundingsoilsofanoldFenghuangPb—Znmine．Itisimpor-tanttocharacterizethepartitioningofPbbehaviorthanstudiesoftotalc

4、oncentrations，whichprovidelimitedinformationonthemobilityandbioavailabilityoftheelement．Inthepresentstudy，soilsamples(naturalandarablelands)fromtheminingareawereanalyzed，determiningthechemicalfractionationofPbbytheBCRprotocolandtheICP-MStechnique．ItwasfoundthatmostofthePbinsoilswasassociatedwith

5、residualfaction，followedbyorganic—sulfidefactionandFe—Mnoxidesfaction，andacid—exchangeablefactionisratherlow．Theaverageper—centageofeachPbfractionextractedfromthesoilswithrespecttothecorrespondingtotalPbcontent，inparentheses，followedtheRend：residualfaction(44．0％)>organic-sulfidefaction(29．3％)一Fe

6、—Mnoxidesfaction(24．3％)>aCid-exchangeablefaction(2．4％)．Soilphysi-co-chemicalparameterswerekeyfactorsaffectingthepresenceofPbfractions．Generally，PbfractionconcentrationswerepositivelyC01Te—latedwiththesandcontentsandsoilpHvalues，whichwaspresumablyduetothebasicanthropogenicinputofPb-containingmate

7、rialsandtheirsimilaritytosandinphysicalcharacteristics．Meanwhile，aspatialvariationinPbfractionconcentrationinsoilsfromtheminingareahasbeenobserved；theconcentrationsvariedwithsoilsamplesfromdifferentlandusetype．Theresultsindi