南海湖沉积物中Hg的形态分布特征.docx

南海湖沉积物中Hg的形态分布特征南海湖沉积物中Hg的形态分布特征摘要：以包头市南海湖为研究对象,采用连续化学提取法.系统开展了沉积物中Hg的形态分布研究.结果表明,表层沉积物中Hg含量的水平分布总体呈现湖心区低,西南和东北部湖区高的趋势.腐殖酸结合态为表层沉积物中Hg的主导形态,次为交换态和水溶态.表层沉积物中生物有效态Hg的含量甚高,占总汞的76%～94%,对整个生态系统具有潜在危害性.沉积柱芯中总Hg表现为表层富集并随深度增加而降低的.变化趋势.B、F站位柱状沉积物中腐殖酸结合态Hg随深度有规律的递减,H站位20cm以上Hg的主导形态为腐殖酸结合态,残渣态次之;20～30cm的主导形态则为残渣态及可交换态.Abstract：ThesequentialextractionprocedurewaschosenforthestudyofspeciationofMercuryinsedimentsoftheNanhaiLake.Thefractionsofwater-solubleandexchangeableHgareeasytoreleasetotheoverlyingwater,andthesumofthemaccountfor30.82%ofthetotalHg.Furthermore,thereexistspositivecorrelationbetweenthesetwofractionsandthetotalHginoverlyingwater,indicatinghighpotentialhazardtotheNanhaiLake.ThecontentofhumicacidHgisthehighestbothinhorizontalandverticaldistributionandthecorrelationcoefficientbetweenhumicacidHgandorganicmatterisupto0.72,indicatingthecontentsofHgandorganicmatterarehighlycorrelated.Therefore,itisimportantthattheorganicmatterisfavortoimmobilizeHgandreducethepotentialHgcontaminationoftheNanhaiLake.作者：萨茹莉  何江  吕昌伟  樊庆云  宝金花  SARu-li  HEJiang  L(U)Chang-wei  FANQing-yun  BAOJin-hua 作者单位：内蒙古大学生态与环境科学系,呼和浩特,010021 期刊：沉积学报 ISTICPKU Journal：ACTASEDIMENTOLOGICASINICA 年，卷(期)：2009, 27(6) 分类号：X141 关键词：沉积物  Hg  形态分布  南海湖  Keywords：sediments  mercury  speciationdistribution  theNanhaiLake