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时间:2020-03-27
《北江沉积物汞污染现状与评价初步研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2010,29(2):357—362JournalofAgro-EnvironmentScience北江沉积物汞污染现状与评价初步研究丁小勇-,乞3,陈来国2,张卫东3,许振成2,彭晓春2,商立海4(1.西南大学化学化丁学院,重庆400715;2.环境保护部华南环境科学研究所城市环境研究中心,广州510655;3.重庆市环境科学研究院,重庆400020;4.中国科学院地球化学研究所,贵阳550002)摘要:为了了解北江沉积物中汞污染现状、来源并评价其污染程度,在北江流域共采集19个沉积物样,用原子吸收法(AAS)和冷原子荧光法(CVAFS)分别测定了其总汞(THg)和甲基汞(
2、MeHg)含量,比较了甲基化率,并用污染指数法对测定结果进行了评价。结果表明,北江沉积物THg含量为73.7-3517ng·g-l(干重)。均值为607.6ng·g-i,MeHg含量为0.392-2.384ng·g-I,均值为1.302ng·g-i,韶关冶炼厂为重要污染点源。各采样点甲基化率差异较大,进一步研究影响甲基化的因素具有重要意义。沉积物中THg、MeHg平均污染指数分别为3.04、26.04,表明均为中度污染。关键词:北江;沉积物;总汞;甲基汞;评价中图分类号:X833文献标志码:A文章编号:1672—2043(2010)02-0357--06PreliminaryStudyonP
3、ollutionStatusandAssessmentofMercuryinSedimentfromtheBeijiangRiverDINGXiao-yongL2-3,CHENLai-gu02,ZHANGWei-don93,XUZhen-ehen92,PENGXiao-chun2,SHANGU—hai4(1.CollegeofChemistryandChemicalEngineering,SouthwestUniversity,Chongqing400715,China;2.CenterforResearchonUrbanEnvi-ronment,SouthChinaInstituteofE
4、nvironmentalSciences,MinistryofEnvironmentalProtection,Guangzhou510655,China;3.ChongqingAcademyofEnvironmentalScience,Chongqing400020,China;4.InstituteofGeochemistry,ChineseAcademyofScience,Guiyang550002,China)Abstract:Mercuryinenvironmenthasbecomethemajorconceminrecentyearsduetoitshighlytoxictohum
5、anandbiota.Inthisstudy,nineteensedimentsampleswerecollectedalongtheBeijiangRivertoexamineconcentrationsandseUI.cesofmercury,aswellasmethylmer-cur,/.Also,thepollutionlevelsofmercuryanditscompoundwereassessedbasedoncomparisonwithotherstudies.Totalmercury(THg)andmethylmercury(MeHg)weredeterminedbyatom
6、icabsorptionspectroscopy(AAS)andcoldvaporatomicfluorescencespectrometers(CVAFS),respectively.Furthermore,methylationrateswerecalculatedforallsamplesandpollutiondegreesofmercuryinsedimentweree—valuatedusingpollutionindexmethods.TheresultsshowedthatTHgconcentrationsinsedimentsrangedfrom73.7to3517ng·g
7、‘1dryweight,withanaverageof607.6ng-g-1,andMeHgconcentrationsrangedfiomO.392tO2.384ng·g-1dryweight,withanaverageof1.302ng·g一,respectively.Clearly,wastewaterfromShaoguansmeltingfactoryWasanimportantpointseul'
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