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时间:2020-03-27
《海南乐东海域浅表沉积物中汞的形态分布特征研究.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、第44卷第6期当代化工Vo1.44.NO.62015年6月ContemporaryChemicalIndustryJune.2015海南乐东海域浅表沉积物中汞的形态分布特征研究方超,郎春燕,王小云,孙黎,吴晓蓉,周莉(成都理工大学材料与化学化工学院,四川i成都610059)摘要:采用改进的Tessier法及王水消解法,以冷原子荧光技术对海南乐东海域10个浅表沉积物中总汞及各形态汞进行了测定。系统考察了高锰酸钾对提取液中汞的氧化条件。样品中各形态汞的检出限范围为0.0003—0.0027g/g,总汞检限为0.00
2、21g/g,各形态汞之和与总汞的百分比范围为92.2%~115%。2个海洋沉积物标准物质(GBW07314,GBW07334)总汞及各形态之和的测量值均与参考值吻合。除离子交换态和碳酸盐结合态因含量太低而导致RSD大于1O%以外,其他3个态的RSD范围均在2.7%~6.7%之间。9个样品总汞含量均未超过我国海洋沉积物质量第1类标准。各形态汞占总汞的平均百分比顺序为:残渣态>铁锰氧化态>有机结合态>碳酸盐结合态>离子交换态,前三个态之和占到94.25%,后两个态仅占5.75%。总汞与铁锰氧化态和残渣态之间均具有显
3、著相关性,后两种形态控制了总汞在不同海水深度下的走势。关键词:海南;沉积物;汞形态中图分类号:0657文献标识码:A文章编号:1671-0460(2015)06—1268—04DistributionofMercurySpeciesinMarineSurfaceSedimentsinHainanLedongOffshoreFANGChao,LANGChun-yan,WANGXiao-yun,SUNLi,WUXiao—rong,ZHOULi(CollegeofMaterialsandChemistry&Chemi
4、calEngineering.ChengduUniversityofTechnology,SichuanChengdu610059,China)Abstract:TbtalmercuryandmercuryspeciesinsurfacesedimentsfromHainanLedongofshoreweredeterminedbvCV-AFSafteraquaregiadigestionandextractionwithimprovedTessiermethod.TheinfluenceofKMnOdonox
5、idationofmercuryinextractionprocesswassystematicallyinvestigated.Theresultsshowthatthedetectionlimitsofmercuryspeciesareintherangeof0.0003~0.0027ug/gandtotalmercuryofO.0021ug/g.Thepercentagesofthesum(ofHgspecies)oftotalHgareintherangeof92.2%~l15%.Themeasured
6、values(totalandsumofspecies)ofmercuryinmarinereferencematerialsareingoodagreementwiththerecommendedvalues.TheRSDsofexchangeableHgandHgboundtocarbonatesaremorethan10%duetotheirlowerconcentrations.theRSDsoftheotherthreeHgspeciesareintherangeof2.7%~6.7%.Thecont
7、entsoftota1Hginnineofthetensamplesdon’texceedthenationalqualityIstandardformarinesediment.TheaveragepercentagesofindividualHgspeciesoftotalHgfollows:residualHg>HgboundtoFe·Mnoxides>Hgboundtoorganicmatter>Hgboundtocarbonate>ionexchangeableHg,thesumofthefirstt
8、hreespeciesare94.25%andthelasttwospeciesare5.75%.TherearesignificantcorrelationsbetweentotalHgandHgboundtoFe—Mnoxide&residualHg.thelasttwospeciescontrolthetrendoftotalmercuryinseawateratdiferent
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