{"title":"沉积物和水中汞甲基化的物种形成rôle","authors":"P.J. Craig, P.A. Moreton","doi":"10.1016/0143-148X(85)90011-4","DOIUrl":null,"url":null,"abstract":"<div><p>The rate and extent of the methylation of inorganic mercury has been shown to depend markedly on the chemical speciation of the mercury and the methylating agent. The presence of mercury (II)—chlorine covalent bonding has an inhibitory effect on methylation by methyl cobalamin (CH<sub>3</sub>CoB<sub>12</sub>) and in natural sediments. The rôle of radical and carbonium ion methylation mechanisms has also been investigated. In a typical estuarine sediment the extent of mercury methylation is as follows: Hg(OAc)<sub>2</sub> ⪢ Hg(cyst)<sub>2</sub> > Hg(cyst) (Hcyst)Cl > Hg(meth)<sub>2</sub><sup>2+</sup> > Hg(eth)<sub>2</sub><sup>2+</sup> > Hg(Hcyst)Cl<sub>2</sub> > HgCl<sub>2</sub> > (HgCl<sub>2</sub>)<sub>2</sub> pen, where OAc = acetateHcyst = cysteine, meth = methionine, eth = ethionine and pen = penicillamine. This is consistent with mercury methylation arising by attack of a methyl carbanion (CH<sub>3</sub><sup>−</sup>) on inorganic mercury (II) ions derived by microbial breakdown of the original and mercury compounds added.</p></div>","PeriodicalId":100484,"journal":{"name":"Environmental Pollution Series B, Chemical and Physical","volume":"10 2","pages":"Pages 141-158"},"PeriodicalIF":0.0000,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0143-148X(85)90011-4","citationCount":"35","resultStr":"{\"title\":\"The rôle of speciation in mercury methylation in sediments and water\",\"authors\":\"P.J. Craig, P.A. Moreton\",\"doi\":\"10.1016/0143-148X(85)90011-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The rate and extent of the methylation of inorganic mercury has been shown to depend markedly on the chemical speciation of the mercury and the methylating agent. The presence of mercury (II)—chlorine covalent bonding has an inhibitory effect on methylation by methyl cobalamin (CH<sub>3</sub>CoB<sub>12</sub>) and in natural sediments. The rôle of radical and carbonium ion methylation mechanisms has also been investigated. In a typical estuarine sediment the extent of mercury methylation is as follows: Hg(OAc)<sub>2</sub> ⪢ Hg(cyst)<sub>2</sub> > Hg(cyst) (Hcyst)Cl > Hg(meth)<sub>2</sub><sup>2+</sup> > Hg(eth)<sub>2</sub><sup>2+</sup> > Hg(Hcyst)Cl<sub>2</sub> > HgCl<sub>2</sub> > (HgCl<sub>2</sub>)<sub>2</sub> pen, where OAc = acetateHcyst = cysteine, meth = methionine, eth = ethionine and pen = penicillamine. This is consistent with mercury methylation arising by attack of a methyl carbanion (CH<sub>3</sub><sup>−</sup>) on inorganic mercury (II) ions derived by microbial breakdown of the original and mercury compounds added.</p></div>\",\"PeriodicalId\":100484,\"journal\":{\"name\":\"Environmental Pollution Series B, Chemical and Physical\",\"volume\":\"10 2\",\"pages\":\"Pages 141-158\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1985-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0143-148X(85)90011-4\",\"citationCount\":\"35\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Pollution Series B, Chemical and Physical\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0143148X85900114\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Pollution Series B, Chemical and Physical","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0143148X85900114","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The rôle of speciation in mercury methylation in sediments and water
The rate and extent of the methylation of inorganic mercury has been shown to depend markedly on the chemical speciation of the mercury and the methylating agent. The presence of mercury (II)—chlorine covalent bonding has an inhibitory effect on methylation by methyl cobalamin (CH3CoB12) and in natural sediments. The rôle of radical and carbonium ion methylation mechanisms has also been investigated. In a typical estuarine sediment the extent of mercury methylation is as follows: Hg(OAc)2 ⪢ Hg(cyst)2 > Hg(cyst) (Hcyst)Cl > Hg(meth)22+ > Hg(eth)22+ > Hg(Hcyst)Cl2 > HgCl2 > (HgCl2)2 pen, where OAc = acetateHcyst = cysteine, meth = methionine, eth = ethionine and pen = penicillamine. This is consistent with mercury methylation arising by attack of a methyl carbanion (CH3−) on inorganic mercury (II) ions derived by microbial breakdown of the original and mercury compounds added.
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