Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury
This study investigated the photodegradation kinetics of MeHg in the presence of various size fractions of dissolved organic matter (DOM) with MW
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| Veröffentlicht in: | Chemosphere (Oxford) 2017-05, Vol.174, p.739-746 |
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| container_title | Chemosphere (Oxford) |
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| creator | Kim, Moon-Kyung Won, A-Young Zoh, Kyung-Duk |
| description | This study investigated the photodegradation kinetics of MeHg in the presence of various size fractions of dissolved organic matter (DOM) with MW |
| doi_str_mv | 10.1016/j.chemosphere.2017.02.033 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_1872582647</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0045653517302114</els_id><sourcerecordid>1872582647</sourcerecordid><originalsourceid>FETCH-LOGICAL-c377t-f15fe135ee797042720f66431ecab3b23db08aa478156e22861f453dfa2039c23</originalsourceid><addsrcrecordid>eNqNkMtOwzAQRS0EoqXwCyjs2CT4EcfJEpXykEDdAFvLccYkVVIXO0EqX4-jtoglqxlp7p25cxC6IjghmGQ3q0TX0Fm_qcFBQjERCaYJZuwITUkuipjQIj9GU4xTHmec8Qk6836FcTDz4hRNaE5JmlIyRe8LY0D3PrIm6mwLemiVi3zzDZFxSveNXY-ju-VLFLpNbXtbwYdTlTqM1OcAdvBRB329bTtwenDbc3RiVOvhYl9n6O1-8Tp_jJ-XD0_z2-dYMyH62BBugDAOIAqBUyooNlmWMgJalaykrCpxrlQqcsIzoDTPiEk5q4yimBWashm63u3dOBty-F52jdfQtmo9hpKBBuU5zVIRpMVOqp313oGRG9d0ym0lwXLEKlfyD1Y5YpWYyoA1eC_3Z4ayg-rXeeAYBPOdAMKzXw046XUDaw1V4wJeWdnmH2d-AFQ3j2U</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1872582647</pqid></control><display><type>article</type><title>Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury</title><source>MEDLINE</source><source>Elsevier ScienceDirect Journals Complete</source><creator>Kim, Moon-Kyung ; Won, A-Young ; Zoh, Kyung-Duk</creator><creatorcontrib>Kim, Moon-Kyung ; Won, A-Young ; Zoh, Kyung-Duk</creatorcontrib><description><![CDATA[This study investigated the photodegradation kinetics of MeHg in the presence of various size fractions of dissolved organic matter (DOM) with MW < 3.5 kDa, 3.5 < MW < 10 kDa, and MW > 10 kDa. The DOM fraction with MW < 3.5 kDa was most effective in MeHg photodegradation. Increasing UV intensity resulted in the increase of photodegradation rate of the MeHg in all size of DOM fractions. Higher rates of MeHg degradation was observed at higher pH. For the portion of MW < 3.5 kDa, the photodegradation rate of MeHg increased with increasing DOM concentration, indicating that radicals such as singlet oxygen (1O2) radicals can be effectively produced by DOM. At higher portion of MW > 3.5 kDa, the inhibition of MeHg degradation was observed due to the effect of DOM photo-attenuation. Our result indicates that radical mediated reaction is the main mechanism of photodegradation of MeHg especially in the presence of MW < 3.5 kDa. Our results imply that the smaller molecular weight fraction (MW < 3.5 kDa) of DOM mainly increased the photodegradation rate of MeHg.
[Display omitted]
•We examined the effect of DOM in humic substances on the photodegradation of MeHg.•DOM fraction of MW < 3.5 kDa showed the highest photodegradation rate of MeHg.•MeHg photodegradation increased at alkaline pH due to OH radical production.•Photo-degradation of MeHg increased with increasing DOM concentration.•Radicals produced by DOM under MW < 3.5 kDa increased photodegradation of MeHg.]]></description><identifier>ISSN: 0045-6535</identifier><identifier>EISSN: 1879-1298</identifier><identifier>DOI: 10.1016/j.chemosphere.2017.02.033</identifier><identifier>PMID: 28214421</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject>Dialysis ; DOM ; Kinetics ; Methylmercury ; Methylmercury Compounds - chemistry ; Molecular Weight ; Photo-attenuation ; Photolysis ; Radical scavenger ; Size fraction ; Solubility ; Water - chemistry ; Water Pollutants, Chemical - chemistry</subject><ispartof>Chemosphere (Oxford), 2017-05, Vol.174, p.739-746</ispartof><rights>2017 Elsevier Ltd</rights><rights>Copyright © 2017 Elsevier Ltd. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c377t-f15fe135ee797042720f66431ecab3b23db08aa478156e22861f453dfa2039c23</citedby><cites>FETCH-LOGICAL-c377t-f15fe135ee797042720f66431ecab3b23db08aa478156e22861f453dfa2039c23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.chemosphere.2017.02.033$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/28214421$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kim, Moon-Kyung</creatorcontrib><creatorcontrib>Won, A-Young</creatorcontrib><creatorcontrib>Zoh, Kyung-Duk</creatorcontrib><title>Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury</title><title>Chemosphere (Oxford)</title><addtitle>Chemosphere</addtitle><description><![CDATA[This study investigated the photodegradation kinetics of MeHg in the presence of various size fractions of dissolved organic matter (DOM) with MW < 3.5 kDa, 3.5 < MW < 10 kDa, and MW > 10 kDa. The DOM fraction with MW < 3.5 kDa was most effective in MeHg photodegradation. Increasing UV intensity resulted in the increase of photodegradation rate of the MeHg in all size of DOM fractions. Higher rates of MeHg degradation was observed at higher pH. For the portion of MW < 3.5 kDa, the photodegradation rate of MeHg increased with increasing DOM concentration, indicating that radicals such as singlet oxygen (1O2) radicals can be effectively produced by DOM. At higher portion of MW > 3.5 kDa, the inhibition of MeHg degradation was observed due to the effect of DOM photo-attenuation. Our result indicates that radical mediated reaction is the main mechanism of photodegradation of MeHg especially in the presence of MW < 3.5 kDa. Our results imply that the smaller molecular weight fraction (MW < 3.5 kDa) of DOM mainly increased the photodegradation rate of MeHg.
[Display omitted]
•We examined the effect of DOM in humic substances on the photodegradation of MeHg.•DOM fraction of MW < 3.5 kDa showed the highest photodegradation rate of MeHg.•MeHg photodegradation increased at alkaline pH due to OH radical production.•Photo-degradation of MeHg increased with increasing DOM concentration.•Radicals produced by DOM under MW < 3.5 kDa increased photodegradation of MeHg.]]></description><subject>Dialysis</subject><subject>DOM</subject><subject>Kinetics</subject><subject>Methylmercury</subject><subject>Methylmercury Compounds - chemistry</subject><subject>Molecular Weight</subject><subject>Photo-attenuation</subject><subject>Photolysis</subject><subject>Radical scavenger</subject><subject>Size fraction</subject><subject>Solubility</subject><subject>Water - chemistry</subject><subject>Water Pollutants, Chemical - chemistry</subject><issn>0045-6535</issn><issn>1879-1298</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkMtOwzAQRS0EoqXwCyjs2CT4EcfJEpXykEDdAFvLccYkVVIXO0EqX4-jtoglqxlp7p25cxC6IjghmGQ3q0TX0Fm_qcFBQjERCaYJZuwITUkuipjQIj9GU4xTHmec8Qk6836FcTDz4hRNaE5JmlIyRe8LY0D3PrIm6mwLemiVi3zzDZFxSveNXY-ju-VLFLpNbXtbwYdTlTqM1OcAdvBRB329bTtwenDbc3RiVOvhYl9n6O1-8Tp_jJ-XD0_z2-dYMyH62BBugDAOIAqBUyooNlmWMgJalaykrCpxrlQqcsIzoDTPiEk5q4yimBWashm63u3dOBty-F52jdfQtmo9hpKBBuU5zVIRpMVOqp313oGRG9d0ym0lwXLEKlfyD1Y5YpWYyoA1eC_3Z4ayg-rXeeAYBPOdAMKzXw046XUDaw1V4wJeWdnmH2d-AFQ3j2U</recordid><startdate>20170501</startdate><enddate>20170501</enddate><creator>Kim, Moon-Kyung</creator><creator>Won, A-Young</creator><creator>Zoh, Kyung-Duk</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20170501</creationdate><title>Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury</title><author>Kim, Moon-Kyung ; Won, A-Young ; Zoh, Kyung-Duk</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c377t-f15fe135ee797042720f66431ecab3b23db08aa478156e22861f453dfa2039c23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Dialysis</topic><topic>DOM</topic><topic>Kinetics</topic><topic>Methylmercury</topic><topic>Methylmercury Compounds - chemistry</topic><topic>Molecular Weight</topic><topic>Photo-attenuation</topic><topic>Photolysis</topic><topic>Radical scavenger</topic><topic>Size fraction</topic><topic>Solubility</topic><topic>Water - chemistry</topic><topic>Water Pollutants, Chemical - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kim, Moon-Kyung</creatorcontrib><creatorcontrib>Won, A-Young</creatorcontrib><creatorcontrib>Zoh, Kyung-Duk</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Chemosphere (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kim, Moon-Kyung</au><au>Won, A-Young</au><au>Zoh, Kyung-Duk</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury</atitle><jtitle>Chemosphere (Oxford)</jtitle><addtitle>Chemosphere</addtitle><date>2017-05-01</date><risdate>2017</risdate><volume>174</volume><spage>739</spage><epage>746</epage><pages>739-746</pages><issn>0045-6535</issn><eissn>1879-1298</eissn><abstract><![CDATA[This study investigated the photodegradation kinetics of MeHg in the presence of various size fractions of dissolved organic matter (DOM) with MW < 3.5 kDa, 3.5 < MW < 10 kDa, and MW > 10 kDa. The DOM fraction with MW < 3.5 kDa was most effective in MeHg photodegradation. Increasing UV intensity resulted in the increase of photodegradation rate of the MeHg in all size of DOM fractions. Higher rates of MeHg degradation was observed at higher pH. For the portion of MW < 3.5 kDa, the photodegradation rate of MeHg increased with increasing DOM concentration, indicating that radicals such as singlet oxygen (1O2) radicals can be effectively produced by DOM. At higher portion of MW > 3.5 kDa, the inhibition of MeHg degradation was observed due to the effect of DOM photo-attenuation. Our result indicates that radical mediated reaction is the main mechanism of photodegradation of MeHg especially in the presence of MW < 3.5 kDa. Our results imply that the smaller molecular weight fraction (MW < 3.5 kDa) of DOM mainly increased the photodegradation rate of MeHg.
[Display omitted]
•We examined the effect of DOM in humic substances on the photodegradation of MeHg.•DOM fraction of MW < 3.5 kDa showed the highest photodegradation rate of MeHg.•MeHg photodegradation increased at alkaline pH due to OH radical production.•Photo-degradation of MeHg increased with increasing DOM concentration.•Radicals produced by DOM under MW < 3.5 kDa increased photodegradation of MeHg.]]></abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>28214421</pmid><doi>10.1016/j.chemosphere.2017.02.033</doi><tpages>8</tpages></addata></record> |
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| language | eng |
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| source | MEDLINE; Elsevier ScienceDirect Journals Complete |
| subjects | Dialysis DOM Kinetics Methylmercury Methylmercury Compounds - chemistry Molecular Weight Photo-attenuation Photolysis Radical scavenger Size fraction Solubility Water - chemistry Water Pollutants, Chemical - chemistry |
| title | Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury |
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