Distinct Carbon Isotope Fractionation during Anaerobic Degradation of Dichlorobenzene Isomers
Chlorinated benzenes are ubiquitous organic contaminants found in groundwater and soils. Compound specific isotope analysis (CSIA) has been increasingly used to assess natural attenuation of chlorinated contaminants, in which anaerobic reductive dechlorination plays an essential role. In this work,...
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| Veröffentlicht in: | Environmental science & technology 2014-05, Vol.48 (9), p.4844-4851 |
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| creator | Liang, Xiaoming Mundle, Scott O. C Nelson, Jennifer L Passeport, Elodie Chan, Calvin C. H Lacrampe-Couloume, Georges Zinder, Stephen H Sherwood Lollar, Barbara |
| description | Chlorinated benzenes are ubiquitous organic contaminants found in groundwater and soils. Compound specific isotope analysis (CSIA) has been increasingly used to assess natural attenuation of chlorinated contaminants, in which anaerobic reductive dechlorination plays an essential role. In this work, carbon isotope fractionation of the three dichlorobenzene (DCB) isomers was investigated during anaerobic reductive dehalogenation in methanogenic laboratory microcosms. Large isotope fractionation of 1,3-DCB and 1,4-DCB was observed while only a small isotope effect occurred for 1,2-DCB. Bulk enrichment factors (εbulk) were determined from a Rayleigh model: −0.8 ± 0.1 ‰ for 1,2-DCB, −5.4 ± 0.4 ‰ for 1,3-DCB, and −6.3 ± 0.2 ‰ for 1,4-DCB. εbulk values were converted to apparent kinetic isotope effects for carbon (AKIE) in order to characterize the carbon isotope effect at the reactive positions for the DCB isomers. AKIE values are 1.005 ± 0.001, 1.034 ± 0.003, and 1.039 ± 0.001 for 1,2-DCB, 1,3-DCB, and 1,4-DCB, respectively. The large difference in AKIE values between 1,2-DCB and 1,3-DCB (or 1,4-DCB) suggests distinct reaction pathways may be involved for different DCB isomers during microbial reductive dechlorination by the methanogenic cultures. |
| doi_str_mv | 10.1021/es4054384 |
| format | Article |
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C ; Nelson, Jennifer L ; Passeport, Elodie ; Chan, Calvin C. H ; Lacrampe-Couloume, Georges ; Zinder, Stephen H ; Sherwood Lollar, Barbara</creator><creatorcontrib>Liang, Xiaoming ; Mundle, Scott O. C ; Nelson, Jennifer L ; Passeport, Elodie ; Chan, Calvin C. H ; Lacrampe-Couloume, Georges ; Zinder, Stephen H ; Sherwood Lollar, Barbara</creatorcontrib><description>Chlorinated benzenes are ubiquitous organic contaminants found in groundwater and soils. Compound specific isotope analysis (CSIA) has been increasingly used to assess natural attenuation of chlorinated contaminants, in which anaerobic reductive dechlorination plays an essential role. In this work, carbon isotope fractionation of the three dichlorobenzene (DCB) isomers was investigated during anaerobic reductive dehalogenation in methanogenic laboratory microcosms. Large isotope fractionation of 1,3-DCB and 1,4-DCB was observed while only a small isotope effect occurred for 1,2-DCB. Bulk enrichment factors (εbulk) were determined from a Rayleigh model: −0.8 ± 0.1 ‰ for 1,2-DCB, −5.4 ± 0.4 ‰ for 1,3-DCB, and −6.3 ± 0.2 ‰ for 1,4-DCB. εbulk values were converted to apparent kinetic isotope effects for carbon (AKIE) in order to characterize the carbon isotope effect at the reactive positions for the DCB isomers. AKIE values are 1.005 ± 0.001, 1.034 ± 0.003, and 1.039 ± 0.001 for 1,2-DCB, 1,3-DCB, and 1,4-DCB, respectively. The large difference in AKIE values between 1,2-DCB and 1,3-DCB (or 1,4-DCB) suggests distinct reaction pathways may be involved for different DCB isomers during microbial reductive dechlorination by the methanogenic cultures.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/es4054384</identifier><identifier>PMID: 24758692</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Anaerobiosis ; Analytical chemistry ; Applied sciences ; Biodegradation ; Biodegradation, Environmental ; Carbon ; Carbon Isotopes - chemistry ; Carbon Isotopes - metabolism ; Chemical Fractionation ; Chemical reactions ; Chlorobenzenes - chemistry ; Chlorobenzenes - metabolism ; Earth sciences ; Earth, ocean, space ; Engineering and environment geology. 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In this work, carbon isotope fractionation of the three dichlorobenzene (DCB) isomers was investigated during anaerobic reductive dehalogenation in methanogenic laboratory microcosms. Large isotope fractionation of 1,3-DCB and 1,4-DCB was observed while only a small isotope effect occurred for 1,2-DCB. Bulk enrichment factors (εbulk) were determined from a Rayleigh model: −0.8 ± 0.1 ‰ for 1,2-DCB, −5.4 ± 0.4 ‰ for 1,3-DCB, and −6.3 ± 0.2 ‰ for 1,4-DCB. εbulk values were converted to apparent kinetic isotope effects for carbon (AKIE) in order to characterize the carbon isotope effect at the reactive positions for the DCB isomers. AKIE values are 1.005 ± 0.001, 1.034 ± 0.003, and 1.039 ± 0.001 for 1,2-DCB, 1,3-DCB, and 1,4-DCB, respectively. The large difference in AKIE values between 1,2-DCB and 1,3-DCB (or 1,4-DCB) suggests distinct reaction pathways may be involved for different DCB isomers during microbial reductive dechlorination by the methanogenic cultures.</description><subject>Anaerobiosis</subject><subject>Analytical chemistry</subject><subject>Applied sciences</subject><subject>Biodegradation</subject><subject>Biodegradation, Environmental</subject><subject>Carbon</subject><subject>Carbon Isotopes - chemistry</subject><subject>Carbon Isotopes - metabolism</subject><subject>Chemical Fractionation</subject><subject>Chemical reactions</subject><subject>Chlorobenzenes - chemistry</subject><subject>Chlorobenzenes - metabolism</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Exact sciences and technology</subject><subject>Fractionation</subject><subject>Global environmental pollution</subject><subject>Isomerism</subject><subject>Isotopes</subject><subject>Kinetics</subject><subject>Organic contaminants</subject><subject>Pollution</subject><subject>Pollution, environment geology</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqF0U1P3DAQBmCrApWF9tA_UEVClegh1J-Jc0S7XYq0EhcOXKpo7EzAKGtv7eRAf3292gUqOHCxD_NoPOOXkC-MnjPK2Q9MkioptPxAZkxxWiqt2AGZUcpE2Yjq9ogcp_RAKeWC6o_kiMta6arhM_J74dLovB2LOUQTfHGVwhg2WCwj2NEFD9uj6Kbo_F1x4QFjMM4WC7yL0O2KoS8Wzt4PIZfQ_0WP2y5rjOkTOexhSPh5f5-Qm-XPm_mvcnV9eTW_WJUgaTWWNUquDKiuztNXStRgDFgOjdHUAhdoBDai5rIzUnPGWddo1XQSeoNcUXFCznZtNzH8mTCN7doli8MAHsOUWlZVmlf5M9j7VHHWMKpYlenpK_oQpujzHlslGyY0F1l93ykbQ0oR-3YT3RriY8tou02nfU4n26_7jpNZY_csn-LI4NseQLIw9BG8denF5VhrJeWLA5v-m-rNg_8AH5Ghjg</recordid><startdate>20140506</startdate><enddate>20140506</enddate><creator>Liang, Xiaoming</creator><creator>Mundle, Scott O. 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Geothermics</topic><topic>Exact sciences and technology</topic><topic>Fractionation</topic><topic>Global environmental pollution</topic><topic>Isomerism</topic><topic>Isotopes</topic><topic>Kinetics</topic><topic>Organic contaminants</topic><topic>Pollution</topic><topic>Pollution, environment geology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liang, Xiaoming</creatorcontrib><creatorcontrib>Mundle, Scott O. C</creatorcontrib><creatorcontrib>Nelson, Jennifer L</creatorcontrib><creatorcontrib>Passeport, Elodie</creatorcontrib><creatorcontrib>Chan, Calvin C. 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In this work, carbon isotope fractionation of the three dichlorobenzene (DCB) isomers was investigated during anaerobic reductive dehalogenation in methanogenic laboratory microcosms. Large isotope fractionation of 1,3-DCB and 1,4-DCB was observed while only a small isotope effect occurred for 1,2-DCB. Bulk enrichment factors (εbulk) were determined from a Rayleigh model: −0.8 ± 0.1 ‰ for 1,2-DCB, −5.4 ± 0.4 ‰ for 1,3-DCB, and −6.3 ± 0.2 ‰ for 1,4-DCB. εbulk values were converted to apparent kinetic isotope effects for carbon (AKIE) in order to characterize the carbon isotope effect at the reactive positions for the DCB isomers. AKIE values are 1.005 ± 0.001, 1.034 ± 0.003, and 1.039 ± 0.001 for 1,2-DCB, 1,3-DCB, and 1,4-DCB, respectively. The large difference in AKIE values between 1,2-DCB and 1,3-DCB (or 1,4-DCB) suggests distinct reaction pathways may be involved for different DCB isomers during microbial reductive dechlorination by the methanogenic cultures.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>24758692</pmid><doi>10.1021/es4054384</doi><tpages>8</tpages></addata></record> |
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| subjects | Anaerobiosis Analytical chemistry Applied sciences Biodegradation Biodegradation, Environmental Carbon Carbon Isotopes - chemistry Carbon Isotopes - metabolism Chemical Fractionation Chemical reactions Chlorobenzenes - chemistry Chlorobenzenes - metabolism Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Fractionation Global environmental pollution Isomerism Isotopes Kinetics Organic contaminants Pollution Pollution, environment geology |
| title | Distinct Carbon Isotope Fractionation during Anaerobic Degradation of Dichlorobenzene Isomers |
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