{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T19:57:31Z","timestamp":1784750251054,"version":"3.55.0"},"reference-count":21,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2012,1,4]],"date-time":"2012-01-04T00:00:00Z","timestamp":1325635200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Groundwater"],"published-print":{"date-parts":[[2012,9]]},"abstract":"<jats:p>\n                    A dual isotope approach based on compound\u2010specific isotope analysis (CSIA) of carbon (C) and chlorine (Cl) was used to identify sources of persistent trichloroethylene (TCE) that caused the shut\u2010down in 1994 of a municipal well in an extensive fractured dolostone aquifer beneath Guelph, Ontario. Several nearby industrial properties have known subsurface TCE contamination; however, only one has created a comprehensive monitoring network in the bedrock. The impacted municipal well and many monitoring wells were sampled for volatile organic compounds (VOCs), inorganic parameters, and CSIA. A wide range in isotope values was observed at the study site. The TCE varies between \u221235.6\u2030 and \u221221.8\u2030 and from 1.6\u2030 to 3.2\u2030 for\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>13<\/jats:sup>\n                    C and\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>37<\/jats:sup>\n                    Cl, respectively. In case of\n                    <jats:italic>cis<\/jats:italic>\n                    \u20101,2\u2010dichloroethene, the isotope values range between \u221236.3\u2030 and \u221218.9\u2030 and from 2.4\u2030 to 4.7\u2030 for\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>13<\/jats:sup>\n                    C and\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>37<\/jats:sup>\n                    Cl, respectively. The dual isotope approach represented by a plot of\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>13<\/jats:sup>\n                    C vs.\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>37<\/jats:sup>\n                    Cl shows the municipal well samples grouped in a domain clearly separate from all other samples from the property with the comprehensive well network. The CSIA results collected under non\u2010pumping and short\u2010term pumping conditions thus indicate that this particular property, which has been studied intensively for several years, is not a substantial contributor of the TCE presently in the municipal well under non\u2010pumping conditions. This case study demonstrates that CSIA signatures would have been useful much earlier in the quest to examine sources of the TCE in the municipal well if bedrock monitoring wells had been located at several depths beneath each of the potential TCE\u2010contributing properties. Moreover, the CSIA results show that microbial reductive dechlorination of TCE occurs in some parts of the bedrock aquifer. At this site, the use of CSIA for C and Cl in combination with analyses of VOC and redox parameters proved to be important due to the complexity introduced by biodegradation in the complex fractured rock aquifer. It is highly recommended to revisit the study when the municipal well is back into full operation.\n                  <\/jats:p>","DOI":"10.1111\/j.1745-6584.2011.00897.x","type":"journal-article","created":{"date-parts":[[2012,1,5]],"date-time":"2012-01-05T04:04:02Z","timestamp":1325736242000},"page":"754-764","source":"Crossref","is-referenced-by-count":20,"title":["Fingerprinting TCE in a Bedrock Aquifer Using Compound\u2010Specific Isotope Analysis"],"prefix":"10.1111","volume":"50","author":[{"given":"Paulo","family":"Lojkasek\u2010Lima","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ramon","family":"Aravena","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beth L.","family":"Parker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John A.","family":"Cherry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,1,4]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/es801759k"},{"key":"e_1_2_7_3_1","unstructured":"Belan K.P.2010. Characterizing a fracture rock aquifer with hydraulic testing at a contaminated municipal well using flexible liner methods and depth discrete monitoring. MASc thesis University of Guelph 193 pp."},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0146-6380(99)00057-1"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/es803100p"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1021\/es991179k"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/es048592z"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1080\/15275920801888368"},{"key":"e_1_2_7_9_1","first-page":"239","volume-title":"Environmental Isotopes in Biodegradation and Bioremediation","author":"Hunkeler D.","year":"2009"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/es900579z"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jconhyd.2004.03.003"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1021\/es981282u"},{"issue":"6","key":"e_1_2_7_13_1","first-page":"799","article-title":"Plume persistence in fractured sedimentary rock after source zone removal.","volume":"48","author":"Parker B.L.","year":"2010","journal-title":"Ground Water"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1745-6584.1997.tb00180.x"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhydrol.2011.01.055"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/rcm.3170"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/es001227x"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apgeochem.2006.02.006"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/es001583f"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1021\/es011162d"},{"key":"e_1_2_7_21_1","unstructured":"United States Environmental Protection Agency (USEPA).2008. A guide for assessing biodegradation and source identification of organic ground water contaminants using Compound Specific Isotope Analysis (CSIA). EPA 600\/R\u201008\/148."},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/0883-2927(95)00025-9"}],"container-title":["Groundwater"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fj.1745-6584.2011.00897.x","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/ngwa.onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/j.1745-6584.2011.00897.x","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,11,2]],"date-time":"2025-11-02T09:22:17Z","timestamp":1762075337000},"score":1,"resource":{"primary":{"URL":"https:\/\/ngwa.onlinelibrary.wiley.com\/doi\/10.1111\/j.1745-6584.2011.00897.x"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,1,4]]},"references-count":21,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2012,9]]}},"alternative-id":["10.1111\/j.1745-6584.2011.00897.x"],"URL":"https:\/\/doi.org\/10.1111\/j.1745-6584.2011.00897.x","archive":["Portico"],"relation":{},"ISSN":["0017-467X","1745-6584"],"issn-type":[{"value":"0017-467X","type":"print"},{"value":"1745-6584","type":"electronic"}],"subject":[],"published":{"date-parts":[[2012,1,4]]}}}