Item talk:Q256913
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{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Comparison of downhole and surface sampling for the determination of volatile organic compounds (VOCs) in ground water", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70205830", "url": "https://pubs.usgs.gov/publication/70205830" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70205830 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1111/j.1745-6592.1992.tb00418.x", "url": "https://doi.org/10.1111/j.1745-6592.1992.tb00418.x" } ], "journal": { "@type": "Periodical", "name": "Ground Water Monitoring Review", "volumeNumber": "12", "issueNumber": "1" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Ground Water Monitoring Review" } ], "datePublished": "1992", "dateModified": "2019-10-07", "abstract": "The relative precision and accuracy of sampling and analysis methods for the determination of trace concentrations of volatile organic compounds (VOCs) in ground water were compared. Samples were collected from a well containing nanogram\u2010per\u2010liter (ng/L) to microgram\u2010per\u2010liter (\u03bcg/L) levels of VOCs. A Keck helical rotor submersible pump was used to collect samples at the surface for analysis by purge and trap (P&T) and for analysis by adsorption/thermal desorption (ATD). Downhole samples were collected by passing water through an ATD cartridge. Although slight spontaneous bubble outgassing occurred when the water was brought to the surface, the relative precisions and comparabilities of the surface and downhole methods were generally found to be equivalent from a statistical point of view. A main conclusion of this study is that bringing sample water to the surface for placement in VOC vials (and subsequent analysis by P&T) can be done reliably under many circumstances. However, care must still be taken to prevent adsorption losses and cross contamination. Samples subject to strong bubble outgassing will need to be handled in a special fashion (e.g., by downhole ATD) to minimize volatilization losses. Additionally, the higher sensitivity of the ATD method allows lower detection limits than are possible with P&T. For example, several compounds present at the ng/L level could be determined with confidence by ATD, but not by P&T.", "description": "8 p.", "publisher": { "@type": "Organization", "name": "Wiley" }, "author": [ { "@type": "Person", "name": "Rosen, M. E.", "givenName": "M. E.", "familyName": "Rosen" }, { "@type": "Person", "name": "James F. Pankow,", "familyName": "James F. Pankow", "affiliation": [ { "@type": "Organization", "name": "Portland State University" } ] }, { "@type": "Person", "name": "Gibs, Jacob jgibs@usgs.gov", "givenName": "Jacob", "familyName": "Gibs", "email": "jgibs@usgs.gov" }, { "@type": "Person", "name": "Imbrigiotta, Thomas E. timbrig@usgs.gov", "givenName": "Thomas E.", "familyName": "Imbrigiotta", "email": "timbrig@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0003-1716-4768", "url": "https://orcid.org/0000-0003-1716-4768" }, "affiliation": [ { "@type": "Organization", "name": "New Jersey Water Science Center", "url": "https://www.usgs.gov/centers/new-jersey-water-science-center" } ] } ], "funder": [ { "@type": "Organization", "name": "New Jersey Water Science Center", "url": "https://www.usgs.gov/centers/new-jersey-water-science-center" } ], "spatialCoverage": [ { "@type": "Place", "additionalType": "country", "name": "United States", "url": "https://geonames.org/4074035" }, { "@type": 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