Item talk:Q230743
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{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Determination of submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples by solid-phase extraction and liquid chromatography", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70022012", "url": "https://pubs.usgs.gov/publication/70022012" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70022012 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1093/jaoac/82.1.161", "url": "https://doi.org/10.1093/jaoac/82.1.161" } ], "journal": { "@type": "Periodical", "name": "Journal of AOAC International", "volumeNumber": "82", "issueNumber": "1" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Journal of AOAC International" } ], "datePublished": "1999", "dateModified": "2021-05-28", "abstract": "A method for determining submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples has been developed. Caffeine is extracted from a 1 L water sample with a 0.5 g graphitized carbon-based solid-phase cartridge, eluted with methylene chloride-methanol (80 + 20, v/v), and analyzed by liquid chromatography with photodiode-array detection. The single-operator method detection limit for organic-free water samples was 0.02 \u03bcg/L. Mean recoveries and relative standard deviations were 93 \u00b1 13% for organic- free water samples fortified at 0.04 \u03bcg/L and 84 \u00b1 4% for laboratory reagent spikes fortified at 0.5 \u03bcg/L. Environmental concentrations of caffeine ranged from 0.003 to 1.44 \u03bcg/L in surface water samples and from 0.01 to 0.08 \u03bcg/L in groundwater samples.", "description": "6 p.", "publisher": { "@type": "Organization", "name": "Oxford Academic" }, "author": [ { "@type": "Person", "name": "Burkhardt, M.R.", "givenName": "M.R.", "familyName": "Burkhardt" }, { "@type": "Person", "name": "Soliven, P.P.", "givenName": "P.P.", "familyName": "Soliven" }, { "@type": "Person", "name": "Werner, S.L.", "givenName": "S.L.", "familyName": "Werner" }, { "@type": "Person", "name": "Vaught, D.G.", "givenName": "D.G.", "familyName": "Vaught" } ], "funder": [ { "@type": "Organization", "name": "National Water Quality Laboratory", "url": "https://www.usgs.gov/labs/national-water-quality-laboratory" } ] }, "OpenAlex": { "abstract_inverted_index": { "Abstract": [ 0 ], "A": [ 1 ], "method": [ 2, 53 ], "for": [ 3, 56, 73, 86 ], "determining": [ 4 ], "submicrogram-per-liter": [ 5 ], "concentrations": [ 6, 95 ], "of": [ 7, 96 ], "caffeine": [ 8, 97 ], "in": [ 9, 104, 114 ], "surface": [ 10, 105 ], "water": [ 11, 25, 58, 76, 106 ], "and": [ 12, 43, 65, 82, 108 ], "groundwater": [ 13, 115 ], "samples": [ 14, 59, 77, 107 ], "has": [ 15 ], "been": [ 16 ], "developed.": [ 17 ], "Caffeine": [ 18 ], "is": [ 19 ], "extracted": [ 20 ], "from": [ 21, 99, 109 ], "a": [ 22, 28 ], "1": [ 23 ], "L": [ 24 ], "sample": [ 26 ], "with": [ 27, 36, 48 ], "0.5": [ 29, 92 ], "g": [ 30 ], "graphitized": [ 31 ], "carbon-based": [ 32 ], "solid-phase": [ 33 ], "cartridge,": [ 34 ], "eluted": [ 35 ], "methylene": [ 37 ], "chloride-methanol": [ 38 ], "(80": [ 39 ], "+": [ 40 ], "20,": [ 41 ], "v/v),": [ 42 ], "analyzed": [ 44 ], "by": [ 45 ], "liquid": [ 46 ], "chromatography": [ 47 ], "photodiode-array": [ 49 ], "detection.": [ 50 ], "The": [ 51 ], "single-operator": [ 52 ], "detection": [ 54 ], "limit": [ 55 ], "organic-free": [ 57 ], "was": [ 60 ], "0.02": [ 61 ], "\u03bcg/L.": [ 62, 93 ], "Mean": [ 63 ], "recoveries": [ 64 ], "relative": [ 66 ], "standard": [ 67 ], "deviations": [ 68 ], "were": [ 69 ], "93": [ 70 ], "\u00b1": [ 71, 84 ], "13%": [ 72 ], "organic-": [ 74 ], "free": [ 75 ], "fortified": [ 78, 90 ], "at": [ 79, 91 ], "0.04": [ 80 ], "\u03bcg/L": [ 81, 103, 113 ], "84": [ 83 ], "4%": [ 85 ], "laboratory": [ 87 ], "reagent": [ 88 ], "spikes": [ 89 ], "Environmental": [ 94 ], "ranged": [ 98 ], "0.003": [ 100 ], "to": [ 101, 111 ], "1.44": [ 102 ], "0.01": [ 110 ], "0.08": [ 112 ], "samples.": [ 116 ] }, "apc_list": { "value": 1711, "currency": "USD", "value_usd": 1711, "provenance": "doaj" }, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5059239282", "display_name": "Mark R. 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