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The analytes are isolated from the pore-water matrix byextraction onto a graphitized carbon-black cartridge. The cartridge is dried under vacuum, and adsorbed analytes are removed by elution with ethyl acetate followed by dichloromethane/methanol (7:3, volume/volume). Water is removed from the ethyl acetate fraction on an anhydrous sodium sulfate column. The combined fractions are solvent exchanged into acetonitrile, evaporated by use of a nitrogen stream, and derivatized by use of N- methyl-N-(tert-butyldimethylsilyl)- trifluoroacetamide. The derivatized extracts are analyzed by capillary-column gaschromatography/electron-impact mass spectrometry in the scan mode. Estimated method detection limits range from 0.03 to 0.07 micrograms per liter. The mean recoveries of all analytes and surrogates determined at 0.74 to 0.82 micrograms per liter in reagent water in soil pore water were 94 percent and 98 percent, respectively. The mean recoveries of all analytes and surrogates determined at 7.4 to 8.2 micrograms per liter in reagent water and in soil pore water were 96 percent and 97 percent,respectively. Recoveries were 90 percent or higher, regardless of analyte concentration or matrix composition, for all compounds excepthydroxyatrazine, whose recoveries were slightly lower (77 percent) at the low concentration.", "description": "v, 12 p. :ill. ;28 cm.", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey ;\r\nBranch of Information Services [distributor]," }, "author": [ { "@type": "Person", "name": "Carter, D.S.", "givenName": "D.S.", "familyName": "Carter" } ] } }, "OpenAlex": { "abstract_inverted_index": { "This": [ 0 ], "report": [ 1 ], "describes": [ 2 ], "a": [ 3, 41, 92 ], "method": [ 4, 118 ], "for": [ 5, 202 ], "the": [ 6, 36, 70, 114, 214 ], "determination": [ 7 ], "of": [ 8, 21, 91, 99, 132, 162, 196 ], "atrazine,": [ 9 ], "desethylatrazine,": [ 10 ], "deisopropylatrazine,": [ 11 ], "didealkylatrazine,": [ 12 ], "and": [ 13, 27, 51, 95, 135, 155, 165, 178, 186 ], "hydroxyatrazine": [ 14 ], "from": [ 15, 35, 69, 122 ], "soil": [ 16, 149, 180 ], "pore": [ 17, 150, 181 ], "waters": [ 18 ], "by": [ 19, 24, 56, 62, 89, 97, 108 ], "use": [ 20, 90, 98 ], "solid-phase": [ 22 ], "extractionfollowed": [ 23 ], "chemical": [ 25 ], "derivatization": [ 26 ], "gas": [ 28 ], "chromatography/mass": [ 29 ], "spectrometry.": [ 30 ], "The": [ 31, 45, 80, 103, 129, 159 ], "analytes": [ 32, 53, 134, 164 ], "are": [ 33, 54, 83, 106 ], "isolated": [ 34 ], "pore-water": [ 37 ], "matrix": [ 38, 200 ], "byextraction": [ 39 ], "onto": [ 40 ], "graphitized": [ 42 ], "carbon-black": [ 43 ], "cartridge.": [ 44 ], "cartridge": [ 46 ], "is": [ 47, 67 ], "dried": [ 48 ], "under": [ 49 ], "vacuum,": [ 50 ], "adsorbed": [ 52 ], "removed": [ 55, 68 ], "elution": [ 57 ], "with": [ 58 ], "ethyl": [ 59, 71 ], "acetate": [ 60, 72 ], "followed": [ 61 ], "dichloromethane/methanol": [ 63 ], "(7:3,": [ 64 ], "volume/volume).": [ 65 ], "Water": [ 66 ], "fraction": [ 73 ], "on": [ 74 ], "an": [ 75 ], "anhydrous": [ 76 ], "sodium": [ 77 ], "sulfate": [ 78 ], "column.": [ 79 ], "combined": [ 81 ], "fractions": [ 82 ], "solvent": [ 84 ], "exchanged": [ 85 ], "into": [ 86 ], "acetonitrile,": [ 87 ], "evaporated": [ 88 ], "nitrogen": [ 93 ], "stream,": [ 94 ], "derivatized": [ 96, 104 ], "N-": [ 100 ], "methyl-N-(tert-butyldimethylsilyl)-": [ 101 ], "trifluoroacetamide.": [ 102 ], "extracts": [ 105 ], "analyzed": [ 107 ], "capillary-column": [ 109 ], "gaschromatography/electron-impact": [ 110 ], "mass": [ 111 ], "spectrometry": [ 112 ], "in": [ 113, 145, 148, 175, 179 ], "scan": [ 115 ], "mode.": [ 116 ], "Estimated": [ 117 ], "detection": [ 119 ], "limits": [ 120 ], "range": [ 121 ], "0.03": [ 123 ], "to": [ 124, 140, 170 ], "0.07": [ 125 ], "micrograms": [ 126, 142, 172 ], "per": [ 127, 143, 173 ], "liter.": [ 128 ], "mean": [ 130, 160 ], "recoveries": [ 131, 161, 207 ], "all": [ 133, 163, 203 ], "surrogates": [ 136, 166 ], "determined": [ 137, 167 ], "at": [ 138, 168, 213 ], "0.74": [ 139 ], "0.82": [ 141 ], "liter": [ 144, 174 ], "reagent": [ 146, 176 ], "water": [ 147, 151, 177, 182 ], "were": [ 152, 183, 190, 208 ], "94": [ 153 ], "percent": [ 154, 185, 192 ], "98": [ 156 ], "percent,": [ 157 ], "respectively.": [ 158 ], "7.4": [ 169 ], "8.2": [ 171 ], "96": [ 184 ], "97": [ 187 ], "percent,respectively.": [ 188 ], "Recoveries": [ 189 ], "90": [ 191 ], "or": [ 193, 199 ], "higher,": [ 194 ], "regardless": [ 195 ], "analyte": [ 197 ], "concentration": [ 198 ], "composition,": [ 201 ], "compounds": [ 204 ], "excepthydroxyatrazine,": [ 205 ], "whose": [ 206 ], "slightly": [ 209 ], "lower": [ 210 ], "(77": [ 211 ], "percent)": [ 212 ], "low": [ 215 ], "concentration.": [ 216 ] }, "apc_list": null, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5044292800", "display_name": "D.S. 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