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Long-term method detection levels (LT-MDLs) for MTBE, TAME, DIPE, and ETBE ranged from 15 to 83 nanograms per liter (0.015 to 0.083 microgram per liter). Nanogram-per-liter-concentration detections are reported if all of the identification criteria are met, whereas previous methods censored detections at a pre-determined method reporting level. The reporting level for this method is defined as two times the LT-MDL, does not censor detections at less than this concentration, and is referred to as the nondetection value (NDV). Bias and variability data from multiple analyses, analysts, and instruments over a 60-day period show the oxygenate recoveries ranging from 100 to 109 percent, with 6 to 8 percent relative standard deviation. MTBE, TAME, DIPE, and ETBE were not detected in the analysis of 225 laboratory reagent blanks from January to December 1997. A preservation study in ground water and surface water indicates that all the oxygenates are stable at pH 2 for up to 216 days, with recoveries ranging from 94 to 115 percent on day 216, and relative standard deviations ranging from 5 to 9 percent for the duration of the study.", "description": "6 p.", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Raese, Jon W. jwraese@usgs.gov", "givenName": "Jon W.", "familyName": "Raese", "email": "jwraese@usgs.gov" }, { "@type": "Person", "name": "Connor, Brooke F. bfconnor@usgs.gov", "givenName": "Brooke F.", "familyName": "Connor", "email": "bfconnor@usgs.gov" }, { "@type": "Person", "name": "Rose, Donna L. dlrose@usgs.gov", "givenName": "Donna L.", "familyName": "Rose", "email": "dlrose@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0003-1216-9914", "url": "https://orcid.org/0000-0003-1216-9914" }, "affiliation": [ { "@type": "Organization", "name": "Branch of Analytical Serv (NWQL)", "url": "https://www.usgs.gov/labs/national-water-quality-laboratory" } ] }, { "@type": "Person", "name": "Abney, Sonja R.", "givenName": "Sonja R.", "familyName": "Abney" } ], "funder": [ { "@type": "Organization", "name": "National Water Quality Laboratory", "url": "https://www.usgs.gov/labs/national-water-quality-laboratory" }, { "@type": "Organization", "name": "U.S. Geological Survey", "url": "https://www.usgs.gov/" } ] } }, "OpenAlex": { "abstract_inverted_index": { "This": [ 0 ], "Fact": [ 1 ], "Sheet": [ 2 ], "presents": [ 3 ], "data": [ 4, 122 ], "for": [ 5, 45, 91, 191, 217 ], "analysis": [ 6, 161 ], "of": [ 7, 10, 71, 162, 220 ], "nanogram-per-liter": [ 8 ], "concentrations": [ 9 ], "methyl": [ 11, 22 ], "tert-butyl": [ 12, 31 ], "ether": [ 13, 18, 24, 27, 32 ], "(MTBE)": [ 14 ], "and": [ 15, 29, 49, 110, 120, 127, 154, 178, 207 ], "three": [ 16 ], "other": [ 17 ], "gasoline": [ 19 ], "oxygenates,": [ 20 ], "including": [ 21 ], "tert-pentyl": [ 23 ], "(TAME),": [ 25 ], "diisopropyl": [ 26 ], "(DIPE),": [ 28 ], "ethyl": [ 30 ], "(ETBE),": [ 33 ], "by": [ 34 ], "purge-": [ 35 ], "and-trap": [ 36 ], "capillary-column": [ 37 ], "gas": [ 38 ], "chromatography.": [ 39 ], "Long-term": [ 40 ], "method": [ 41, 85, 93 ], "detection": [ 42 ], "levels": [ 43 ], "(LT-MDLs)": [ 44 ], "MTBE,": [ 46, 151 ], "TAME,": [ 47, 152 ], "DIPE,": [ 48, 153 ], "ETBE": [ 50, 155 ], "ranged": [ 51 ], "from": [ 52, 123, 138, 167, 199, 212 ], "15": [ 53 ], "to": [ 54, 60, 113, 140, 145, 169, 193, 201, 214 ], "83": [ 55 ], "nanograms": [ 56 ], "per": [ 57, 63 ], "liter": [ 58 ], "(0.015": [ 59 ], "0.083": [ 61 ], "microgram": [ 62 ], "liter).": [ 64 ], "Nanogram-per-liter-concentration": [ 65 ], "detections": [ 66, 81, 104 ], "are": [ 67, 75, 186 ], "reported": [ 68 ], "if": [ 69 ], "all": [ 70, 183 ], "the": [ 72, 99, 115, 134, 160, 184, 218, 221 ], "identification": [ 73 ], "criteria": [ 74 ], "met,": [ 76 ], "whereas": [ 77 ], "previous": [ 78 ], "methods": [ 79 ], "censored": [ 80 ], "at": [ 82, 105, 188 ], "a": [ 83, 130 ], "pre-determined": [ 84 ], "reporting": [ 86, 89 ], "level.": [ 87 ], "The": [ 88 ], "level": [ 90 ], "this": [ 92, 108 ], "is": [ 94, 111 ], "defined": [ 95 ], "as": [ 96, 114 ], "two": [ 97 ], "times": [ 98 ], "LT-MDL,": [ 100 ], "does": [ 101 ], "not": [ 102, 157 ], "censor": [ 103 ], "less": [ 106 ], "than": [ 107 ], "concentration,": [ 109 ], "referred": [ 112 ], "nondetection": [ 116 ], "value": [ 117 ], "(NDV).": [ 118 ], "Bias": [ 119 ], "variability": [ 121 ], "multiple": [ 124 ], "analyses,": [ 125 ], "analysts,": [ 126 ], "instruments": [ 128 ], "over": [ 129 ], "60-day": [ 131 ], "period": [ 132 ], "show": [ 133 ], "oxygenate": [ 135 ], "recoveries": [ 136, 197 ], "ranging": [ 137, 198, 211 ], "100": [ 139 ], "109": [ 141 ], "percent,": [ 142 ], "with": [ 143, 196 ], "6": [ 144 ], "8": [ 146 ], "percent": [ 147, 203, 216 ], "relative": [ 148, 208 ], "standard": [ 149, 209 ], "deviation.": [ 150 ], "were": [ 156 ], "detected": [ 158 ], "in": [ 159, 175 ], "225": [ 163 ], "laboratory": [ 164 ], "reagent": [ 165 ], "blanks": [ 166 ], "January": [ 168 ], "December": [ 170 ], "1997.": [ 171 ], "A": [ 172 ], "preservation": [ 173 ], "study": [ 174 ], "ground": [ 176 ], "water": [ 177, 180 ], "surface": [ 179 ], "indicates": [ 181 ], "that": [ 182 ], "oxygenates": [ 185 ], "stable": [ 187 ], "pH": [ 189 ], "2": [ 190 ], "up": [ 192 ], "216": [ 194 ], "days,": [ 195 ], "94": [ 200 ], "115": [ 202 ], "on": [ 204 ], "day": [ 205 ], "216,": [ 206 ], "deviations": [ 210 ], "5": [ 213 ], "9": [ 215 ], "duration": [ 219 ], "study.": [ 222 ] }, "apc_list": null, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5025231313", "display_name": "Donna L. 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