Laboratory accuracy and precision table for analytes

NYC 9/11 Public Portal Document

TABLE 2. SINGLE LABORATORY ACCURACY AND PRECISION FOR ANALYTES FROM REAGENT WATER AND SYNTHETIC GROUNDWATERS’ Syrithetic Synthetic Fortified Reagent Water Water I** Water 2’ Cone. Analyte lig/L R** Sr' R Sr R Sr Aldrin 0.15 “86 9.5 100 11.0 69 9.0 Chlordane-alpha 0.15 99 11.9 96 12.5 99 7.9 Chlordane-gamma 0.15 99 11.9 96 12.5 99 6.9 Chlorneb 5.0 97 11.6 95 6.7 75 8.3 Chlorobenzilate 10 108 5.4 98 10.8 102 9.2 Chlorthalonil 0.25 91 8.2 103 10.3 71 9.2 DCPA 0.25 103 12.4 100 13.0 101 6.1 4,4’-DDD 0.25 107 6.4 96 8.6 101 7.1 4,4'-DDE 0.10 99 11.9 96 12.5 99 6.9 4,4'-DDT 0.60 112 16.8 98 11.8 84 8.4 Dieldrin 0.20 87 8.7 103 9.3 82 7.4 Endosulfan I 0.15 87 8.7 102 8.2 84 12.2 Endosulfan Sulfate 0.15 102 15.3 94 1.3 72 9.4 Endrin 0.15 88 8.8 98 9.8 104 9.2 Endrin Aldehyde 0.25 88 7.9 103 11.3 84 6.8 Endosulfan II 0.15 92 10.1 98 10.8 76 3.9 Etridiazole 0.25 103 6.2 91 6.4 98 7.7 HCH-alpha 0.05 92 10.1 106 7.4 86 6.0 HCH-beta 0.10 95 6.7 92 5.5 100 6.2 HCH-delta 0.10 102 11.2 99 11.9 103 7.7 HCH-gamma 0.15 89 9.8 115 6.9 85 7.7 Heptachlor 0.10 98 11.8 85 11.1 85 9.8 Heptachlor Epoxide 0.15 87 8.7 103 7.2 82 4.8 Hexachlorobenzene 0.05 99 21.8 82 9.8 68 6.2 Methoxychlor 0.5 105 13.7 101 10.1 104 9.5 cis-Permethrin 5.0 91 9.1 96 11.5 86 7.1 trans-Permethrin 5.0 111 6.7 97 9.7 102 7.6 Propachlor 5.0 103 9.3 116 4.6 95 9.6 Trifluralin 0.25 103 5.2 86 10.3 87 ’Data corrected for amount detected in blank and represent the mean of seven to eight samples. ’’R = average percent recovery. = standard deviation of the percent recovery. ^Corrected for amount found in blank; Absopure Nature Artesian Spring Water Obtained from the Absopure Water Company in Plymouth, Michigan. ’Corrected for amount found in blank; reagent water fortified with fulvic acid at the 1 mg/L concentration level. A well-characterized fulvic acid, available from the International Humic Substances Society (associated with the United States Geological Survey in Denver, Colorado), was used.

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NYC-WTC_000078425