Herbicide accuracy and precision data table, reference standard

NYC 9/11 Public Portal Document

TABLE 2. SINGLE LABORATORY ACCURACY AND PRECISION FOR ANALYTES FROM REAGENT WATER AND SYNTHETIC GROUNDWATERS’ Reagent Water Synthetic Water T' Cone Analyte Pg/L R” Sr' R Sr Acifluorfen 0.2 121 15.7 103 20.6 Bentazon 1 120 16.8 82 37.7 Chloramben 0.4 111 14.4 112 10.1 2,4-D 1 131 27.5 110 5.5 Dalapon 10 100 20.0 128 30.7 t#i5

2,4-DB 4 87 13.1 0 0 DCPA Acid Metabolites 0.2 74 9.7 81 21.9 Dicamba 0.4 135 32.4 92 17.5 3,5-Dichlorobenzoic Acid 0.6 102 16.3 82 7.4 Dichlorprop 2 107 20.3 106 5.3 Dinoseb 0.4 42 14.3 89 13.4 5-Hydroxydicamba 0.2 103 16-5 88 5.3 4-Nitrophenol 1 131 23.6 127 34.3 Pentachlorophenol (PCP) 0.04 130 31.2 84 9.2 Picloram 0.6 91 15.5 97 23.3 2,4,5-T 0.4 117 16.4 96 3.8 2,4,5-TP 0.2 134 30.8 105 6.3 “Data corrected for amount detected in blank and represent the mean of seven to eight samples.. '’R = average percent recovery. ‘Sr = 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.

515.1-29

NYC-WTC_000061725