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Table 7. Mean and standard deviation of pesticide recovery in 30 field-spiked samples determined by gas chromatography/ <br />mass spectrometry (GC/MS) <br />Pesticide Mean recovery Standard deviation <br />Pesticide Mean recovery Standard deviation <br /> (percent) (percent (percent) (percent) <br />Acetochlor 107 7.8 Malathion 89 17 <br />Alachlor 108 9.0 Methyl parathion 96 16 <br />Atrazine 102 7.2 Metolachlor 112 13 <br />Azinphos-methyl 154 62 Metribuzin 74 9.7 <br />Benfluralin 77 ] 2 Molinate 97 4.8 <br />Burylate 105 8.0 Napropamide 102 10 <br />Carbaryl 196 130 Parathion 96 16 <br />Carbofuran 227 310 Pebulate 100 6.9 <br />Chlorpyrifos 89 8.2 Pendimethalin 85 18 <br />Cyanazine 100 15 cis-Permethrin 39 11 <br />DCPA 110 16 Phorate 67 14 <br />p,p'-DDE 60 4.8 Prometon 97 8.0 <br />Deethylatrazine 34 7.6 Pronamide 96 10 <br />Diazinon 97 13 Propachlor 114 12 <br />Dieldrin 99 12 Fropanil 110 15 <br />2,6-Diethylaniline 92 6.9 Fropargite 100 27 <br />Disulfoton 69 14 Simazine 98 6.9 <br />EPTC 107 31 Tebuthiuron 114 27 <br />Ethalfluralin 89 19 Terbacil 75 16 <br />Ethoprop 106 14 Terbufos 77 5.5 <br />Table S. Mean and standard deviation of pesticide recovery in 30field-spiked samples determined by high-performance liquid <br />chromatography (HPLC) <br /> <br />Pesticide Mean recovery Standard deviation <br />Pesticide Mean recovery Standard deviation <br /> (percent) (percent) (percent) (percent) <br />Acifluorfen 85 13 DNOC 78 8.8 <br />Aldicarb 41 11 Fenuron 81 7.4 <br />Aldicarb sulfone 20 16 Fluometuron 85 5.0 <br />Aldicarb sulfoxide 66 13 3-Hydroxy-carbofuran 75 11 <br />Bentazon 78 8.2 Linuron 78 7.0 <br />Bromacil 71 5.9 MCPA 77 7.6 <br />Bromoxynil 85 4.6 MCPB 70 6.4 <br />Carbaryl 75 6.1 Methiocarb 67 4.8 <br />Carbofuran 90 39 Methomyl 77 23 <br />Chlorambenl 75 8.3 Neburon 77 8.8 <br />Chlorothalonil 54 17 Norflurazon 82 6.5 <br />Clopyralid 13 13 Oryzalin 78 30 <br />2,4-D 76 15 Oxamyl 63 8.6 <br />2,4-DB 75 8.9 Picloram 51 26 <br />Dacthal, mono-acid 73 10 Propham 71 9.2 <br />Dicamba 58 27 Propoxur 79 16 <br />Dichlobenil 46 16 Silvex 87 10 <br />Dichlorprop 79 7.9 2,4,5-T 85 2.8 <br />Dinoseb 85 1 l Triclopyr 79 6.6 <br />Diuron 81 6.2 <br />1 Mean recovery and standard deviation are based on seven May 1998 samples <br />20 Pesticides in Surface Waters of the Upper Colorado River Basin, Colorado, 1996-98 <br />