2. AOACRIChemContMethods-2018Awards

Pang et al.: J ournal of AOAC I nternational V ol. 98, N o. 5, 2015  1445

RSD R ,

% HorRat

S R ,

μg/kg

μg/kg RSD r , %

S r ,

Avg. C., μg/kg

GC/MS (16 laboratories) GC/MS/MS (14 laboratories) LC/MS/MS (24 laboratories) S r , μg/kg RSD r , % S R , μg/kg RSD R , %HorRat No. Pesticide No. of labs Avg. C., μg/kg S r , μg/ kg RSD r , % S R , μg/ kg RSD R , No. of labs 1 Trifluralin 16 359.6 14.2 3.9 60.1 16.7 0.9 1 Trifluralin 14 325.8 19.1 5.9 113.0 34.7 1.8 1 Acetochlor 23 77.5 3.9 5.0 19.9 25.6 1.1 2 Tefluthrin 14 169.3 5.1 3.0 15.1 8.9 0.4 2 Tefluthrin 14 154.5 8.9 5.8 48.7 31.5 1.5 2 Benalaxyl 22 44.5 2.3 5.1 7.5 16.8 0.7 3 Pyrimethanil 15 173.2 4.2 2.4 25.2 14.6 0.7 3 Pyrimethanil 14 167.0 9.2 5.5 49.2 29.4 1.4 3 Bensulide 24 131.7 10.4 7.9 36.4 27.6 1.3 4 Propyzamide 15 209.9 9.1 4.3 31.1 14.8 0.7 4 Propyzamide 13 192.0 10.9 5.7 42.5 22.1 1.1 4 Butralin 22 34.2 2.8 8.2 9.3 27.3 1.0 5 Pirimicarb 14 189.0 6.0 3.2 20.6 10.9 0.5 5 Pirimicarb 13 179.9 9.3 5.2 46.4 25.8 1.2 5 Chlorpyrifos 24 341.9 24.0 7.0 103.3 30.2 1.6 6 Dimethenamid 15 77.6 2.2 2.8 11.5 14.8 0.6 6 Dimethenamid 14 72.4 3.9 5.4 20.4 28.1 1.2 6 Clomazone 22 40.2 3.3 8.1 9.1 22.7 0.9 7 Fenchlorphos 16 320.6 11.0 3.4 54.0 16.9 0.9 7 Fenchlorphos 14 298.8 19.0 6.4 101.9 34.1 1.8 7 Diazinon 23 34.6 1.8 5.3 9.8 28.3 1.1 8 Tolclofos-methyl 13 178.8 3.6 2.0 18.2 10.2 0.5 8 Tolclofos- methyl 13 169.7 8.6 5.1 45.5 26.8 1.3 8 Ethoprophos 24 37.9 3.1 8.1 13.1 34.6 1.3 9 Pirimiphos- methyl 15 170.1 4.2 2.5 24.9 14.7 0.7 9 Pirimiphos- methyl 14 163.1 15.6 9.6 53.4 32.7 1.6 9 Flutolanil 23 44.5 2.7 6.0 9.4 21.1 0.8 ethyl 14 155.6 9.0 5.8 47.0 30.2 1.4 11 Indoxacarb 23 44.0 3.5 8.0 8.2 18.6 0.7 12 4,4’-DDE 15 692.4 24.0 3.5 85.5 12.4 0.7 12 4,4’-DDE 14 630.1 30.8 4.9 183.4 29.1 1.7 12 Kresoxim- methyl 22 441.6 22.7 5.1 84.4 19.1 1.1 methyl 17 Benalaxyl 15 208.0 11.8 5.6 30.9 14.9 0.7 17 Benalaxyl 14 194.1 8.9 4.6 48.1 24.8 1.2 17 Quinoxyfen 24 192.9 13.0 6.7 54.8 28.4 1.4 18 Bifenthrin 15 199.2 11.6 5.8 24.9 12.5 0.6 18 Bifenthrin 14 183.8 9.3 5.0 51.0 27.7 1.3 18 Tebufen- pyrad 24 41.0 2.6 6.3 11.4 27.7 1.1 pylate 14 387.2 22.1 5.7 84.9 21.9 1.2 20 Trifloxys- trobin 24 40.9 2.8 6.9 11.5 28.0 1.1 10 2,4’-DDE 14 700.0 25.2 3.6 70.7 10.1 0.6 10 2,4’-DDE 13 631.5 33.3 5.3 196.0 31.0 1.8 10 Imidacloprid 24 94.6 6.0 6.3 30.6 32.3 1.4 11 Bromophos- ethyl 16 175.1 5.0 2.9 22.3 12.8 0.6 11 Bromophos- 23 36.2 2.5 6.8 8.9 24.5 0.9 16 Chlorfenapyr 15 1642.6 58.5 3.6 199.4 12.1 0.8 16 Chlorfenapyr 13 1511.9 84.7 5.6 332.7 22.0 1.5 16 Propoxur 24 101.2 6.7 6.6 31.5 31.2 1.4 13 Procymidone 15 204.1 6.1 3.0 24.6 12.0 0.6 13 Procymidone 14 186.1 9.8 5.3 54.2 29.2 1.4 13 Monolinuron 24 40.7 3.7 9.1 12.6 31.0 1.2 14 Picoxystrobin 15 416.2 18.3 4.4 42.1 10.1 0.6 14 Picoxystrobin 14 373.6 19.4 5.2 85.3 22.8 1.2 14 Picoxystrobin 22 44.3 3.1 7.0 9.0 20.2 0.8 15 Quinoxyfen 15 193.6 10.1 5.2 22.4 11.6 0.6 15 Quinoxyfen 14 182.4 9.2 5.0 54.1 29.6 1.4 15 Pirimiphos- No. Pesticide No. of labs Avg. C., μg/kg % HorRat No. Pesticide

19 Diflufenican 15 209.4 9.5 4.5 28.1 13.4 0.7 19 Diflufenican 13 191.3 11.6 6.1 41.6 21.7 1.1 19 Triadimefon 23 42.1 2.5 5.8 9.5 22.6 0.9 20 Bromopropylate 15 409.7 21.0 5.1 59.9 14.6 0.8 20 Bromopro-

Table 9. Method efficiency for the determination of 20 pesticides in aged oolong tea by GC/MS, GC/MS/MS, and LC/MS/MS