AOAC RI Chemical Cont. Methods-2018 Awards

1442 Pang et al.: J ournal of AOAC I nternational V ol. 98, N o. 5, 2015

RSD R ,

% HorRat

S R ,

μg/kg

μg/kg RSD r , %

S r ,

Avg.

rec., %

Green tea Oolong tea

Avg. C., μg/ kg Rec. %

μg/kg No.6 No.7

Avg. C.,

1 Acetochlor 20 37.9 37.6 37.9 94.8 94.0 94.4 2.2 5.7 3.2 8.4 0.3 23 18.1 18.3 18.2 90.6 91.6 91.1 1.1 6.2 4.0 21.7 0.7 2 Benalaxyl 22 19.3 19.7 19.5 96.6 98.7 97.7 1.3 6.7 2.3 12.0 0.4 23 9.0 9.1 9.0 90.2 90.8 90.5 0.5 5.8 1.5 17.0 0.5 3 Bensulide 22 55.0 57.8 56.4 91.6 96.3 94.0 4.1 7.3 7.8 13.9 0.6 23 25.8 25.7 25.8 86.0 85.7 85.8 2.3 8.9 6.2 24.2 0.9 4 Butralin 21 18.3 18.2 18.2 91.3 91.2 91.3 1.4 7.4 2.3 12.8 0.4 22 8.5 8.5 8.5 84.9 84.6 84.7 0.5 6.2 2.2 26.2 0.8 5 Chlorpyrifos 19 185.2 183.7 185.3 92.6 91.8 92.2 9.6 5.2 18.7 10.1 0.5 22 83.5 86.9 84.3 83.5 86.9 85.2 5.7 6.8 25.0 29.7 1.3

6 Clomazone 23 18.9 18.7 18.9 94.7 93.3 94.0 1.3 6.7 2.1 11.2 0.4 22 8.9 9.0 8.9 88.6 90.4 89.5 0.3 3.8 2.0 22.7 0.7 7 Diazinon 22 19.4 19.0 19.2 96.9 95.0 96.0 0.9 4.9 2.6 13.4 0.5 20 9.2 9.2 9.2 92.3 92.2 92.2 0.3 3.6 1.3 13.6 0.4 8 Ethoprophos 23 19.0 18.7 18.9 95.1 93.6 94.3 1.2 6.5 2.5 13.2 0.5 22 8.7 8.8 8.7 86.8 87.8 87.3 0.5 5.5 1.9 21.5 0.7 9 Flutolanil 23 19.1 19.1 19.2 95.3 95.7 95.5 1.4 7.5 2.5 13.0 0.4 23 8.7 8.9 8.8 87.3 88.8 88.0 0.4 5.1 1.9 21.3 0.7 10 Imidacloprid 23 42.7 42.1 42.6 94.8 93.5 94.2 3.3 7.7 5.3 12.4 0.5 23 19.5 19.9 19.7 86.9 88.3 87.6 1.2 6.2 5.4 27.4 0.9 11 Indoxacarb 23 19.0 18.7 18.9 95.0 93.6 94.3 1.3 6.7 2.4 12.7 0.4 22 9.1 9.6 9.3 91.4 96.0 93.7 0.8 8.2 2.1 22.7 0.7

12 Kresoxim-methyl 20 200.5 189.6 191.8 100.2 94.8 97.5 15.9 8.3 25.1 13.1 0.6 22 81.6 88.0 83.7 81.6 88.0 84.8 8.5 10.2 18.9 22.5 1.0 13 Monolinuron 23 19.0 18.6 18.9 95.0 93.1 94.0 1.5 7.9 2.5 13.4 0.5 22 9.0 9.2 9.1 90.0 92.4 91.2 0.6 6.2 1.8 19.2 0.6 14 Picoxystrobin 21 19.4 18.8 19.0 97.2 94.0 95.6 1.3 6.8 2.3 12.1 0.4 23 8.9 9.0 8.9 88.5 89.6 89.1 0.8 8.9 2.1 24.1 0.7 15 Pirimiphos- methyl 23 19.3 19.2 19.3 96.6 96.0 96.3 1.0 5.3 2.6 13.5 0.5 22 9.1 8.9 9.1 91.2 89.3 90.2 0.4 4.6 1.7 19.1 0.6 16 Propoxur 23 47.7 47.4 47.9 95.3 94.9 95.1 4.5 9.4 8.2 17.1 0.7 23 21.9 22.4 22.2 87.7 89.8 88.7 1.4 6.1 6.1 27.4 1.0 17 Quinoxyfen 22 92.9 92.1 92.7 92.9 92.1 92.5 4.7 5.0 12.8 13.8 0.6 23 41.1 41.4 41.2 82.2 82.8 82.5 2.5 6.0 9.5 23.1 0.9 18 Tebufenpyrad 23 18.7 18.8 18.8 93.6 94.1 93.8 1.1 6.0 2.5 13.5 0.5 23 8.9 8.9 8.9 89.2 89.0 89.1 0.6 6.4 2.4 26.8 0.8 19 Triadimefon 22 18.9 19.1 19.1 94.4 95.7 95.1 1.2 6.4 2.7 13.9 0.5 22 9.5 9.3 9.4 94.8 92.5 93.7 0.5 4.8 1.9 20.1 0.6 20 Trifloxystrobin 21 19.3 19.1 19.3 96.4 95.4 95.9 1.2 6.1 2.0 10.5 0.4 23 8.9 8.9 8.9 89.2 89.4 89.3 0.4 4.9 2.1 23.9 0.7

labs` No.6 No.7

No. of

μg/kg RSD r , % μg/kg RSD R , % HorRat

S R ,

S r ,

Avg.

rec., %

μg/kg Rec., %

μg/kg No. 1 No. 2

Avg. C.,

Avg. C.,

labs No. 1 No. 2

No. of

No. Pesticide

Table 6. Method efficiency for the determination of 20 pesticides in fortified tea samples by LC/MS/MS (24 laboratories)