| In this paper,16 laboratories were chosen through open recruitment on the internet and verifications of their qualifications,and international AOAC collaborative study protocol and blind samples for determinations as well as testing materials necessary were shipped to each laboratory by AOAC Study Director in accordance with the guidelines of AOAC method evaluation.The collaborative laboratories tested the blind samples and sent back the analytical results to AOAC Study Director.The statistical results showed that two labs of them should be eliminated as they deviated from the protocol in some major operational procedures.For the remaining 14 labs：GC-MS/SIM （GC-MS/MS）：RSDr＜8% accounts for 100%,RSDR＜16% makes up 57.5%，RSDR＜25% accounts for 92.5%,HorRat values that are less than 1.0 account for 80.0%，HorRat values that are less than 2.0 account for 97.5%;LC-MS/MS:RSDr＜8% accounts for 65.0%，RSDr＜15% makes up 97.5%,RSDR＜16% accounts for 35.0%，RSDR＜25% makes up 95.0%,HorRat values that are less than 1.0 account for 92.5%,HorRat values that are less than 2.0 account for 97.5%1 220 target pesticide calibration curves were established,1 132 with r2 values satisfying the requirements of ≥0.995,making up 92.8%.Target ion abundance data were 3 600,3 443 is conforming to EU standard in abundance ratio,accounting for 95.6%.By these results,the method was proved to have good repeatability and reproducibility,and was suitable for the determination of multiple pesticide residues in tea. |