Evaluation of uncertainty in determination of cypermethrin in vegetable
Abstract: According to NY/T 761-2004, the uncertainty in determination of cypermethrin residue is divided into 5 different parts in this paper, including weighting, extract, cleansing, determining by GC, and the correct factor as a token of repeating test and sample. The results shows that an expanded uncertainty 0.0020 mg/kg(k= 2) is obtained as the residue of cypermethrin at 0.1026 mg/kg. In the process of the test, the correct factor and repeat determination value are the main factor in the measurement uncertainty assessing.
Key words: cypermethrin; residue; uncertainty