Method-performance Studies of Notified Analytical Method for Esprocarb and Other 4 Pesticides.

Method-performance studies were conducted for the notified revised analytical method for esprocarb, chlorpropham, thiobencarb, pyributicarb and pendimethalin. The five pesticides spiked in rice, soybeans, potato, cabbage, onion, cucumber, radish and lemon at the level of 0.1 mu g/g were analyzed in replicate in 6 laboratories. Means of esprocarb recoveries ranged from 89.0 to 99.4%. Repeatability relative standard deviations (RSDr) of the recoveries in each crop ranged from 1.5 to 9.1% and reproducibility relative standard deviations (RSDR) ranged from 8.8 to 14.8%. Means of chlorpropham recoveries ranged from 91.7 to 102.0%. The RSDr and RSDR ranged from 1.1 to 6.5% and from 7.9 to 17.3%, respectively. For thiobencarb, the means of recoveries, RSDr and RSDR were 87.2 similar to 102.2%, 1.7 similar to 6.1% and 8.9 similar to 16.4%, respectively. For pyributicarb, the means of recoveries, RSDr and RSDR were 87.8 similar to 96.0%, 2.4 similar to 9.6% and 8.5 similar to 14.4%, respectively. For pendimethalin, they were 88.6 similar to 99.4%, 2.7 similar to 8.5% and 8.1 similar to 16.4%. Detection limits were 0.0001 similar to 0.01 mu g/g for pyributicarb and 0.00005 similar to 0.005 mu g/g for the other 4 pesticides.