Abstract:In this work, organophosphorus and carbamates pesticide residues of 80 samples obtained from four breeds of vegetables including Chinese cabbage (Brassica campestris L.), lettuce (Lactuca sativa L. var. ramosa Hort.), flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee) and Romaine lettuce (Lactuca sativa var longifoliaf. L.) from local markets in Zhanjiang were detected by enzyme inhibition method according to national standard GB/T 5009.199-2003. Effects of different washing methods (washing with water, salt, rice washing water and edible baking soda respectively) on the pesticide residues in flowering Chinese cabbage and Romaine lettuce were studied. The results showed that the pesticide was found in all samples and the detection rate was 100%.Three samples, which were all Chinese cabbage, were proved to exceed the national standard, and the over standard pesticide residues rate was 0.094%. Four kinds of washing methods all affected the pesticide residues removement from vegetables, and the removement rates were from 9.91% to 96.26%. Compared to the other three methods, the salt water washing had the best effect on wiping out pesticide from the vegetables. The optimal washing effect for flowering Chinese cabbage and Romaine lettuce was soaked in 10‰ of salt water for 20 min.
