THE ASSESSMENT OF THE AMOUNT OF PLANT PROTECTION CHEMICALS IN SOME HIGH-RISK AREAS IN THAI BINH PROVINCE USING GAS CHROMATOGRAPHY-MASS SPECTROMETRY (GC / MS) From the findings of the study, we draw some conclusions as follows: - There were no pesticide residues detected in all samples analyzing the amount of two types of pesticides in the group of persistent organochlorine which used to be common, namely DDT and Aldrin in the neighborhood of Tan Binh pesticide warehouse and the old warehouse in Minh Khai commune, Vu Thu.