Study on Determining the Suspending Rate of 40% Acetochlor+Atrazine+Chlorotoluron SE

In order to determine exactly the suspending rate of 40% acetochlor+atrazine+chlorotoluron SE, we compared the extraction with the way of evaporation to dryness. Different herbicide formulations had different extracting rate and the quartet extracting rate of acetochlor ranged from 64.7% to 83.9%, atrazine from 84.6% to 93.8%, so the extraction is not proper. Taking the water bath which temperature was (80±1)℃ and evaporating the samples to the remain content of water from 40% to 60%, the recovery of atrazine , acetochlor and chlorotoluron ranged from 99.6% to 100.2%, and the CVs ranged from 0.64% to 0.68%.