40%乙·莠·绿悬乳剂悬浮率测定方法研究

为准确测定40%乙·莠·绿悬乳剂的悬浮率,比较了萃取法与蒸干法的可行性。试验证明不同配方制剂萃取率不同,萃取4次后的萃取率乙草胺在64.7%～83.9%之间,莠去津在84.6%～93.8%之间。故对于乙·莠·绿制剂不适合采用萃取法测定悬浮率。采用(80±1)℃水浴将样品蒸至含水量在40%～60%之间,该方法莠去津、乙草胺和绿麦隆的回收率在99.6%～100.2%之间,变异系数在0.43%～0.62%之间。

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%.