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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。
In order to accurately determine the suspending rate of 40% B-Ammonium carbonate emulsions, the feasibility of the extraction method and the steam-drying method were compared. The results showed that the extraction rates of different formulations were different. The extraction rates of acetochlor were 64.7% -83.9% after four times of extraction and 84.6% -93.8% for atrazine. Therefore, it is not suitable for the extraction of B · ametry green formulations suspension rate. The sample was distilled to a water content of 40% -60% with a water bath of (80 ± 1) ℃. The recoveries of atrazine, acetochlor and chlorotoluron were between 99.6% and 100.2%. The coefficient of variation Between 0.43% ~ 0.62%.