乙代混剂中三乙膦酸铝对代森锰锌稳定性的影响

The Stability of Mancozeb in the Mixture (phosethyl-Al+mancozeb) by Xanthated Method

本文采用黄原酸盐法，测定了热贮前后乙代混剂中代森锰锌含量的变化；同时还测定了乙代混剂水溶液中代森锰锌的相对分解率，并探讨了温度（２０℃、３０℃）和放置时间（１ｈ、６ｈ、１２ｈ）对其稳定性的影响。试验结果表明，代森锰锌单剂热稳定性较差。相对分解率达１４．３％，与其它样品相比差异显著，代森锰锌在水中和０．１０％三乙膦酸铝水溶液中的相对分解率（２０℃、１２ｈ）分别为３１．５％和１８．５％。合理配比混剂中的三乙膦酸铝是代森锰锌的稳定剂。

The xanthated method was used for determination of mancozed in the mixture (phosethyl-Al+mancozeb) by heating storage and in aqueous solution of the mixture, respectively. The relative rate of resolution of mancozeb was 14. 3%after accelerated storage by heating. It was different significantly from the others.It was evaluated in aqueous solutions of phosethyl- Al (0%, 0. 05%, 0. 10%, 0.20%).The effects of temperature (20℃, 30℃ )and time (1h, 6h, 12h ) of water bath on it at same time was studied. The relative rate of mancozeb in water (20℃,12h) and in an aqueous solution of phosethyl-Al (0. 10%,20℃, 12h) were 31. 5%and 18. 5%,respectively. Phoosethyl-Al in correct mixture (phosethylAl+mancozeb) is a stabilizer of mancozeb.