论文部分内容阅读
采用高效液相色谱和ＧＣ－ＭＳ，研究了在自然条件下贮藏５年的代森锰锌（ＭＺ）制剂的降解。样品用甲醇抽提，测定后经联机检索解析，确定了ＭＺ制剂的主要降解产物和途径。ＭＺ的主要降解产物和途径与一般的ＥＢＤＣｓ相似。ＭＺ的主要降解产物为ＥＴＵ、ＥＤＩ、ＥＵ等，主要降解途径为氧化。按照热贮藏方法（ＣＩＰＡＣＭＴ４６），采用黄原酸盐法测定了ＭＺ制剂单剂的稳定性，对ＭＺ＋ｆｏｓｅｔｈｙｌＡｌ、ＭＺ＋ｃｈｌｏｒｏｔｈａｌｏｎｉｌ、ＭＺ＋ｍｅｔａｌａｘｙｌ、ＭＺ＋ｃａｒｂｅｎｄａｚｉｍ、ＭＺ＋ｔｒｉａｄｉｍｅｆｏｎ和ＭＺ＋ｄｉｍｅｔｈａｃｈｌｏｎ中的ＭＺ稳定性也进行了考察，还对在实验室条件下贮藏２年后的混剂中的ＥＴＵ进行了测定。ＭＺ的热贮相对分解率为９３％～１４３％。贮藏２年的ＭＺ制剂中ＥＴＵ含量为３９６％，５年的为６９３％。ｆｏｓｅｔｈｙｌＡｌ，ｃａｒｂｅｎｄａｚｉｍ和ｔｒｉａｄｉｍｅｆｏｎ可以显著地提高ＭＺ的热贮稳定性。５种混剂贮藏２年后ＥＴＵ含量为１９１％～３１１％（ＭＺ＋ｄｉｍｅｔｈａｃｈｌｏｎ未测定）。
The degradation of mancozeb (MZ) preparations stored under natural conditions for 5 years was studied by high performance liquid chromatography and GC-MS. The sample was extracted with methanol. After the determination, it was analyzed by on-line search to determine the main degradation products and pathways of MZ preparation. The major degradation products and pathways of MZ are similar to those of normal EBDCs. The main degradation products of MZ are ETU, EDI, EU, etc. The main degradation pathway is oxidation. The stability of a single dose of MZ preparation was also determined by the method of xanthogenate (CIPACMT46). The stability of MZ in MZ + fosethylAl, MZ + chlorothalonil, MZ + metalaxyl, MZ + carbendazim, MZ + triadimefon and MZ + dimethachlon was also investigated. The ETU in the mixture after 2 years of storage under laboratory conditions was determined. MZ heat storage relative decomposition rate of 9 3% ~ 14 3%. The content of ETU in MZ preparations stored for 2 years was 3 96% and 6 93% in 5 years. fosethyl-Al, carbendazim and triadimefon can significantly improve the heat storage stability of MZ. After 5 years of storage, the content of ETU was 191% ~ 311% after 2 years of storage (MZ + dimethachlon was not measured).