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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).