纯白为无色结晶,熔点在72.5-72.8℃之间。原药为橙黄色或淡黄色的水溶液,呈弱碱性并带有氨和硫化氢的独特气味。它易溶于水,微溶于乙醇、丙酮,并不溶于苯。该物质在空气中不够稳定,在温度超过40℃时容易分解,遇酸性物质也容易分解。
用途对多种作物真菌性病害有效,可用于种子处理、叶面喷雾及土壤消毒。它能防治水稻白叶枯病、黄瓜霜霉病、白粉病、甘薯黑斑病、棉花炭疽病以及蔬菜和果树的某些病害等。
生产方法在乙二胺与氨水混合液中滴加二硫化碳,于30℃反应并压滤,即可获得代森铵。原料消耗定额为:乙二胺(98%)130kg/t、二硫化碳(98%)340kg/t、氨水(20%)500kg/t。
类别有毒物品
毒性分级高毒
急性毒性口服-大鼠LD₅₀:395毫克/公斤
可燃性危险特性可燃;受热分解可能产生有毒氧化氮、氧化硫气体
储运特性库房需通风低温干燥,并与食品原料分开储存运输
灭火剂砂土、干粉、泡沫
职业标准CL 0.05毫克(钒)/立方米/15分钟
Maneb is a manganese(II)‐containing fungicide with a multi‐site effect and no resistance, therefore it is widely applied in many parts of the world. There is, however, mounting evidence for neurotoxic effects with Parkinson‐like symptoms (manganism) related to usage of Maneb. Due to its insolubility in most solvents and its paramagnetism, structural elucidation is not trivial, and thus its exact molecular structure remains unknown. We report herein a synthesis procedure to prepare Maneb reproducibly in pure form and the use of various analytical techniques including X‐ray diffraction, X‐ray absorption spectroscopy and electron diffraction to determine the molecular structure of Maneb in the solid state and also in solution.