Abstract
Commercial magnesium arsenate insecticides are prepared by treating magnesium hydroxide suspended in water, or a solution of a magnesium salt, with arsenic acid or an alkali arsenate. The di or trimagnesium arsenate is formed, depending upon the proportion present of the reacting compounds. The reaction products are then heated in an autoclave to a temperature of 165-175° under pressure for several hours in order to reduce the water soluble arsenic content to a low value. The product is then filtered, dried and ground to a fine powder. There are two grades of this product on the market, and a typical chemical and physical analysis of each is given. They both contain a crystalline material of which certain of the optical properties agree with those of the basic arsenate Mg3(As04) 2.MgO.YH2O mentioned in the patents. A short review of the published entomological tests with this material is included.
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