Abstract
In this paper the best available inorganic insecticides were chosen as emulsifying agents. While preparing the emulsions it was kept in mind to take minimum of the substance as an economical measure. The ratio of water to oil was so kept, as to have the most stable and mobile emulsion, in order that it could be easily-used for practical purposes. It was found that the percentage of 0.5 and 0.25 of the emulsifying agent with a ratio of oil to water as 20∶80, best stable emulsions are produced. The substances taken were copper arsenate and arsenite, lead, calcium and aluminium arsenates. With the addition of natural colloids, the stability is increased to a great extent. The natural colloids easily formed a highly solvated membrane which envelops the oil globules, thereby making the emulsions very stable. The addition of soaps deteriorates or breaks the emulsions in all cases, but with aluminium arsenate. The addition of soaps instead of having an antagonistic effect, re-inforces aluminium arsenates. The aluminium arsenate is hydrolysed producing aluminium hydroxide. It has already been seen by previous workers that aluminium hydroxide and sodium or potassium oleate act as very good emulsifying agents.
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