Content Handbook E

Outline of method

Maneb, dissolved in tetrasodium EDTA solution, is decomposed by boiling sulphuric acid to ethylenediamine sulphate and carbon disulphide. The latter is passed through a cadmium sulphate scrubber to remove any hydrogen disulphide, and then into an absorption train containing methanolic potassium hydroxide to afford potassium methyl xanthate which, after neutralization with dilute acetic acid, is titrated with standard iodine.

Scope

The method is usable for WP, WG, SC and DP formulations.