THE DECOMPOSITION OF DITHIOCARBAMATE FUNGICIDES, WITH SPECIAL REFERENCE TO THE VOLATILE PRODUCTS

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Abstract
The gaseous exchange accompanying decomposition of dithiocarabamate fungicides was measured in the Warburg manometer. Sodium diethyl dithiocarbamate decomposed under slightly acid conditions, producing CS2 and a salt of diethylamine. The insoluble Zn and Fe salts of dimethyl dithiocarbamic acid also decomposed in a similar fashion, but no CS2 was given off from the more stable Cu salt of this compound. The rate of decomposition of these metallic salts fell in the following decreasing order: Na+> Zn++ > Fe+++ > Cu++ Disodium ethylene bis-dithiocarbamate (nabam) decomposed under slightly acid conditions to produce approx. equal vols. of H2S and CS2, and presumably left a residue of ethylene thiourea. In distilled water, nabam underwent a slow basic hydrolysis and oxidation, with absorption of approx. 2 vols. of O2, and evolution of 1 vol. of CS2. Apparently the S fraction which is evolved as H2S from nabam under acid conditions is, under basic conditions, oxidized in soln. by atmospheric O to SO4.

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