Nabam 
Above aqueous Nabam solutions or treated soil, in addition to H9S, CS? 
and ethylenediamine, carbonyl sulfide was also observed and identified by 
means of gas chromatography and infra-red (1023, 1053). In the presence of 
an acid buffer, H9S and CS» were evolved. In distilled water, nabam under- 
went hydrolysis with evolution of carbon disulfide. The latter underwent 
oxidation to sulfate. No hydrogen sulfide was evolved (897). Traces of 
Manganese catalyzed the oxidation of nabam to ethylenethiuram monosulfide 
(905) 
Maneb 
Aqueous suspensions of maneb decomposed rapidly. At ordinary tempera- 
tures, 10% of the maneb decomposed in one hour; at 40°C, decomposition was 
almost complete in 3 hours. In the absence of oxygen, C55, H25, and ethylene~ 
thiourea formed. In the presence of oxygen, carbon disulfide (but not 
hydrogen sulfide) was liberated. A portion of maneb was insoluble in water. 
This was partly soluble in CHCl3. Paper chromatography indicated four com- 
pounds, one of which was identified by infrared as ethylenethiourea. Two 
other compounds were tentatively identified as ethylenethiuram mono- and di- 
sulfides (408, 1447). Sulfate was also characterized. 
When stored in the dark maneb underwent decomposition to ethylene- 
thiourea, ethylenethiuram mono- and di-sulfide, ethylenediamine, sulfur 
and several unidentified compounds (326). 
189 
