Sulfur 
The basis of toxic action of sulfur is not clear. It is reduced to 
H»S by fungal spores but this does not account for its toxicity (Miller 
et al., 1953). It has been suggested that sulfur acts as a hydrogen ac- 
ceptor in metabolic systems, thereby disrupting normal hydrogenation 
and dehydrogenation reactions. It has also been suggested that poly- 
sulfide free radicals may form cross linkages with protein and other 
cellular components. Studies have also shown that sulfur blocks enzymes 
in the pathway between acetate and citrate and partially in the succin- 
oxidase system (Owens, 1960; Sisler, 1963). 
Sulfuryl Fluoride (SO,F,) 
Under conditions of usage as a grain fumigant, sulfuryl fluoride 
reacted with protein and released inorganic fluoride. Some sulfate was 
also found (Meikle, 1964). 
RNH9 J 
S0,F, ——_——>BH-80,F + F 
S0,=,F- RNH-SO. oo RNH-SO,-NH-R 
+ + 
F™ FO 
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