
Storage stability studies of di-syston on fertilizers indicated good 
stability at room temperature for periods up to one year with recoveries 
of 70-90%. Exceptions to this were observed with ammonium nitrate and 
superphosphate; only traces of di-syston were detected. The main 
oxidation products were the oxygen analogs of the sulfoxide and sulfone 
(705). 
Thin films of di-syston were irradiated with U.V. light with a wave- 
length maximum of 2540A. Three compounds were observed. It was believed 
that disulfoton sulfone and sulfoxide were present. The third compound 
was not characterized but may have been an oxygen analog (1608). 
Kinetic studies have shown that temperature, by its general effect 
on chemical kinetics and by governing the rate of physiological activities 
of the plant, plays a large but somewhat predictable role in the metabo- 
lism of systemic insecticides in plants. Figures showed that for every 
rise of 10°C, the rate of disappearance of di-syston sulfoxide increased 
by about 1.86 times. Similar effects are presumed for the reactions 
giving rise to the other identified metabolites (1002). 
Oxidation of di-syston by aqueous bromine, ascorbic acid - Fett, 
or horseradish peroxidase gave (C2H30).P(0)SCH»CH»SCoHs, the sulfoxide 
and the sulfone in all cases (1107). 
182 
