APPENDIX 1 
PHYSICAL CONSTANTS OF SOME ORGANOPHOSPHATE COMPOUNDS* 
Kt = In _£0 Where C, = Initial concentration and 
C C = Concentration at time "t". 
This then reduces to the following for the half-life: 
=> 1 
txo res In 2 
=) 0.693 
oe aaa ame 
Because of the low solubility of preparations of the "E-605" 
group, the experiments in these cases were conducted in 20% aqueous 
methanol at 70°C. At 40°C some of the substances give precipitates, 
so that the measurements were uncertain. 
COMPOUND Half-Life 70° [ HRS. ] 
E-605 (IV) 64 
Methyl-E-605 (XVIIT) 13° 
ITsochlorthion (XxX) 9 
Chlorthion (XIX) 7.3 
PREP. S 133 (XXTI) 5.5 
*Muhlman and Schrader, 1957. 
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