ARS PESTICIDE PROPERTIES DATABASE last updated May 1995

name: DEMETON                        CASRN: 8065-48-3    
                                             298-03-3(Demeton-O)
molecular formula: C8H19O3PS2                126-75-0(Demeton-S)
molecular weight: 258.3                       
physical state: L                     
(L=liquid; G=gas; S=solid)
reference: 9PMED9

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Key to sources: (M)Manufacturer, (R)eview, (H)andbook,(E)xperiment,
                (C)alculated, (U)nknown, (P)EPA data, (W)auchope

* denotes a selected value where multiple values of a property are listed.
__________________________________________________________________________

value              medium     temp.    pH  source   reference
-----              ------     -----    --  ------   ---------

Boiling point (deg C):
123("O"), 128("S") BOTH AT 1 MM HG           H      9PMED9

Melting point (deg C):

Decomposition point (deg C):

Heat of vaporization (deg C):

--RATE CONSTANTS--

Hydrolysis (per day):

Photolysis (per day):

Vapor pressure (mPa):
38("O")                         20           H      9PMED9
35("S")                         20           H      9PMED9

Water solubility (ppm): 
2000("O")                       22           R      RREVAH 103: 1-59 (1988)
60("S")                         22           R      RREVAH 103: 1-59 (1988)

Organic solubility (ppm):
SOLUBLE IN MOST ORGANIC SOLVS.               H      9PMED9

Henrys law (Pa m3/mol):
4.9E-3("O"),0.15("S")           20           H      9PMED9
 
Octanol/water partitioning (log Kow):

Acid dissociation (pKa):
                                                          

Soil sorption:
soiltype         temp.    Kd     Koc      %om   pH   reference
--------         -----    --     ---      ---   --   ---------
                                 70("S")             W
                                 387("O")            W
                                                     
Field dissipation halflife(days):
value              test area          pH    source  reference
-----              ---------          --    ------  ---------
8-23("O")                                    C      ADCSAJ 111: 55-120 (1972)

Halflife in soil:
soiltype           aerobic  anaerobic       source  reference
--------           -------  ---------       ------  ---------

Comments:
MIXTURE OF TWO ISOMERS: DEMOTON S AND DEMETON O.