ARS PESTICIDE PROPERTIES last update May 1995


name:PHOSMET                                   CASRN: 732-11-6

molecular formula: C11H12NO4PS2
molecular weight : 317.33
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9ACHB2

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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):
       -

Melting point(deg C):
70     -   72.7                                  H     9ACHB2

Decomposition point(deg C):
       -    100                                  H     9ACHB2

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
0.092                            25     5        M     8ICIAG
1.77                             25     7        M     8ICIAG
181                              25     9        M     8ICIAG
0.053*                           20     4.5      H     9PMED8
4.16*                            20     8.3      H     9PMED8
1.39*                            20     7        H     9PMED8

Photolysis (per day):
0.361*               SOIL        25     5.0      M     8ICIAG,03/01/90

Vapor pressure (mPa):
6.52E-2                          25              M     8ICIAG 
0.06                             20              R     9HRLCP
0.005                            25              M     8ICIAG
0.065*                           25


Water solubility (ppm):     -temp-          -source-   -reference-
25                            25                 H     9ACHB2 1983 ED.
                                                 E     ESTHAG 11:475-478,1977
20*                           25                 M     8ICIAG

Organic solubility (ppm):
6.5E+5*   ACETONE             25                 H     9PMED8
6E+5*     BENZENE             25                 H     9PMED8
5E+4*     METHANOL            25                 H     9PMED8
3E+5*     TOLUENE             25                 H     9PMED8
2.5E+5*   XYLENE              25                 H     9PMED8
5E+3*     KEROSENE            25                 H     9PMED8

Henrys law (Pa m3/mol):
0.00103*                      25                 H     8ICIAG

Octanol/water partitioning (log Kow):
3.0*                          25                 M     8ICIAG 03/01/90

Acid dissociation (pKa):


Soil sorption:
soiltype        temp.   Kd       Koc     %om   pH     reference
                                 740                  EESADV
                                 500                  8GLEAM
                                 612                  8ICIAG
                                 820                  8ICIAG
                                 668*

Field Dissipation halflife(days):
value           test area        pH        source     reference
20                                            C       8GLEAM
4                                             R       8FULLE
19                                            M       8ICIAG
14(4-20)*

Halflife in soil:
Soiltype               aerobic      anaerobic   source    reference

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