ARS PESTICIDE PROPERTIES last update May 1995


name:METHIOCARB                                CASRN: 2032-65-7

molecular formula: C11H15NO2S
molecular weight : 225.31
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 6MILES

_________________________________________________________________________
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):
119    -                                         H     9ACHB2,2ND ED.,1987

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
0.0009*                          25     5        M     6MILES
0.025*                           25     7        M     6MILES
2.31*                            25     9        M     6MILES
0.311*                           25              M     6MILES

Photolysis (per day):
0.025*               SOIL        9-42 OD         M     6MILES
0.008*               WATER       10-37 OD        M     6MILES

Vapor pressure (mPa):
2.8E-02                          20              M     6MILES
1.5E+01                          60              H     9ACHB2,2ND ED.,1987
0.028*                           20


Water solubility (ppm):       -temp-         -source-  -reference-
24*                              20              M     6MILES
30                               20              H     9ACHB2,2ND ED.,1987
10                               20              H     9FACHB, p.145,1988

Organic solubility (ppm):
8.0E+04*  2-PROPANOL             20              M     6MILES
5E+5*     DICHLOROMETHANE        20              M     6MILES
7.0E+04*  TOLUENE                20              M     6MILES

Henrys law (Pa m3/mol):
2.6E-04*                         20              M     6MILES

Octanol/water partitioning (log Kow):
2.97                             20              M     6MILES
3.34*                            20              M     6MILES

Acid dissociation (pKa):


Soil sorption:
soiltype      temp.   Kd    Koc    %om   pH   source  reference
                            209                  C    8SWAMD
                            670                  E    CMSHAF 10:833-845,1981
SAND           27     5.3   1000** 1.0   4.3     M    6MILES
SANDY LOAM     27     4.3   632**  1.3   4.9     M    6MILES
SILT LOAM      27     9.0   600**  2.9   5.9     M    6MILES
CLAY LOAM      27     4.9   408**  2.2   6.3     M    6MILES
                            585*

Field Dissipation halflife(days):
value           test area        pH     %OM   source  reference
19              OR, SAND                        M     6MILES
4               OR, SANDY LOAM                  M     6MILES
12*

Halflife in soil:
Soiltype           aerobic      anaerobic     source  reference
SANDY LOAM           17.7       64.4*           M     6MILES
SANDY LOAM           111
                     64*

Comments:
SOIL SORPTION KOC VALUES WITH A DOUBLE ASTERISK WERE CALCULATED
USING A CONVERSION FACTOR OF 1.9(%OM=1.9%OC) RATHER THAN 1.72.
SELECTED SOIL SORPTION KOC VALUE=510(209-1000);