ARS PESTICIDE PROPERTIES last update May 1995


name:ISOFENPHOS                                CASRN: 25311-71-1

molecular formula: C15H24NO4
molecular weight : 345.4
physical state   : L
(L=liquid; G=gas; S=solid)
reference: 9MILES

_________________________________________________________________________
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):
-12    -                                         H     9ACHB2,2ND ED., 1987

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
<0.023*                          25     5,7,9    M     6MILES

Photolysis (per day):
0.0096*              SOIL        12-27 OD        M     6MILES
0.0007*              WATER       25              M     6MILES

Vapor pressure (mPa):
0.293*                           25              M     6MILES
0.53                             20              H     9PMED8,8TH ED.,p.486,1987
0.4                              20              H     9ACHB2 1983 ED.


Water solubility (ppm):       -temp-         -source-  -reference-
22.1                             20              E     JPFCD2,VB18(2):225,1983
18*                              20              M     6MILES
24                               20              H     9PMED8,8TH ED.,p.486,1987
23.8                             20              H     9ACHB2
20                                               H     9FACHB 1990

Organic solubility (ppm):
>2.0+5*   2-PROPANOL             20              M     6MILES
>2.0+5*   DICHLOROMETHANE        20              M     6MILES
>2.0E+5*  TOLUENE                20              M     6MILES
>6.0E+5*  CYCLOHEXANONE          20              H     9PMED8,8TH ED.,p.486,1987

Henrys law (Pa m3/mol):
4.2E-03*                         20              M     6MILES

Octanol/water partitioning (log Kow):
3.30*                            20              M     6MILES

Acid dissociation (pKa):


Soil sorption:
soiltype      temp.   Kd     Koc    %om   pH  source   reference
                             17                  R     EESADV
SILT LOAM             5.6    535    1.8   2.6    M     6MILES
SANDY LOAM            10.3   611    2.9   2.5    M     6MILES
SAND           25     7.76   1474** 1.0   4.3    M     6MILES
SANDY LOAM     25     5.81   1004** 1.1   6.6    M     6MILES
SILT LOAM      25     10.1   663**  2.9   5.9    M     6MILES
CLAY LOAM      25     8.64   746**  2.2   6.4    M     6MILES
                             777*

Field Dissipation halflife(days):
value         test area         pH    %OM     source   reference
69                                               P     8EPAGR
127                                              P     8EPAGR
30->270                                          P     8EPAGR
>90                                              P     8EPAGR
>365                                             P     8EPAGR
45-200                                           P     8EPAHO
100-200                                          R     8FULLE
67           TX SANDY LOAM      7.0              M     6MILES
100          AZ SANDY LOAM      6.6              M     6MILES
31           KS, SILT LOAM      6.2              M     6MILES
32           KS, SLTY CLY LOAM  6.1              M     6MILES
22           MN, SANDY LOAM     7.0              M     6MILES
12           GA, LOAMY SAND     6.0              M     6MILES
103(12-365)*

Halflife in soil:
Soiltype            aerobic      anaerobic     source  reference
SILT LOAM            59                          M     6MILES
SANDY LOAM           127                         M     6MILES
                     93*


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 KOC 777(535-147).