ARS PESTICIDE PROPERTIES last update May 1995


name:ISAZOFOS                                  CASRN: 42509-80-8

molecular formula: C9H17CLN3O3PS
molecular weight : 313.7
physical state   : L
(L=liquid; G=gas; S=solid)
reference:

_________________________________________________________________________
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):
100    -             0.001mmHg                    H    9ACHB2 7TH ED.,1977

Melting point(deg C):
       -

Decomposition point(deg C):
       -    210

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
0.0060*                          25     5        M     9CIBAG
0.0136*                          25     7        M     9CIBAG
0.0495*                          25     9        M     9CIBAG

Photolysis (per day):
0.173*               SOIL        25     7.5      M     9CIBAG
0.04                 SOIL        25     7.5      M     9CIBAG
0.017*               WATER       25     5        M     9CIBAG

Vapor pressure (mPa):
11.6*                            25              M     9CIBAG
4.3                              20              H     9ACHB2 7TH ED.,1977


Water solubility (ppm):        -temp-        -source-  -reference-
69*                              20              M     9CIBAG
34                                               M     9CIBAG

Organic solubility (ppm):

Henrys law (Pa m3/mol):
0.0527*                          25              M     9CIBAG

Octanol/water partitioning (log Kow):
3.1*

Acid dissociation (pKa):


Soil sorption:
soiltype        temp.   Kd      Koc     %om   pH     reference
CLAY                    3.92    139     4.8   5.9    9CIBAG
SAND                    0.28    52.9    0.9   6.5    9CIBAG
SILT LOAM               2.38    385     1.0   7.5    9CIBAG
SANDY LOAM              0.54    91.3    1.0   8.5    9CIBAG
SANDY LOAM              1.18    105.9   1.9   7.5    9CIBAG
                                155*

Field Dissipation halflife(days):
value           test area        pH        source     reference
5.9               FL                         M        9CIBAG
2.5               NJ                         M        9CIBAG
48.4              NJ                         M        9CIBAG
34                CA                         M        9CIBAG
13                                           M        9CIBAG
4.9                                          M        9CIBAG
18(2.5-48.4)*

Halflife in soil:
Soiltype           aerobic      anaerobic   source    reference
                   40.5*        14           M        9CIBAG


Comments:
PHOTOLYSIS VALUE 0.173 = NAT; VALUE 0.04 = ART
SOIL SORPTION KOC VALUE=155(53-385); AEROBIC=40.5(4-77);
ANAEROBIC=14(8.1-20)