ARS PESTICIDE PROPERTIES last update May 1995


name:DIAZINON                                  CASRN: 333-41-5

molecular formula: C12H21N2O3PS
molecular weight : 304.35
physical state   : L
(L=liquid; G=gas; S=solid)
reference: 9ACHB2,2ND ED.,1987

_________________________________________________________________________
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):
83     -     84   .0002 mmHg                     H     9ACHB2,2ND ED.,1987

Melting point(deg C):
       -

Decomposition point(deg C):
       -    120                                  H     9ACHB2,2ND ED.,1987

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
0.0578*                          25     5        M     9CIBAG
0.0050*                          25     7        M     9CIBAG
0.009*                           25     9        M     9CIBAG

Photolysis (per day):
0.151*               SOIL**      25              M     9CIBAG
0.136*               WATER***    25     7        M     9CIBAG

Vapor pressure (mPa):
.64E+1                           20              R    9HRLCP(KIM, ET AL),1984
.975E+1                          20              R    9HRLCP(MARTI),1976
.187E+2                          20              H    9MERCK,10TH ED.,p.434,1983
14.1*                            22              M    9CIBAG

Water solubility (ppm):     -temp-         -source-  -reference-
40                            30               E      JAFCAU 18:814-818,1970
68.8                          22               E      JPFCD2,VB14(6):627,1979
40                            20               H      9ACHB2,2ND ED.,1987
60*                           22               E      9CIBAG

Organic solubility (ppm):
MISCIBLE* ACETONE,BENZENE     20               H      9PMED8
MISCIBLE* CYCLOHEXANE,ETHER   20               H      9PMED8
MISCIBLE* DICHLOROMETHANE     20               H      9PMED8
MISCIBLE* ETHANOL,OCTAN-1OL   20               H      9PMED8
MISCIBLE* TOLUENE             20               H      9PMED8

Henrys law (Pa m3/mol):
0.072*                        25               M    9CIBAG

Octanol/water partitioning (log Kow):
3.02                                           R   9HRLCP(RAO&DAVIDSON),1980
3.81                                           R   9HRLCP(BOWMAN&SANS),1983
3.11                                           R   9HRLCP(BRIGGS),1981
3.30*                         25               U   9CIBAG
3.14                          20               E   JARJA9, 17(3):176,1983

Acid dissociation (pKa):


Soil sorption:
soiltype        temp.   Kd      Koc      %om   pH     reference
SANDY LOAM              017.9   1539     2.0   5.4    9CIBAG
SILT LOAM               08.2    1007     1.4   7.0    9CIBAG
SILT LOAM               017.3   1653     1.8   6.5    9CIBAG
SAND                    015.0   1842     1.4   7.0    9CIBAG
                                1520*

Field Dissipation halflife(days):
value           test area        pH        source     reference
32                                            R       SCSFAD 44:1-8,1985
7               SNDY LM(CA)                   M       9CIBAG
35                                            E       PSSCBG 19:101-112,198
32-48                                         R       9EINSP PP.23-67
54                                            R       8INSFO
7(2.8-13)*                                    M       9CIBAG

Halflife in soil:
Soiltype           aerobic      anaerobic   source    reference
SANDY LOAM           39*           17*        M       9CIBAG


Comments:
PHOTOLYSIS ** NATURAL LIGHT