ARS PESTICIDE PROPERTIES last update May 1995


name:DIURON                                    CASRN: 330-54-1

molecular formula: C9H10CL2N2O
molecular weight : 233.1
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9ACHB2

_________________________________________________________________________
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):
158    -    159                                  H        9ACHB2

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
<0.0014*                       25     5,7,9      M        9DUPON

Photolysis (per day):
0.004* (1.4%OM)      SOIL      25     6.4        M        9DUPON
0.016*               WATER     25     7          M        9DUPON

Vapor pressure (mPa):
9.2E-3*                        25                M        9DUPON


Water solubility (ppm):       -temp-         -source-    -reference-
42*                            25                M        9DUPON

Organic solubility (ppm):

Henrys law (Pa m3/mol):
5.1E-5*                        25                M        9DUPON

Octanol/water partitioning (log Kow):
2.8*                           25                M        9DUPON

Acid dissociation (pKa):



Soil sorption:
soiltype     temp.   Kd     Koc     %om    pH   source   reference
                            477*
SANDY LOAM    25     2.9    453     1.1    6.6   M       9DUPON
SANDY LOAM    25     5.1    418     2.1    6.5   M       9DUPON
SILT LOAM     25     14.0   560     4.3    5.4   M       9DUPON
SILT LOAM     25     13.0   476     4.7    4.3   M       9DUPON


Field Dissipation halflife(days):
value        test area        pH                source   reference
90           MADERA(CA)                          M       9DUPON

Halflife in soil:
Soiltype           aerobic      anaerobic       source   reference
SILT LOAM(DE)       372*                         M       9DUPON


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