ARS PESTICIDE PROPERTIES last update May 1995


name:DICLOFOP-ME                               CASRN: 51338-27-3

molecular formula: C16H14CL2O4
molecular weight : 341.2
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9ACHB2

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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):
39     -     41                                  H     9ACHB2

Decomposition point(deg C):
       -   > 400                                 M     8HOECH 

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
1.91E-3                          25     5        M     8HOECH
2.19E-2                          25     7        M     8HOECH
1.33                             25     9        M     8HOECH
         
Photolysis (per day):
6.93E-3              SOIL                        M     8HOECH
3.15E-2              WATER                       M     8HOECH

Vapor pressure (mPa):
0.25*                            20              M     8HOECH
7.7                              50              M     8HOECH
.03                              20              H     9HERBH
0.16                             30              H     9HERBH
0.466                            25              M     8HOECH

Water solubility (ppm):       -temp-        -source-   -reference-
3                                22              H     9ACHB2 1983 ED.
0.8* (pH7)                       25              M     8HOECH

Organic solubility (ppm):
2.5E+6*   ACETONE                20              H     9PMED8
2.3E+6*   DIETHYL ETHER          20              H     9PMED8
1.1E+5*   ETHANOL                20              H     9PMED8
6.E+4*    LT. PETROLEUM          20              H     9PMED8
2.5E+7*   XYLENE                 20              H     9PMED8

Henrys law (Pa m3/mol):
0.196 *                          25              M     8HOECH

Octanol/water partitioning (log Kow):
4.5775                                           M     8HOECH

Acid dissociation (pKa):
3.43*                                            M     8HOECH


Soil sorption:
soiltype      temp.   Kd    Koc     %om    pH  source  reference
                            4.85E4               R     8EETNS
                            1.6E4*               M     8HOECH
SILT LOAM                   14000                M     8HOECH
SAND                        14906                M     8HOECH
SILT LOAM                   20558                M     8HOECH
HEAVY CLAY                  12722                M     8HOECH

Field Dissipation halflife(days):
value          test area        pH   %OM       source  reference
2                                                M     8HOECH
37                                               M     8HOECH
20(2-37)*

Halflife in soil:
Soiltype          aerobic      anaerobic       source  reference
VARIOUS           23(10-32)*     0.5             M     8HOECH

      
Comments:
ACID DISSOCIATION VALUE 3.1=PARENT