ARS PESTICIDE PROPERTIES last update May 1995


name:DIFENZOQUAT ME-SULFATE SALT               CASRN: 43222-48-6

molecular formula: C18H20N2O4S
molecular weight : 360.4
physical state   : S
(L=liquid; G=gas; S=solid)
reference:9AMCY1

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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):
146    -    148                                  M     9AMCY1

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
STABLE                        25     5,7,9      M      9AMCY1

Photolysis (per day):

Vapor pressure (mPa):
<0.013                        35                       9AMCY1


Water solubility (ppm):     -temp-           -source- -reference-
765000                        25                 H     9ACHB2 1983 ED.
760000                        25                 H     9FACHB
780000                        37                 H     9FACHB
850000                        56                 H     9FACHB
762000                        23                 H     9HERBH
817000*                       25                 M     9AMCY1

Organic solubility (ppm):
588000*   METHANOL                               H     9PMED8
71200*    METHYLENE CHLORIDE                     H     9PMED8
9750*     ACETONE                                H     9PMED8
INSOL.*   XYLENE,HEXANE                          H     9PMED8
23000*    PROPAN-2-OL

Henrys law (Pa m3/mol):
<5.7E-11                                         M     9AMCY1

Octanol/water partitioning (log Kow):
4.45*   ph 5     temp=25                         M     9AMCY1
1.20*      6                                     M     9AMCY1
0.238*     7                                     M     9AMCY1
0.374*     8                                     M     9AMCY1
0.479*     9                                     M     9AMCY1

Acid dissociation (pKa):


Soil sorption:
soiltype          temp.   Kd      Koc      %om   pH     reference
SILT LOAM           25    1093    6.29E+5  3.0   5.2    9AMCY1
SANDY CLY LOAM      25    636     3.53E+4  3.1   6.4    9AMCY1
CLAY LOAM           25    2680    9.24E+4  5.0   7.7    9AMCY1
SANDY LOAM          25    181     3.12E+4  1.0   6.9    9AMCY1
                                  5.5E+4*

Field Dissipation halflife(days):
value            test area        pH         source     reference
90                                              H       9ACHB2 1983 ED.
120                                             H       9HERBH
10-89             SOIL AZ                       M       9AMCY1
87(10-120)*

Halflife in soil:
Soiltype            aerobic      anaerobic   source     reference
                     N.D.         N.D.          M       9AMCY1


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