ARS PESTICIDE PROPERTIES last update May 1995


name:DIQUAT DIBROMIDE                          CASRN: 85-00-7

molecular formula: C12H12BR2N2
molecular weight : 344.06
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):
300    -                                         H     9ACHB2

Decomposition point(deg C):
300    -                                         H     9PMED8

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
STABLE*                          25     5,7      M     8ICIAG
V.SLOW*                          25     9        M     8ICIAG

Photolysis (per day):

Vapor pressure (mPa):
NONVOLAT*                        NR              H     9HERBH
                                 NR              H     9ACHB2

Water solubility (ppm):        -temp-        -source- -reference-
6.77E05                                          M     8VALUS
7.18E05*                         20              M     8ICIAG

Organic solubility (ppm):

Henrys law (Pa m3/mol):

Octanol/water partitioning (log Kow):
-4.6*                         20                 M    8ICIAG 03/01/90

Acid dissociation (pKa):


Soil sorption:
soiltype        temp.   Kd       Koc      %om   pH    reference
                                 >10000               8VALUS
                                 205-691              8QSARP
                                 500*

Field Dissipation halflife(days):
value           test area        pH        source     reference


Halflife in soil:
Soiltype           aerobic      anaerobic   source    reference
                   >1000                       M      8VALUS

Comments:
SOIL SORPTION KOC=500(205-1000); WATER SOLUBILITY 7.18E05 AT pH7.2.