ARS PESTICIDE PROPERTIES last update May 1995


name:TRIASULFURON                              CASRN: 82097-50-5

molecular formula: C14H16CLN5O5S
molecular weight : 401.83
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9CIBAG

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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):
178.1  -                                         H     9PME10

Decomposition point(deg C):
178.1  -                                         H     9PME10

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
0.023*                           20     5        M     9CIBAG
STABLE*                          20     7-9      M     9CIBAG

Photolysis (per day):
STABLE*              SOIL        23.3            M     9CIBAG
0.0080*              WATER       25     9        M     9CIBAG

Vapor pressure (mPa):
0.002                            25              M     9CIBAG


Water solubility (ppm):        -temp-       -source-  -reference-
32 (pH 5)                        20              M     9CIBAG
815 (pH 7)                       20              M     9CIBAG
13500 (pH 9)                     20              M     9CIBAG


Organic solubility (ppm):
1.4E4     ACETONE                                H     9PME10
3.6E4     DICHLOROMETHANE                        H     9PME10
4.3E3     ETHYL ACETONE                          H     9PME10

Henrys law (Pa m3/mol):
9.9E-07 (pH 7)                   20              M     9CIBAG

Octanol/water partitioning (log Kow):
-0.58 (pH 7)                     25              M     9CIBAG

Acid dissociation (pKa):
4.64*                            20              H     9PME10


Soil sorption:
soiltype      temp.   Kd     Koc    %om   pH  source   reference
SNDY LM(KY)                  73.4                M     9CIBAG
FOUR SOILS                   51.6-190.6          M     9CIBAG
                             105*

Field Dissipation halflife(days):
value           test area     pH    %OM       source   reference
27(10-87)*     FOUR SOILS                        M     9CIBAG
20-25          SL(CA)                            M     9CIBAG

Halflife in soil:
Soiltype            aerobic      anaerobic    source   reference
                     114*        198*            M     9CIBAG
SNDY LM(KY)          161         112             M     9CIBAG


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