ARS PESTICIDE PROPERTIES last update May 1995


name:THIDIAZURON                               CASRN: 51707-55-2

molecular formula: C9H8N4OS
molecular weight : 220.2
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):
213    -                                         H     9ACHB2

Decomposition point(deg C):
       -

Heat of vaporization(deg C):


--RATE CONSTANTS--

Hydrolysis (per day):

Photolysis (per day):

Vapor pressure (mPa):
3E-06*                           25              H     9ACHB2


Water solubility (ppm):        -temp-       -source-   -reference-
20*                              23              H     9ACHB2 7TH ED.,1977

Organic solubility (ppm):
8E+3*      ACETONE               23              H     9PMED8
2.1E+4*    CYCLOHEXANONE         23              H     9PMED8
>5E+5*     DIME-FORMAMIDE        23              H     9PMED8
>5E+5*     DIME-SULFOXIDE        23              H     9PMED8
800*       ETHYL ACETATE         23              H     9PMED8
4.5E+3*    METHANOL              23              H     9PMED8

Henrys law (Pa m3/mol):
3.3E-8*                          25              H     9ACHB2

Octanol/water partitioning (log Kow):

Acid dissociation (pKa):


Soil sorption:
soiltype      temp.   Kd    Koc    %om   pH  source   reference
SAND                        908                  M    6NORAM
LOAMY SAND                  786                  M    6NORAM
SANDY LOAM                  780                  M    6NORAM
SANDY CLAY LOAM             494                  M    6NORAM
                            742*


Field Dissipation halflife(days):
value           test area        pH          source   reference
45-60                                           M     6NORAM

Halflife in soil:
Soiltype           aerobic      anaerobic    source   reference
SANDY LOAM          26                          M     6NORAM
CLAY LOAM           144           <30           M     6NORAM

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