ARS PESTICIDE PROPERTIES last update May 1995


name:CAPTAN                                    CASRN: 133-06-2

molecular formula: C9H8CL3NO2S
molecular weight : 300.61
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):
178    -                                         H      9PME10

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
1.39*                            25     5        M     8ICIAG
3.54*                            25     7        M     8ICIAG
124*                             25     9        M     8ICIAG

Photolysis (per day):
stable*                          NR              M     8ICIAG

Vapor pressure (mPa):
0.012*                           25
1.1E-02                          25              M     8ICIAG
<1.3E-02                         25              H     9ACHB2 1983 ED.
1.1                              20              R     9HRLCP


Water solubility (ppm):       -temp-          -source-       -reference-
5.1*
RT<0.5                                           C     EESADV
                                                 M     8ICIAG
RT<5                                             H     9FACHB 1990
3.3                                              H     9ACHB2 1983 ED.
5.1                                              M     8ICIAG

Organic solubility (ppm):
2.1E04*   ACETONE             25                 H     9PMED8
7E04*     CHLOROFORM          25                 H     9PMED8
2.3E04*   CYCLOHEXANE         25                 H     9PMED8
1.7E03*   PROPAN-2-OL         25                 H     9PMED8
2E04*     XYLENE              25                 H     9PMED8

Henrys law (Pa m3/mol):
6.5E-4*                                          M     8ICIAG

Octanol/water partitioning (log Kow):
2.8*                             25              M     8ICIAG  03/01/90

Acid dissociation (pKa):


Soil sorption:
soiltype      temp.   Kd     Koc     %om   pH  source  reference
                             33                  E     JEVQAA 16:422-428,1987
                                                 E     SCSFAD 44:1-8,1985
                             67                  E     JAFCAU 29:1050-1059,1981
                             198                 C     8GLEAM
                             140                 C     8CREAM
                             115                 E     JPFCD2 22:55-69,1987
                             100-600             M     8ICIA
                             151*

Field Dissipation halflife(days):
value             test area        pH         source   reference
5(2.5-10)*
2.5                                             M      8ICIAG 03/01/90
3                                               E      SCSFAD 44:1-8,1985
                                                E      JEVQAA 16:422-428,1987
10                                              C      8GLEAM
2.5                                             M      8ICIAG

Halflife in soil:
Soiltype              aerobic      anaerobic   source   reference

Comments:
SELECTED SOIL SORPTION KOC VALUE 151(33-600)