ARS PESTICIDE PROPERTIES last update May 1995


name:DCPA(CHLORTHAL-DIMETHYL)                    CASRN: 1861-32-1

molecular formula: C10H6CL4O4
molecular weight : 331.97
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9MERCK,10TH ED.P.409,1983

_________________________________________________________________________
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):
155    -    156                                  H     9ACHB2,2ND ED., 1987

Decomposition point(deg C):
360    -    370                                  H     9ACHB2,2ND ED.,1987

Heat of vaporization(deg C):
25                               75              E     JCEAAX 26(3):237,1981


--RATE CONSTANTS--

Hydrolysis (per day):
STABLE                                           M     6ISKBI

Photolysis (per day):
STABLE               WATER                       M     6ISKBI
STABLE               SOIL                        M     6ISKBI

Vapor pressure (mPa):
0.33*                            25
3.3E-01                          25              E     JAFCAU, 32(3):640,1984
2.43E+02                         80              E     JCEAAX, 26(3):237,1981
4.13E+02                         85              E     JCEAAX, 26(3):237,1981
6.44E+02                         90              E     JCEAAX, 26(3):237,1981
1.02E+03                         95              E     JCEAAX, 26(3):237,1981
1.70E+03                        100              E     JCEAAX, 26(3):237,1981


Water solubility (ppm):       -temp-        -source-  -reference-
0.5*                            25               E     EESADV
                                                 E     ETOCDK 8:339-357,1989
<5E-01                          25               H     9PMED8,8TH ED.,p.184,1987

Organic solubility (ppm):
1.0E+5*   ACETONE               25               H     9PMED8,8TH ED.,p.184,1987
2.5E+5*   BENZENE               25               H     9PMED8,8TH ED.,p.184,1987
1.2E+5*   DIOXANE               25               H     9PMED8,8TH ED.,p.184,1987
1.7E+5*   TOLUENE               25               H     9PMED8,8TH ED.,p.184,1987
1.4E+5*   XYLENE                25               H     9PMED8,8TH ED.,p.184,1987

Henrys law (Pa m3/mol):
0.219*                          25               M     6ISKBI

Octanol/water partitioning (log Kow):

Acid dissociation (pKa):

Soil sorption:
soiltype      temp.   Kd    Koc    %om   pH  source   reference
                            6456                R     EESADV, 4:32,1980
                            4000                E     JEVQAA 16:422-428,1987
                            6400                R     EESADV
                            5600*

Field Dissipation halflife(days):
value           test area        pH    %OM   source    reference
30                                              H      9ACHB2 1983 ED.
60-100                                          H      9HERBH
100                                             E      JEFQAA 16:422-428,1987
18-37                                           R      8COHEN
>14-21                                          P      8EPAGR
50(14-100)*

Halflife in soil:
Soiltype          aerobic      anaerobic     source    reference
                   18-48         26             M      6ISKBI
Comments:
SOIL SORPTION KOC VALUE 5600(4000-6456)