ARS PESTICIDE PROPERTIES DATABASE last updated Oct 1, 2001


name: 2,4-DB BUTOXYETHYL ESTER                  CASRN: 32357-46-3


SELECTED VALUES FOR MODELING PURPOSES (from Hornsby, et al., 1996)

WATER SOLUBILITY (mg/L): 8
FIELD HALF-LIFE (days): 7 {1}
SOIL ORGANIC CARBON SORPTION (Koc, mL/g): 500
VAPOR PRESSURE (mm Hg): <1 x 10-7
pKa:  4.8 {1,2}


PUBLISHED AND MANUFACTURER VALUES AND SOURCES

molecular formula: C16H22O4CL2
molecular weight : 349.26
physical state   : L
(L=liquid; G=gas; S=solid)
reference: 9RHPOU

_________________________________________________________________________
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):
       -

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):

Photolysis (per day):
0.02*                SOIL        25              M     9RHPOU
0.04                 WATER       25     7        M     9RHPOU

Vapor pressure (mPa):
1.3E-02*                         25              M     9RHPOU


Water solubility (ppm):       -temp-        -source-   -reference-
8*                               25              M     9RHPOU

Organic solubility (ppm):
>1.0E+6*  ACETONE                25              M     9RHPOU
>1.0E+6*  HEXANE                 25              M     9RHPOU
>1.0E+6*  ISOPROPANOL            25              M     9RHPOU

Henrys law (Pa m3/mol):
5.6E-04*                         25              M     9RHPOU

Octanol/water partitioning (log Kow):
5.00*                            25              M     9RHPOU

Acid dissociation (pKa):
4.8**                                            H     9PMED8

Soil sorption:
soiltype        temp.   Kd       Koc      %om   pH     reference
SANDY CLY LOAM          1.47     195      1.3   6.6    9RHPOU
SAND                    0.795    457      0.3   5.4    9RHPOU
SILT LOAM               0.461    38       2.1   7.0    9RHPOU
SILT LOAM               3.27     113      5.0   7.0    9RHPOU
                                 201*

Field Dissipation halflife(days):
value          test area         pH          source    reference
7(4.7-10)*
10            89 CA WHEAT                       M      9RHPOU
4.7           88 NC WHEAT                       M      9RHPOU

Halflife in soil:
Soiltype            aerobic      anaerobic   source    reference

Comments:
ESTER RAPIDLY CONVERTED TO PARENT. pKa VALUE FOR PARENT ACID.