ARS PESTICIDE PROPERTIES last update May 1995


name:ETHEPHON                                  CASRN: 16672-87-0

molecular formula: C2H6CLO3P
molecular weight : 144.5
physical state   : S
(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):
74     -     75                                  H     9ACHB2,2ND ED.,1987

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
2.77                             25     7        M     9RHPOU
STABLE*                          25     <3

Photolysis (per day):
0.023*               SOIL        25              M     9RHPOU

Vapor pressure (mPa):
<1.0E-2                          20              H     9ACHB2,2ND ED.,1987
<0.013*                          25              M     9RHPOU


Water solubility (ppm):       -temp-          -source-   -reference-
1.24E+06*                       23               M     9RHPOU

Organic solubility (ppm):
1.15E+6*   METHANOL             23               M     9RHPOU
<2.5E+1*   HEXANE               23               M     9RHPOU
2.5E+3 *   DICHLOROMETHANE      23               M     9RHPOU

Henrys law (Pa m3/mol):
<1.5E-09*                       25               M     9RHPOU

Octanol/water partitioning (log Kow):
-.22*                           25               M     9RHPOU

Acid dissociation (pKa):


Soil sorption:
soiltype      temp.   Kd    Koc    %om   pH  source   reference
                             1*                R      CMSHAF 10:833-845,1981

Field Dissipation halflife(days):
value             test area     pH    %OM    source   reference
10-20             BARE                          M     9RHPOU
10-21             SOIL                          M     9RHPOU
10-21             SOIL                          M     9RHPOU
15(10-21)*

Halflife in soil:
Soiltype            aerobic      anaerobic   source   reference
SAND*                    <7         8           M     9RHPOU


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