ARS PESTICIDE PROPERTIES last update May 1995


name:PENDIMETHALIN                             CASRN: 40487-42-1

molecular formula: C13H19N3O4
molecular weight : 281.3
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9AMCY1

_________________________________________________________________________
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):
56     -     57                                  M     9AMCY1

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
STABLE                           NR              M     9AMCY1
STABLE*                          NR     5-9      H     9PMED8

Photolysis (per day):

Vapor pressure (mPa):
4                                25              H     9ACHB2 1983 ED.
1.2*                             25              M     9AMCY1
4.9                              35              M     9AMCY1
21.1                             45              M     9AMCY1


Water solubility (ppm):     -temp-           -source- -reference-
0.3                           20                 E     ETOCDK 8:339-357,1989
0.275*                        25                 M     9AMCY1

Organic solubility (ppm):
7.7E04*   PROPAN-2-OL         20                 H     9PMED8
7E05*     ACETONE             20                 H     9PMED8
6.3E05*   XYLENE              20                 H     9PMED8

Henrys law (Pa m3/mol):
1.23*                         25                 M     9AMCY1

Octanol/water partitioning (log Kow):
5.2*                                             E     9AMCY1

Acid dissociation (pKa):


Soil sorption:
soiltype        temp.   Kd      Koc      %om   pH     reference
                                5000                  8GLEAM
SAND             25     30      6.5E+3   0.8   7.6    9AMCY1
SANDY LOAM       25     110     1.2E+4   1.6   6.4    9AMCY1
SILT LOAM        25     380     1.4E+4   4.7   7.0    9AMCY1
LOAM             25     301     1.4E+4   3.8   7.0    9AMCY1
LOAM             25     854     2.9E+4   5.0   6.5    9AMCY1
                                13400*

Field Dissipation halflife(days):
value             test area        pH        source   reference
90-120                                          H     9ACHB2 1983 ED.
8                                               C     8GLEAM
360-480                                         R     8FULLE
82-242            SOIL AZ                       M     9AMCY1
174(8-480)*

Halflife in soil:
Soiltype           aerobic      anaerobic    source   reference
SAND LOAM           1300*         60            M     9AMCY1
                        


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