ARS PESTICIDE PROPERTIES DATABASE last updated Jan, 2002


name: BENOMYL                                    CASRN: 17804-35-2


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

WATER SOLUBILITY (mg/L): 2.0
FIELD HALF-LIFE (days): 67
SOIL ORGANIC CARBON SORPTION (Koc, mL/g): 1900
VAPOR PRESSURE (mm Hg): <1 x 10-10


PUBLISHED AND MANUFACTURER VALUES AND SOURCES

molecular formula: C14H18N4O3
molecular weight : 290.3
physical state   : S
(L=liquid; G=gas; S=solid)
reference: 9ACHB2

_________________________________________________________________________
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):
140    -                                          M    9DUPON,1999

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
4.75*                            25     5         M    9DUPON
11.09*                           25     7         M    9DUPON
>16.63*                          25     9         M    9DUPON

Photolysis (per day):
0.23*                SOIL        25     4.3       M    9DUPON
0.17*                WATER       25     5         M    9DUPON

Vapor pressure (mPa):
<5E-3*                           25               M    9DUPON



Water solubility (ppm):       -temp-   -pH-   -source- -reference-
2.9*                             25             
3.6                              25     5        E     JAFCAU 33:63,1985
2.9                              25     7        E     JAFCAU 33:63,1985
1.9                              25     9        E     JAFCAU 33:63,1985


Organic solubility (ppm):

Henrys law (Pa m3/mol):
4.0E-4                           25     5        M     9DUPON
4.9E-4                           25     7        M     9DUPON
7.5E-4                           25     9        M     9DUPON


Octanol/water partitioning (log Kow):
1.37                             25     5        M     9DUPON,1999   

Acid dissociation (pKa):
4.48*                                            M     9DUPON 


Soil sorption:
soiltype     temp.   Kd     Koc      %om   pH   source  reference
SANDY LOAM           6.1    954      1.1   6.6   M      9DUPON
SANDY LOAM           13     1065     2.1   6.5   M      9DUPON
SILT LOAM            90     3600     4.3   5.4   M      9DUPON
                            2100                 E      SCSFAD 44:1-8,1985
SILT LOAM            50     1830     4.7   5.2   M      9DUPON
                            1910*


Field Dissipation halflife(days):
value             test area        pH        source     reference

51                FL SAND/TURF                  M       9DUPON
83                CA LOAM/TURF                  M       9DUPON
80                MS SL/TURF                    M       9DUPON
88                DE SCL/TURF                   M       9DUPON


Halflife in soil:
Soiltype               aerobic    anaerobic   source    reference
                         0.79                   M       9DUPON,1999



Comments:
BENOMYL RAPIDLY CONVERTS TO MBC(CARBENDAZIM:METHYL2 BENZIMA-
ZOLE CARBAMATE). SOIL SORPTION KOC VALUE=1910(954-3600);
WATER SOLUBILITY VALUE 2.9 PH7; OCTANOL WATER 1.5 PH7-9
BENOMYL DECOMPOSES WITHOUT MELTING (90DEGREES CENTIGRADE).