ARS PESTICIDE PROPERTIES last update May 1995


name:METOLACHLOR                               CASRN: 51218-45-2

molecular formula: C15H22CLNO2
molecular weight : 283.8
physical state   : L
(L=liquid; G=gas; S=solid)
reference: 9CIBAG

_________________________________________________________________________
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):
100    -           0.001mmHg                      H    9ACHB2,2ND ED.,1987

Melting point(deg C):
       -

Decomposition point(deg C):
       -    300                                   H    9PME10

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
STABLE*                          25     5-9      M     9CIBAG

Photolysis (per day):
3.47*                WATER***    25     7        M     9CIBAG
0.087                SOIL**      15-52           M     9CIBAG
0.0187               SOIL***     25-28           M     9CIBAG
0.0097               WATER**     8-45            M     9CIBAG

Vapor pressure (mPa):
4.17                             25              P     8EPAGR
4.27                             25              E     ACSMC8, 225:236,1983
4.2*                             25              M     9CIBAG
1.73                             20              H     9ACHB2,2ND ED.,1987


Water solubility (ppm):     -temp-          -source-   -reference-
500                           20                 C     8GLEAM
488*                          22                 M     9CIBAG
5.3E+2                        20                 E     PSSCBG, 12:222,1981
5.5E+2                        20                 E     ACSMC8, 225:236,1983

Organic solubility (ppm):
SOLUBLE*  BENZENE,HEXANE      20                 H     9PMED8
SOLUBLE*  METHANOL,OCTANE     20                 H     9PMED8
SOLUBLE*  DICHLOROMETHANE     20                 H     9PMED8

Henrys law (Pa m3/mol):
2.44E-3*                      25                 M     9CIBAG

Octanol/water partitioning (log Kow):
3.28                          25                 E     PSSCBG, 12:222,1981
3.04                          20                 E     ACSMC8, 225:236,1983
2.93                          25                 M     9CIBAG
2.6*                          25

Acid dissociation (pKa):


Soil sorption:
soiltype      temp.   Kd     Koc    %om   pH  source   reference
SAND                  1.54   120    2.2   7.8    M     9CIBAG
SANDY LOAM            10.0   307    5.6   6.7    M     9CIBAG
SANDY LOAM            3.18   152    3.6   6.1    M     9CIBAG
SAND                  1.69   242    1.2   6.3    M     9CIBAG
                             70*
SANDY LOAM(CA)               76                  M     9CIBAG
FIVE SOILS                   22-110              M     9CIBAG


Field Dissipation halflife(days):
value           test area        pH           source   reference
30-50                                            H     9HERBH
15-25                                            H     9HERBH
42                                               C     JEVQAA 16:422-428,1987
44                                               E     ETOCDK 8:339-357,1989
180                                              R     8INSFO
97-132                                           M     9CIBAG
12-38                                            M     9CIBAG
141(97-292)*
144            IA                                M     9CIBAG             

Halflife in soil:
Soiltype            aerobic      anaerobic   source    reference
SANDY LOAM(MD)        26*           37*         M      9CIBAG


Comments:
PHOTOLYSIS ** NATURAL LIGHT *** ARTIFICIAL LIGHT