ARS PESTICIDE PROPERTIES last update May 1995


name:MCPA                                      CASRN: 94-74-6

molecular formula: C9H9CLO3
molecular weight : 200.62
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):
118    -    119                                  H     9ACHB2

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):

Photolysis (per day):

Vapor pressure (mPa):
0.2*                          20                 H     9ACHB2


Water solubility (ppm):     -temp-            -source-  -reference-
825*                          20
825                           RT                 H     9ACHB2
2.7E05                        RT                 M     9RHPOU
8.66E05                       RT                 M     9RHPOU

Organic solubility (ppm):
1.53E+6*  ETHANOL             25                 H     9PMED8
7.7E+5*   DIETHYL ETHER       25                 H     9PMED8
6.2E+4*   TOLUENE             25                 H     9PMED8
4.9E+4*   XYLENE              25                 H     9PMED8
5E+3*     HEPTANE             25                 H     9PMED8

Henrys law (Pa m3/mol):
4.86E-5*                      20                 H     9ACHB2

Octanol/water partitioning (log Kow):
2.8                                              M     9RHPOU

Acid dissociation (pKa):
3.05                          25                 E     ESTHAG 3:1186-1183,1969
3.11                                             C     8CREAM
                                                 R     ADCSAJ 111:55-120,1972
3.13                                             E     JAFCAU 26:289-292,1978
3.07                                             H     9ACHB2 7TH ED.,1977
3.09*                         20


Soil sorption:
soiltype      temp.   Kd     Koc    %om   pH  source  reference
                             10                 C     8CREAM
                             110*

Field Dissipation halflife(days):
value           test area        pH   %OM     source  reference
30                                              H     9ACHB2 1983 ED.
7-60                                            H     9HERBH
6                                               R     PSSCBG 19:101-112,1987
25                                              C     8OUSSD
15-43                                           R     RREVAH 80:65-135,1981
25(6-60)*

Halflife in soil:
Soiltype           aerobic      anaerobic   source    reference


Comments:
WATER SOLUBILITY 2.7E05=NaSALT; 8.66E05=DIMETHYLAMINE SALT