ARS PESTICIDE PROPERTIES last update May 1995


name:MALATHION                                 CASRN: 121-75-5

molecular formula: C10H19O6PS2
molecular weight : 330.4
physical state   : L
(L=liquid; G=gas; S=solid)
reference: 9MERCK 

_________________________________________________________________________
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):
156    -    157      0.7mmHg                     H     9MERCK

Melting point(deg C):
2.9    -                                         H     9MERCK

Decomposition point(deg C):
       -

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
0.00650*                         25     5        M     9AMCY1
0.11                             25     7        M     9AMCY1
1.41                             25     9        M     9AMCY1

Photolysis (per day):

Vapor pressure (mPa):
0.7                              20              E     PSSCBG 4:137-147,1973
5.3                              30              H     9ACHB2
0.45*                            25              M     9AMYC1
3.0                              35              M     9AMCY1
18.6                             45              M     9AMCY1


Water solubility (ppm):       -temp-        -source-  -reference-
145                                            H       9ACHB2 1983 ED.
130*                                           M       9AMCY1

Organic solubility (ppm):
MISCIBLE  MOST ORGANIC SOLVS.                  H       9PMED8
LIMITED   PETROLEUM OILS                       H       9PMED8

Henrys law (Pa m3/mol):
0.00114*                                       M       9AMCY1

Octanol/water partitioning (log Kow):
2.7*                                           M       9AMCY1

Acid dissociation (pKa):

Soil sorption:
soiltype        temp.   Kd      Koc      %om   pH    reference
                                1797                 JEVQAA 16:422-428,1987
                                280                  EESADV
                                93                   JAFCAU 29:1050-1059,1981
                                1800                 SCSFAD 44:1-8,1985
                                1790                 8INSFO
                                1778                 8AGMAW
                                1200*

Field Dissipation halflife(days):
value             test area        pH        source  reference
25                                              C    8GLEAM
0.2-1.6                                         E    PSSCBG 19:101-112,1987 
CA 1                                            M    9AMCY1
9(0.2-25)*

Halflife in soil:
Soiltype              aerobic      anaerobic   source    reference
SNDY LOAM, SLT LOAM     <1*                       M      9AMCY1


Comments: