ARS PESTICIDE PROPERTIES DATABASE last updated May 1995

name: MSMA                           CASRN: 2163-80-6    

molecular formula: CH4AsNaO3                  
molecular weight: 162.0                      
physical state: S                      
(L=liquid; G=gas; S=solid)
reference: 9PMED9

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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.
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value              medium     temp.    pH  source   reference
-----              ------     -----    --  ------   ---------

Boiling point (deg C):

Melting point (deg C):
113 - 116                                    H      9PME10

Decomposition point (deg C):

Heat of vaporization (deg C):

--RATE CONSTANTS--

Hydrolysis (per day):

Photolysis (per day):

Vapor pressure (mPa):
0.01                            25           H      9PME10

Water solubility (ppm): 
1.4E6*                          20           H      9PMED9
5.7E4                           20           C      8GLEAM
1E6                             20           P      6USEPA

Organic solubility (ppm):
SOLUBLE     METHANOL                         H      9PME10
INSOLUBLE MOST ORGANIC SOLVS.                H      9PME10

Henrys law (Pa m3/mol):
1.16E-9                                      H      9PME10

Octanol/water partitioning (log Kow):

Acid dissociation (pKa):
                                                          

Soil sorption:
soiltype         temp.    Kd     Koc    %om    pH   reference
--------         -----    --     ---    ---    --   ---------
                                 300000             8GLEAM
                                 4167               6USEPA
                                 2653               6USEPA
                                 443                6USEPA
                                 576                6USEPA
                                 50000              6USEPA
                                 2000-              JEVQAA 4: 355-358 (1975)
                                  2500              
SAND                             250                9PME10
SANDY LOAM                       2850               9PME10
                                 7000*              W

Field dissipation halflife(days):
value              test area          pH    source  reference
-----              ---------          --    ------  ---------
10                                           C      8GLEAM
750                                          E      WEESA6 22: 272-275 (1974)
2372                                         E      6NETHJ 17: 128-132 (1969)
180*                                         R      6ACSAR pp. 53-69 (1974)

Halflife in soil:
soiltype           aerobic  anaerobic       source  reference
--------           -------  ---------       ------  ---------

Comments: