ARS PESTICIDE PROPERTIES DATABASE last updated May 1995

name: MALEIC HYDRAZIDE ACID          CASRN: 123-33-1     

molecular formula: C4H4N2O2                   
molecular weight: 112.1                      
physical state: S                      
(L=liquid; G=gas; S=solid)
reference: 9PME10

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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.
__________________________________________________________________________

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

Boiling point (deg C):

Melting point (deg C):
298 - 300                                    H      9PME10

Decomposition point (deg C):
260                                          H      6MONTG

Heat of vaporization (deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
STABLE                                       H      9PME10

Photolysis (per day):
0.012                                  5,7   H      9PME10
0.020                                  9     H      9PME10

Vapor pressure (mPa):
<1E-5                           20           P      6EPAPF vol. II
<0.01*                          25           H      9PME10

Water solubility (ppm): 
4507*                           25           H      9PME10
4417                                    4.3  H      9PME10
6000                            25           H      9PMED9

Organic solubility (ppm):
4179        METHANOL            25           H      9PME10 

Henrys law (Pa m3/mol):
<2.5E-7                         25           H      9PME10

Octanol/water partitioning (log Kow):
0.011*                                  7    H      9PME10
-1.96                                        H      6MONTG

Acid dissociation (pKa):
5.62                            20           H      9PME10
                                                                 

Soil sorption:
soiltype         temp.    Kd     Koc    %om    pH   reference
--------         -----    --     ---    ---    --   --------- 
                                 25-450             6USEPA
                                 251*               6GERST

Field dissipation halflife(days):
value              test area          pH    source  reference
-----              ---------          --    ------  ---------
45                                           P      6USEPA
3-7                NEW MEX.                  P      6USEPA
28-70                                        R      9KKDOH V2,CHAP17:815-33,1976
14-56                                        H      9ACHB2 1983
63                                           E      WEREAT 15: 53-58 (1975)
0.5                                          H      9PME10
30*                                          W

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

Comments: