ARS PESTICIDE PROPERTIES last update May 1995


name:MALEIC HYDRAZIDE K SALT                   CASRN: 51542-52-0

molecular formula: C4H3KN2O2
molecular weight : 150.2
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):
298    -    300 (parent)                         M     6UNIRO

Decomposition point(deg C):
225    -    (parent)                             M     6UNIRO

Heat of vaporization(deg C):

--RATE CONSTANTS--

Hydrolysis (per day):
STABLE*                          25     3,6,9    M     6UNIRO

Photolysis (per day):
STABLE*              SOIL        25              M     6UNIRO
0.02*                WATER       25     9        M     6UNIRO
0.012                WATER       25     5,7      M     6UNIRO

Vapor pressure (mPa):
1E-02 (parent)                   25              M     6UNIRO
0.0 SALT


Water solubility (ppm):     -temp-          -source-  -reference-
4500*  (parent)               25
3.4E5*                        25
4417   (parent)                                  M     6UNIRO
4507   (parent)               25.5               M     6UNIRO
337,000                       AMB.               M     6UNIRO
400,000*                      25                 H     9ACHB2 1983 ED.

Organic solubility (ppm):(parent)
<1*       HEXANE                                 M     6UNIRO
4.18E3*   METHANOL                               M     6UNIRO
<1*       TOLUENE                                M     6UNIRO

Henrys law (Pa m3/mol):(parent)
3.3E-7*                       25                 M     6UNIRO

Octanol/water partitioning (log Kow):
-0.68*  (pH5)                                    M     6UNIRO
-2.41*  (pH9)                                    M     6UNIRO
-1.96*  (pH7)                                    M     6UNRIO

Acid dissociation (pKa):
5.65*                                            E     PSSCBG 19:101-112,1987
5.62                          20                 M     6UNIRO


Soil sorption:
soiltype        temp.   Kd      Koc      %om   pH      reference
                                40*                    EESADV


Field Dissipation halflife(days):
value          test area        pH            source   reference
15.9                                             M     6UNIRO
14-100                                           P     8EPAGR
36(14-100)*

Halflife in soil:
Soiltype            aerobic      anaerobic    source   reference
                     0.46*                       M     6UNIRO


Comments:
HENRYS LAW VALUE 3.3E-07=PARENT, PH7;