Premium
The determination of the lonization constant of 2,4‐D in water
Author(s) -
Wershaw R. L.,
Goldberg M. C.,
Pinckney D. J.
Publication year - 1967
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr003i002p00511
Subject(s) - dilution , conductance , groundwater , electrolyte , constant (computer programming) , ionization , sodium , conductivity , pollution , chemistry , ion , thermodynamics , mathematics , physics , geology , geotechnical engineering , ecology , organic chemistry , electrode , combinatorics , biology , computer science , programming language
The compound 2,4‐D ( 2,4 ‐dichlorophenoxyacetic acid) is the most widely used herbicide in the United States, and its widespread use may result in the applied compounds being carried or washed into nearby water courses, rivers, lakes, or groundwater reservoirs. This situation has stimulated basic studies on the chemical and physical behavior of 2,4 ‐D in water. Studies by various authors show that 2,4‐D degrades within several weeks in soils; it can persist for up to six months or more in natural waters. The ionization constant of 2,4‐D has been redetermined at 25°C from conductivity measurements. A value for the ionization constant of 1.169 × 10 −3 was calculated when the equivalent conductance at infinite dilution of 2,4‐D was computed from the equivalent conductance at infinite dilution of the sodium salt of 2,4‐D , using the Kohlraush method of independent ion mobilities. These results differ from those obtained by other workers, who have computed the equivalent conductance at infinite dilution of 2,4‐D , using the equations derived by Fuoss and his co‐workers for the conductance of strong electrolytes in polar solvents. (Key words: Geochemistry; pollution; quality of water)