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Conductometric Titration of Soils for Cation‐Exchange Capacity
Author(s) -
Mortland M. M.,
Mellor J. L.
Publication year - 1954
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1954.03615995001800040003x
Subject(s) - conductometry , chemistry , titration , barium , cation exchange capacity , sulfate , conductance , inorganic chemistry , ion exchange , soil water , ion , soil science , geology , organic chemistry , mathematics , combinatorics
The reaction of barium‐saturated soil with the sulfate anion of a standardized titrating solution to form insoluble barium sulfate is utilized for determining soil cation‐exchange capacity. The endpoint of the reaction is determined by conductometric titration. Specific conductance remains comparatively constant while the barium on the exchange complex is being titrated. After the barium has been titrated, conductance increases as increments of the titrating solution are added. The endpoint of the reaction is obtained from the intersection of the two linear portions of the curve. Cation‐exchange capacity data obtained by this method are compared with data obtained by other methods on the same soils.