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An automated method for determination of chloride and sulfate in freshwater using cation exchange and measurement of electrical conductance
Author(s) -
Stainton M. P.
Publication year - 1974
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1974.19.4.0707
Subject(s) - sulfate , chloride , iodide , chemistry , bromide , inorganic chemistry , fluoride , conductance , nitrate , detection limit , ion exchange , ion , chromatography , organic chemistry , mathematics , combinatorics
A simple automated adaptation of Mackereth’s manual method for determining chloride and sulfate in freshwater is described, using hydrogen ion exchange to convert salts of chloride and sulfate to their free acids with detection by electrical conductance. The use of silver‐saturated exchange resin to precipitate chloride permits distinction between chloride and sulfate. Detection limit is good at 2 µ eq liter −1 with excellent precision (± I.5% at 200 µ eq liter −1 ) . High levels of nitrate, orthophosphate, and fluoride give positive interference for sulfate; bromide and iodide similarly interfere with chloride estimates.