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A Compact Potentiometric Sensor of Novel Design. In Situ Determination of p H, p S 2− , and Eh
Author(s) -
Whitfield M.
Publication year - 1971
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.1971.16.5.0829
Subject(s) - electrode , potentiometric titration , glass electrode , analytical chemistry (journal) , epoxy , mercury (programming language) , glass tube , materials science , chemistry , mineralogy , composite material , reference electrode , electrochemistry , chromatography , tube (container) , computer science , programming language
A rugged, compact probe (2 cm overall diameter, 9 cm overall length) is described that enables p H, p S 2- , and Eh to be measured in situ. A miniature glass electrode is mounted in an epoxy resin body to which the metal electrodes are cemented. The glass electrode is mercury filled and has a cylindrical sensing membrane. The resulting probe is relatively insensitive to vibration and to changes in light intensity and the glass electrode equilibrates rapidly to ambient temperature and pressure changes. Construction details are given. With appropriate holders the probe can be used for measurements in the water column, in the sediment, or in the intertidal zone. The performance of the unit is illustrated by data from a stagnant basin model and from an estuarine survey.