Tracer monitored titrations: measurement of dissolved oxygen |
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| Authors: | Martz Todd Takeshita Yuichiro Rolph Rebecca Bresnahan Philip |
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| Affiliation: | University of California, San Diego, Scripps Institution of Oceanography, La Jolla, California 92093, USA. trmartz@ucsd.edu |
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| Abstract: | The tracer monitored titration (TMT) technique is evaluated for measurement of dissolved oxygen. The TMT developed in this work uses a simple apparatus consisting of a low-precision pump for titrant delivery and an optical detector based on a white LED and two photodiodes with interference filters. It is shown that the classic Winkler method can be made free of routine volumetric and gravimetric measurements by application of TMT theory, which allows tracking the amounts of titrant and sample using a chemical tracer. The measurement precision of the prototype setup was 0.3% RSD. |
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