Possibilities of the photoluminescence method for determining the oxygen concentration in the redox zone of the Black Sea in comparison with other methods |
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| Authors: | P A Stunzhas V E Mosharov V N Radchenko |
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| Institution: | 1. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia
2. Zhukovskii Central Aerohydrodynamics Institute, Zhukovskii, Russia
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| Abstract: | Different methods of measuring low oxygen concentrations were compared in July 2008 in the Black Sea: the conventional Winkler method, electrochemical sensors (membrane and membrane-free), and two modifications of photoluminescence sensors. The membrane-free sensor used in the Black Sea since 1999 and the domestic photoluminescence sensor showed the best results: agreement of data, possibility of fine oxygen distribution resolution, and absence of the oxygen and hydrogen sulfide coexistence layer. The latter has good technical characteristics: high oxygen sensitivity and complete inertness to hydrogen sulfide, possibility of calibration in a gaseous environment, and a relatively low time constant (5–6 s). An equation was suggested for dynamic correction of data in the testing mode, which eliminates hysteresis of data on probe descent and ascent to a significant degree. It was shown that the oxygen concentration above the hydrogen sulfide layer in the subreductive zone of the Black Sea did not exceed 0.02 μM. |
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