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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Original Russian Text © P.A. Stunzhas, V.E. Mosharov, V.N. Radchenko, 2013, published in Okeanologiya, 2013, Vol. 53, No. 4, pp. 558–568.
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Stunzhas, P.A., Mosharov, V.E. & Radchenko, V.N. Possibilities of the photoluminescence method for determining the oxygen concentration in the redox zone of the Black Sea in comparison with other methods. Oceanology 53, 498–507 (2013). https://doi.org/10.1134/S0001437013040139
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DOI: https://doi.org/10.1134/S0001437013040139