Most of devices are set for measurement in range of salinities from fresh to ocean. But in the world exist many lakes and other water bodies with extra-high salinity.
Who knows about the latest advances in device measurement of Dissolved Oxygen in highly saline waters and brines?
Table above gives saturation concentrations for salinities up to saturation point of NaCl and a wide range of temperatures.
For an actual physical measurement, the Winkler titration is the most accurate.
When trying to get a field indication of DO in hypersaline brines using a membrane-type meter, see advice at http://www.deltaenvironmental.com.au/management/Lab_methods/Dissolved_oxygen.htm
Dear Peri, thanks for the advice. Of course, I know about Sherwood's experiments. Now I am summarizing the methods focused on water chemistry in salt water, including my experince gained by last 20 years of work in salt lakes.
As for the Sherwood tables, I should note that this data is acceptable only for NaCl brines. I am hoping for progress in a thermodynamic equation for seawater with different ionic composition in order to know exactly the real solubility. First of all, I mean the Pitzer model.
Dear Oleksandr, I look forward to reading your summary - the in-situ field measurement of DO in hypersaline environments could be much improved with some technical advancements
Dear Peri, I plan to publish it as a book, guide or manual "Determination of nutrients. Application for higly saline waters". It would be great to complete this work by the next ISSLR conference in 2020.
Details of the calibration procedure for polarographic oxygen electrodes and of oxygen solubility in aqueous solutions can also be checked at (pp. 11-16):
Thesis Controlo do Oxigénio Dissolvido em Fermentadores para Minimi...