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Optical measurements of nitrate and H2S concentrations in Baltic waters

Nitrate and H2S concentrations were measured in 31 water samples from 4 CTD Stations in the North Atlantic and 234 water samples from all basins of the Baltic Sea, using standard wet chemical laboratory methods in parallel with a commercial in situ absorption spectrometer. The parameters for fitting the absorption spectra to sets of calibration spectra were optimized as a preparation to use the commercial instrument in situ.