Abstract
In this work, we analyzed the discharge process and optical emission spectra from the microarc discharges operated in three types of highly conductive liquids: artificial seawater with 10 main components, reference solutions each containing a single component, and a standard Fe solution. Microarc discharges were operated at a low breakdown voltage (below 600 V) using a needle-to-plate electrode system immersed in each liquid in a quartz cuvette. Optical emission spectra were collected from discharges ignited in each liquid. Owing to the complex composition of seawater, spectra from discharges in different liquids were compared to assign the emission peaks. The proposed method showed good potential for the detection of Fe and other metals in seawater. Using the present setup, it was possible to detect Fe impurities at a concentration of 300 ppm. The possibility of using atomic emission spectroscopy of microarc discharges in seawater for on-site elemental composition analysis has been demonstrated.
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