Standard Test Method for Barium in Brines, Seawater, & Brackish Water by Direct-Current Argon Plasma Atomic Emission Spectroscopy Barium, Brackish water, Brines, Direct-current argon plasma atomic emission, Seawater, Spectroscopy, Argon plasma spectrometry/spectroscopy, Barium content-water, Brackish water/brines, D-C plasma spectrometers, Inorganic compounds-water, Seawater (natural/synthetic)