Used in the purification of brine solution in caustic chlorine plants, barium chloride solution effectively removes sulfate impurities by precipitation as barium sulfate. It is also employed in the heat treatment of steel, where it forms a protective layer during hardening processes. In laboratories, it serves as a reagent for testing sulfate ions in qualitative analysis due to the formation of a white precipitate. Additionally, it finds use in the production of other barium compounds and in electroplating baths to improve conductivity and deposit quality. Due to its toxicity, handling requires strict safety controls.