[Bromide]
Bromide is present in typical seawater (35 PSU) with a concentration of around 65 mg/L, which is around 0.2% of all dissolved salts. Seafoods and deep sea plants generally have high levels of bromide, while foods derived from land have variable amounts. Bromargyryte - natural, crystalline silver bromide - is the most common bromide mineral currently known. It is still very rare. Beside silver, bromine is sometimes found in minerals combined with mercury and copper.
One can test for a bromide ion by adding excess dilute HNO3 followed by dilute aqueous AgNO3 solution. The formation of creamy silver bromide precipitate confirms the existence of bromides.
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