Why does the Dead Sea contain more bromine than ordinary seawater?

The premise that the Dead Sea contains more bromine than ordinary seawater is correct. While the ocean contains approximately 65 to 70 parts per million (ppm) of bromine by weight, the Dead Sea contains a significantly higher concentration, approximately 5 grams per liter (or about 0.5 percent).12

The Dead Sea is a terminal lake with no outlet, meaning that water leaves the system only through evaporation. Over time, this process has led to the extreme accumulation and concentration of dissolved minerals and salts, including bromides, which are left behind as the water evaporates. Consequently, the Dead Sea serves as a major natural reservoir for these minerals, making it a commercially significant source for the extraction of bromine and other chemical products.3451