Abstract
With an objective in mind of determining bromine and iodine in natural waters, procedures for the determination minute amounts of Br-and I- in a large amount of CI- have been investigated. The sum of bromine and iodine was sought by Kolthoff's method and the amount iodine by Winkler's method. The amount of bromine then was caclulated from the difference. The estimation of 0.021 mg Br- and I- in the presence of several thousand times their weight of Cl- was possible by this method. The presence of a normal amount of Na+, K+, Ca2+, Mg2+, Fe, Mn, HCO3-, SO42-, etc. in hot spring water or in oil well brine did not interfere. When the sum of bromine and iodine was less than 0.5 mg/l, the solution was made alkaline with sodium carbonate and concentrated by heating on a water bath. The amount of sample solution to be taken for analysis can be determined by its chlorine content since ratio Br/Cl and I/Cl were both found to be almost constant in case of hot spring water as well as oil well brine.
