The radiochemical determination of trace amounts of chloride

Trace amounts of chloride may be determined radiochemically by treating a nonvolatile chloride with a known amount of³⁶Cl labelled hydrochloric acid, evaporating to dryness, and measuring the radioactivity of the residue. In the range 10–100 μg the accuracy is within 3 μg, and in the range of 1–10 μg it is within one microgram. The elimination of certain interferences is demonstrated in the application of the method to one millilitre aliquots of natural water.