ABSTRACT
Barrera and Martinez1 have compared two methods, the Mohr procedure based on precipitation of silver chloride with a chromate indicator and the mercuric nitrate method based on the formation of soluble, slightly ionized mercuric chloride, for the volumetric determination of chlorides in waste waters. Results are in agreement. The mercuric nitrate method is preferred because the end-point is sharper, a magnetic stirrer is not required, the range of concentrations is 0-700 mg l−1 (against 5-300 mg l−1) and it is less expensive for both high and low chloride concentrations.
