Chloride ions are one of the major inorganic anions in water and wastewater. Although high concentrations of chloride in water are not known to be toxic to humans, its regulation is mainly due to taste. It is essential to monitor chloride concentration in boiler systems to prevent damage of metal parts. In high levels, chloride can corrode stainless steel and be toxic to plant life.

Hanna Instruments offers a wide variety of instrumentation for measuring chloride. Products include portable and benchtop pH/ISE meters that can use a solid-state chloride Ion-Selective Electrode (ISE) for direct measurement. In addition, Hanna offers portable photometers, checker colorimeters, and chemical test kits.

The argentometric titration for chloride is a very common measurement when determining the sodium content in food. In this titration sodium chloride reacts with silver nitrate to form silver chloride precipitate. The precipitation of chloride results in less free chloride in the sample which is detected by a chloride ISE. A silver ISE is also used as a detector tol sense the free silver ions once all the chloride has been reacted with. The argentometric titration is used in other industries where sodium concentration can be inferred by the chloride that is present and for ones that are looking to determine the concentration of chloride.