Determination of Chloride (SM 4500-Cl-B Method)

First launched in 2002, the National Environmental Methods Index (NEMI) is a database of environmental methods, protocols, statistical and analytical methods and procedures that allow scientists and managers to find and compare methods for all phases of the monitoring process. NEMI has been updated several times to take advantage of better technology each time, to include new types of methods, or both.

In the 4500-Cl B iodometric method, chlorine liberates free iodine from potassium iodide solutions at pH 8 or below. The liberated iodine is titrated with a standard sodium thiosulfate solution with starch as the indicator. The pH should be titrated to 3-4 because the reaction is non-stoichiometric at neutral pH due to partial oxidation of thiosulfate to sulfate. This iodometric method is suitable for measuring total chlorine concentrations greater than 1 mg/L in natural and treated water. Does not apply to estuarine or sea waters.

Chlorine in aqueous solution is not stable and the chlorine content of weak solutions decreases rapidly. Exposure to sunlight or strong light, or shaking, accelerates the reduction of chlorine. This Therefore, excessive light and shaking should be avoided. Samples to be analyzed for chlorine should not be stored.

In the tests and analyzes carried out in our organization, which has a wide range of technological equipment, trained and experienced staff and applies the most modern methods, national and international standards and legal regulations in force are complied with. Among the numerous tests performed in this context, there are also chloride determination (SM 4500-Cl-B method) services.