When sodium or calcium hypochlorite is added to water, hypochlorous acid and hypochlorite ion, also known as active free chlorine, are formed. Together these are known as free chlorine. Of the two, hypochlorous acid is the form that has much more power as a disinfectant. The ratio of each of these two forms is determined by the pH of the water. Therefore, the pH value is an important factor to ensure that free chlorine is an effective disinfectant.
Free chlorine analysis using solution methods cannot distinguish between two components: it measures both hypochlorous acid and hypochlorite ion. Therefore, it is important to apply a simple factor to measure the pH value and calculate the amount of active free chlorine used as a disinfectant.
In order to obtain the active free chlorine value, the test result must be interpreted considering the temperature as well as the pH value.
Chlorine is a standard chemical element used to provide clean drinking water to people all over the world. The reason why chlorine is so effective and important for water quality monitoring is that it kills bacteria through a chemical reaction. Using the right amount of chlorine when treating a swimming pool or working in a water treatment plant keeps the water free of impurities.
Percent active chlorine is a unit of concentration used for hypochlorite-based bleaches. One gram of 100 percent active chlorine bleach has as much quantitative bleaching capacity as one gram of free chlorine. The term active chlorine is used because most commercial bleaches contain chlorine in the form of chloride ions that have no bleaching properties.
Liquid bleaches for residential use are divided into three groups:
Free chlorine is the chlorine that is usually tested in pool water. This chlorine is used to sterilize the pool. The pool water should be between 1 and 3 ppm per million.
Our organization also provides active chlorine and free chlorine analysis services with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.
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