![]() Thus, total chlorine equals the sum of the combined chlorine and free chlorine measurements.įor example, if using completely clean water with no contaminants, the chlorine demand will be zero, and since there will be no inorganic or organic material present, no combined chlorine will be present. Total chlorine is further divided into: 1) combined chlorine, which is the amount of chlorine that has reacted with inorganic (nitrates, etc.) and organic nitrogen-containing molecules (urea, etc.) to make weak disinfectants that are unavailable for disinfection and, 2) Free chlorine, which is the chlorine that is left over and is available to inactivate disease-causing organisms it is a measure of the potability of the water. After the chlorine demand is met, the remaining chlorine is called total chlorine. When chlorine is added to water, some of the chlorine reacts first with inorganic and organic materials and metals in the water and is not available for disinfection (this is called the chlorine demand of the water).
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