We all realize that, if bathing at home, whether bathing or bathing … very rarely, the eyes are red, unless wired into the soap. But swimming in the pool, almost everyone has red eyes, spicy eyes, some people have skin rashes. Most people think that because too much chlorine (Cl, Chlorine) is used to disinfect water in a new pool, this phenomenon will occur. But this is only partially true!
Chlorine after being added to the water will create two substances that work to disinfect, kill the microorganisms in the water such as bacteria, viruses … that is the acid Hipocarbons ( HClO, Hypochlorous acid) and negative ion of hypochlorite (ClO−, Hypochlorite). These two substances have strong oxidizing properties, so they can kill bacteria. However, they are less irritating to eyes and skin, and are often maintained at a safe concentration for everyone. Because of the strong oxidative acidity of the acid, it will react with ammonia (NH3, Ammonia, Amonia) in swimming pools to make Chloramin (Chloramines).
There will be three reactions when there is hipocide and Ammonia acid, creating three different types of chloramin: monochloramine, dichloramine and trichloramine.
HOCl + NH3 → NH2Cl + H2O (monochloramine)
HOCl + NH2Cl → NHCl2 + H2O (dichloramine)
HOCl + NHCl2 → NCl3 + H2O (trichloramine)
Monochloramine also has bactericidal effects, sometimes monochloramine is also added to water to disinfect. But dichloramine and trichloramine irritate the skin, nose and eyes. Not only that, they also create a very unpleasant odor, many people think that it is chlorine but actually it is the smell of dichloramine and trichloramine.
It may be wonder why there is pool ammonia (NH3) in the pool so that the reagent reacts and produces dichloramine and trichloramine. Of course, no one would intentionally leave Ammonia in the pool. Ammonia has a swimming pool from two main things: our urine and sweat. That’s why there are two things to do when you get down to the pool: pre-shower to clear sweat and absolutely don’t urinate in the pool.
Need a shower and do not urinate in the pool to ensure our own health
In addition to irritating the skin, eyes, nose, and creating an unpleasant odor, the reaction between hipocyanic acid and Ammonium also reduces concentration. The level of the hyacinth acid in water, reduces the ability to kill and disinfect, making us susceptible to microbial contamination. If we come to a swimming pool, we find that the smell is too dark, it is not recommended to swim, because it is not only susceptible to skin and eye irritation but also can be infected with microorganisms.