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Trichloroisocyanuric Acid (TCCA) Compare with Sodium Dichloroisocyanuric Acid in Workplace Atmospheres

An aliquot of the sample is reacted with acidic potassium iodide. Trichloroisocyanuric Acid (TCCA) and sodium dichloroisocyanuric acid react with the potassium iodide to form iodine which is measured with an ion specific electrode. Chlorine gas is analyzed separately by following ID-101. This method describes the collection and analysis of airborne trichloroisocyanuric acid and sodium dichloroisocyanuric acid. The analysis is based on an iodometric technique utilizing an ion specific electrode.
Trichloroisocyanuric acid and dichloroisocyanuric acid are used as a source of available chlorine in "dry type" bleaches, scouring powders, dishwashing compounds, and sanitizing compounds. The physical and chemical properties of trichloro and dichloro isocyanuric acids are:Trichloroisocyanuric acid - C3Cl3N3O3; mole. wt. 232.42. C 15-50%, Cl 45.77%, N 18.08%, 0 20.65%. Prepared by chlorinating cyanuric acid in 5% NaOH solution: Hands, Whitt., Soc. Chem. Ind. 67,66 (1948); Hardy U.S. pat. 2,607,738 (1952 to Monsanto). Purification by dissolving in conc. H2SO4 and diluting with ice water: Lorenz, U.S. pat. 2,828,308 (1958 to Purex Corp.). May be stored in the dry state for at least a year. Releases hypochlorous acid on contact with water. Available chlorine about 90%. pH of aqueous soln. about 4.4. Solubility in water at 25°C about 0.2%. Soluble in chlorinated and highly polar solvents. Dichloroisocyanuric acid - C3Cl2NaN3O3; mole. wt. 236.06. C 15.26%, Cl 30.04%, Na 16.56%, N 17.80%, 0 20.33%. Structure studies and preparation: Petterson et.al., J. Org. Chem. 25, 1595 (1960). Preparation from trisodium isocyanurate and gaseous Cl: Symes et.al., U.S. pats. 3,035,056 and 3,035,057 (1962 to Monsanto).
Trichloroisocyanuric Acid (TCCA) use for swimming pool water treatment: clean swimming pool has been trouble people for a long time. If you do not use the treatment agent, the water will need frequent replacement, otherwise it is easy to breed bacteria, on the wall with a layer of adherent and slippery and dirty microbe algae, water also issued an unpleasant odor. At present, most domestic swimming pool using bleaching powder Ca (CIO) 2 disinfection, but Ca (CIO) 2 decomposition, storage difficulties, easy to scale the wall of the pool, sour water often need to adjust the PH value. However, TCCA has four major advantages: (1) After the release of available chlorine, leaving cyanurate available chlorine in water has a stabilizing effect, which itself is non-toxic; (2) have small effect on swimming pool water, reduction of the the need for PH value regulator; and (3) killing bacterial cell; (4) storage stability. It is the best agent for swimming pool water treatment, long-term use can make the wall without algae.