Sodium dichloroisocyanurate dihydrate

Toxicity of Chlorine Sanitizers. Chlorine-based swimming-pool and spa and hot-tub sanitizers irritate eyes, skin, and mucous membranes and must be handled with extreme care. The toxicities are as follows for chlorine gas, TLV = 1 ppm acute inhalation LC q = 137 ppm for 1 h (mouse) (75). The acute oral LD q (rats) for the Hquid and soHd chlorine sanitizers are NaOCl (100% basis) 8.9 g/kg (76), 65% Ca(OCl)2 850 mg/kg, sodium dichloroisocyanurate dihydrate 735 mg/kg, and trichloroisocyanuric acid 490 mg/kg. Cyanuric acid is essentially nontoxic based on an oral LD q > 20 g/kg in rabbits. Although, it is mildly irritating to the eye, it is not a skin irritant. A review of the toxicological studies on cyanuric acid and its chlorinated derivatives is given in ref. 77. 

Sodium Dichloroisocyanurate Dihydrate (NaDCC). A 10 3 M solution was prepared by dissolving 25.59 mg into a 100-mL volumetric flask with distilled water. 

Six filters for each level of concentration were spiked using variable volume pipettes. The following volumes 13, 25, 50, 100, and 200 yL of the 10 mg/mL solution yielded 0.13, 0.25, 0.50, 1.00 and 2.00 mg of sodium dichloroisocyanurate dihydrate on a filter, respectively. When the filter was dry, the "filter extraction" section was followed. The end-point volumes were converted to milligrams from the calibration curve and the percent recoveries were calculated. 

A computer literature search revealed no direct analytical method specific for sodium dichloroisocyanurate dihydrate (NaDCC) or trichloroisocyanuric acid (TCCA). Each compound dissolved in water released chlorine in the positive oxidation state and formed complex equilibria reactions dependent on the pH of the solutions. NaDCC and TCCA are very strong oxidants and very reactive compounds, therefore, incompatible for chromatographic analysis. The only method that is used for analysis of compounds containing... 

Figure 1. Sodium dichloroisocyanurate dihydrate calibration curve...

Sodium Dichloroisocyanurate Dihydrate Field Sample Results... 

Examples of N-chlorinated organic compounds that gradually hydrolyze to HOCI include chlora-mine-T (N-chloro-p-toluenesulphonamide) (1), N-chlorohydantoins (2), and various chlorinated isocyanurates (3). They are mainly employed as disinfectants, because their low solubility and/or hydrolysis in water affords poor bleaching ability. The one exception is sodium dichloroisocyanurate dihydrate, which is the most water soluble, the fastest to dissolve, and the least hazardous. 

Silver peroxide Sodium bromate Sodium carbonate jjeroxide Sodium chlorate Sodium chlorite Sodium dichloro-s-triazinetrione (sodium dichloroisocyanurate) Sodium dichloro-s-triazinetrione dihydrate Sodium dichromate Sodium perborate (anhydrous)... 

Sodium dichlor Sodiumdichlorisocyanurate Sodium dichlorocyanurate. See Sodium, dichloroisocyanurate Sodium dichloroisocyanurate CAS 2893-78-9 (anhyd.) 51580-86-0 (dihydrate) 54579-28-1 UN 2465 (DOT)... 

Sodium dichloro-s-triazinetrione sodium dichloroisocyanurate or dichlor) [II, 2L2.6. Sodium dichloro-s-triazinetrione, Dichlor, has been used to sanitize pools and spas since the 1960s. Dichlor is usually sold as white granules in either anhydrous or dihydrate forms. The available chlorine for these chemicals are 63% and 56%, respectively. Several companies have recently introduced dichlor combined with other oxidizers. These blended products vary in their available chlorine content. Dichlor is readily soluble and is the only chlorine product with a nearly neutral pH (6.0, 1% solution 25 "C) (NSPI, 1994). Dichlor is used in both pools and spas as a primary sanitizer. Dichlor will react with most other chemicals, especially unstabilized chlorines. Dichlor is sensitive to moisture. 

---