User manual HANNA INSTRUMENTS HI 3831

[. . . ] Instruction Manual SIGNIFICANCE AND USE In pools and drinking water supplies, chlorination serves to kill or deactivate disease-producing microorganisms. It can also improve water quality by reacting with ammonia, iron, sulfide and some organic substances. [. . . ] It will provide you with the necessary information for a correct use of the kit. SPECIFICATIONS Remove the chemical test kit from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest Hanna office immediately. Each kit is supplied with: · Calibrated vessel (50 mL); · Reagent 1 (30 mL); · Reagent 2 (30 mL); · Reagent 3 (30 mL); · Color Comparison Cube. Note: Any damaged or defective item must be returned in its original packing materials. CHEMICAL REACTION The addition of chlorine to water produces hydrochloric and hypochlorous acids. The hypochlorous acid acts as the disinfectant and bleaching agent. The formation of chloroamines and nitrogen trichloride will occur if ammonia is present. Both, free and total chlorine are measured by a colorimetric method. The sample is initially treated with a phosphate buffer to a pH of approximately 6. 3 pH. The addition of DPD (N, N-diethyl-p-phenylenediamine) is immediately oxidized by chlorine producing a reddish color. The color intensity of the solution determines the free chlorine concentration. The total chlorine determination requires an excess addition of iodide ions to the solutions. [. . . ] Bound Chlorine · The concentration of bound chlorine in the sample is determined by subtracting the free chlorine result from the total chlorine result. PRINTED IN ITALY SPECIFICATIONS Range Analysis Method Sample Size Number of Tests Case Dimensions Shipping Weight 0 to 2. 5 mg/L (ppm) Chlorine Colorimetric 5 mL 110 (average) 200x120x60 mm (7. 9x4. 7x2. 4") 460 g (1 lb. ) REFERENCES Standard Methods for the Examination of Water and Wastewater, 16th Edition, 1985, pages 309-310. · Determine which color band best matches the solution in the vessel and record the results in mg/L (ppm) free chlorine. Total Chlorine · Add 5 drops of Reagent 1, 2 drops of Reagent 3 and 3 drops of Reagent 2 to the color comparison cube. 5 2 3 02/98 ACCESSORIES HI 3831-100 Spare reagents (100 tests) ISTR3831R1 [. . . ]