User manual HANNA INSTRUMENTS HI 38015

[. . . ] Note: To measure exactly 0. 25 mL of sample with the syringe, push the plunger completely into the syringe and insert the tip into sample. Pull the plunger out until the lower edge of the seal is on 0. 0 mL mark of the syringe. Insert the syringe into the vessel and push the sample out until the lower edge of the seal is on the 0. 25 mL mark (the longer mark between 0. 2 and 0. 3). [. . . ] Although high concentrations of chloride in water are not known to be toxic to humans, its regulation is mainly due to adverse effect on taste. It is essential to monitor chloride concentration in boiler systems to prevent metal parts being damaged. In high levels, chloride can corrode stainless steel and be toxic to plant life. The Hanna Test Kit is equipped with all you need to determine chloride level of water. Note: mg/L is equivalent to ppm (parts per million). 6- While swirling the vessel, add 10 drops of HI 38015B-0 reagent through the cap port. The solution will become a yellow color. 7- Take the titration syringe (T labeled), and push the plunger completely into the syringe. Insert tip into HI 38015C-0 solution and pull the plunger out until the lower edge of the plunger seal is on the 0 mL mark of the syringe. Caution: Avoid skin and eyes contact with HI 38015C-0 reagent. It may cause irritation to eyes and dark spots on skin for some time. 8- Place the syringe into the cap of the plastic vessel and slowly add the titration solution one drop at a time. Continue adding titration solution until the solution in the plastic vessel changes from yellow to brick-red. x 10 CHEMICAL REACTION The chloride level in mg/L (ppm) is determined by a silver nitrate titration, using potassium chromate as indicator. The color change from yellow to brick-red determines the end point of this titration. PRINTED IN ITALY 3- Replace the cap and shake gently for at least 2 minutes. 4- Flip open the top of the Demineralizer Bottle cap. [. . . ] Interferences: Bromide, iodide, cyanide and sulfide; orthophosphate above 250 ppm and polyphosphate above 25 ppm precipitate as silver salts; iron above 10 ppm masks the endpoint. Intensely colored samples should be adequately treated before performing the test. Suspended matter in large amounts should be removed by prior filtration. REFERENCES Official Methods of Analysis, A. O. A. C. , 14th Edition, 1984, p. [. . . ]