User manual HANNA INSTRUMENTS HI 38013

[. . . ] Alkalinity is critical in the treatments of drinking water, wastewater, boiler & cooling systems and soils. The Hanna Alkalinity Test Kit makes monitoring easy and quick. The compact size gives the user the versatility to use the kit anywhere. [. . . ] · Read off the milliliters of titration solution from the syringe and multiply by 20 to obtain gpg CaCO3 of Total Alkalinity of your sample. www. hannainst. com Dear Customer, Thank you for choosing a Hanna Product. Please read the instruction sheet carefully before using the test kit. It will provide you with the necessary information for correct use of the kit. If you need additional information, do not hesitate to e-mail us at tech@hannainst. com. Remove the chemical test kit from the packing material and SPECIFICATIONS 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: · Phenolphthalein Indicator, 1 bottle with dropper (10 mL); · Bromophenol Blue Indicator, 1 bottle with dropper (10 mL); · HI 38013-0 Alkalinity Reagent, 2 bottles (2x105 mL); · 1 calibrated plastic vessel (20 mL) with cap; · 1 syringe (1 mL) with tip. Note: Any damaged or defective item must be returned in its original packing materials. CHEMICAL REACTION Alkalinity can be measured as Phenolphthalein Alkalinity and Total Alkalinity. The Phenolphthalein Alkalinity is determined by neutralizing the sample to a pH of 8. 3 using a dilute sulfuric acid solution and a phenolphthalein indicator. This process converts hydroxide ions to water, and carbonate ions to bicarbonate ions: ­ ­ 2OH +H2SO4 2H2O+SO42 ­ 2­ 2­ 2CO3 +H2SO4 2HCO3 +SO4 Since bicarbonate ions can be converted to carbonic acid with additional sulfuric acid, the Phenolphthalein Alkalinity measures total hydroxide ions, but only half of the carbonate contribution. To completely convert the carbonate ions, sulfuric acid is added until the sample's pH is 4. 5: 2HCO3­+H2SO4 2H2CO3+SO42­ This is known as Total Alkalinity. mL of titrant x 20 = gpg CaCO3 mL of titrant x 20 = gpg CaCO3 INSTRUCTIONS READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KIT Determination of Phenolphthalein Alkalinity · Remove the cap from the plastic vessel. Rinse the plastic vessel with water sample, fill to the 5 mL mark 5 mL and replace the cap. · Add 1 drop of Phenolphthalein Indicator through the cap port, and mix carefully by swirling the vessel in tight circles. If the solution remains colorless, record the phenolphthalein alkalinity as zero, and proceed with the procedure for the determination of Total Alkalinity (see below). [. . . ] Proceed with the test as described before. Read off the milliliters of titration solution from the syringe and multiply by 10 to obtain the result for both Phenolphthalein and Total Alkalinity as gpg CaCO3. mL of titrant x 10 = gpg CaCO3 REFERENCES 1987 Annual Book of ASTM Standard, Volume 11. 01 Water (1), pages 151-158. Official Methods of Analysis, A. O. A. C. , 14th Edition, 1984. [. . . ]