Hanna Instruments HI 3812 Instruction Manual

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Instruction Manualwww.hannainst.comDear Customer,Thank you for choosing a Hanna Product.Please read the instructions carefully before using the chemicaltest kit. It will provide you with the necessary information forcorrect use of the kit.Remove the chemical test kit from the packing material andexamine it carefully to make sure that no damage hasoccurred during shipping. If there is any noticeable damage,notify your Dealer or the nearest Hanna office immediately.Each kit is supplied with:• Reagent 1, 1 bottle with dropper (30 mL);• Reagent 2, 1 bottle with dropper (10 mL);• Reagent 3, 1 bottle (120 mL);• 2 beakers (10 mL and 50 mL);• 1 graduated syringe.Note: Any damaged or defective item must be returned inits original packing materials.HI 3812Hardness Test KitISTR3812 09/99 PRINTED IN ITALYIn history, water hardness was defined by the capacity ofwater to precipitate soap. The ionic species in the watercausing the precipitation was later found to be primarilycalcium and magnesium. In the present, therefore, waterhardness is actually a quantitative measure of these ions inthe water sample. It is also now known that certain otherion species, such as iron, zinc and manganese, contribute tothe overall water hardness. The measure and subsequentcontrol of water hardness is essential to prevent scaling andclogging in water pipes. The Hanna hardness test kit makesmonitoring easy, quick and safe. The compact size providesthe versatility to use the kit anywhere. The design makes thekit easy to handle and, except for Reagent 3, practicallyprevents accidental injury or damage due to spills.Range 0 to 30 mg/L (ppm) CaCO30 to 300 mg/L (ppm) CaCO3Smallest Increment 0.3 mg/L [in the 0-30 mg/L range]3 mg/L [in the 0-300 mg/L range]Analysis Method EDTA titrationSample Size 5 mL and 50 mL (average)Number of Tests 100 (average)Case Dimensions 200x120x60 mm (7.9x4.7x2.4")Shipping Weight 460 g (1 lb.)SPECIFICATIONSSPECIFICATIONSSPECIFICATIONSSPECIFICATIONSSPECIFICATIONSSIGNIFICANCE AND USESIGNIFICANCE AND USESIGNIFICANCE AND USESIGNIFICANCE AND USESIGNIFICANCE AND USECHEMICAL REACTIONCHEMICAL REACTIONCHEMICAL REACTIONCHEMICAL REACTIONCHEMICAL REACTIONThe hardness level as mg/L (ppm) calcium carbonate is deter-mined by an EDTA (ethylene-diamine-tetraacetic acid) titration.The solution is first adjusted to a pH of 10 using a buffersolution. The indicator chelates with metal ions such as mag-nesium or calcium to form a red colored complex. As EDTA isadded, metal ions complex with it. After all the free metal ionshave been complexed, an excess EDTA removes the metal ionscomplexed with the indicator to form a blue colored solution.This color change from red to blue is the endpoint of thetitration.READ ALL THE INSTRUCTIONS BEFORE USING THE TEST KITLOOK AT THE BACK PAGE FOR THE ILLUSTRATED PROCEDURENote: Push and twist pipet tip into tapered end of syringeensuring an air-tight fit.HIGH RANGE – 0 to 300 mg/L CaCO3• Remove the cap from the small plas-tic vessel. Rinse the plastic vesselwith the water sample, fill to the 5mL mark and replace the cap.• Add 5 drops of Reagent 1 through the cap port and mixcarefully swirling the vessel in tight circles.INSTRUCTIONSINSTRUCTIONSINSTRUCTIONSINSTRUCTIONSINSTRUCTIONS• Add 1 drop of Reagent 2 through the cap port and mix asdescribed above. The solution becomes a red-violet color.• Take the titration syringe and push the plungercompletely into the syringe. Insert tip into Re-agent 3 and pull the plunger out until the loweredge of the seal is on the 0 mark of the syringe.• Place the syringe tip into the cap port of theplastic vessel and slowly add the titration solu-tion dropwise, swirling to mix after each drop.Continue adding the titration solution until thesolution becomes purple, then mix for 15 sec-onds after each additional drop until the solutionturns blue.• Read off the milliliters of titration solution from the syringescale and multiply by 300 to obtain mg/L (ppm) CaCO3.LOW RANGE – 0 to 30 mg/L CaCO3If result is lower than 30 mg/L, the precision of the test canbe improved by following the steps below.• Remove the cap from the largeplastic vessel. Rinse it with thewater sample, fill to the 50 mLmark and replace the cap.• Proceed with the titration as for the high range test.• Read off the milliliters of titration solution from the syringescale and multiply by 30 to obtain mg/L (ppm) CaCO3.x 300 = mg/L CaCO 3x 30 = mg/L CaCO 3REFERENCESREFERENCESREFERENCESREFERENCESREFERENCESStandard Methods for the Examination of Water and Waste-water, 16th Edition, 1985, p. 210-214.1987 Annual Book of ASTM Standard, vol. 11.01 Water (1),p. 212-215.HEALTH AND SAFETYHEALTH AND SAFETYHEALTH AND SAFETYHEALTH AND SAFETYHEALTH AND SAFETYThe chemicals contained in this test kit may be hazardous ifimproperly handled. Read Health and Safety Data Sheetsbefore performing the test.

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