User manual HANNA INSTRUMENTS HI 3820

[. . . ] Today, our water supplies are becoming more contaminated with corrosive chemicals from industrial dumping or acid rain. Therefore, acidity measurements are an essential monitoring device to define and control pollution in sewers, lakes and rivers. Acidity of water is equally important to monitor in soils and fish farming to maximize the growing environment. [. . . ] Rinse the vessel with water sample, fill to the 25 mL mark and replace the cap. · Proceed with the test as explained for high range measurements. · To obtain the results for both methyl orange and phenolphthalein acidity, multiply the read off the syringe by 100. www. hannainst. com Dear Customer, Thank you for choosing a Hanna Product. Please read the instructions carefully before using the chemical test kit. It will provide you with the necessary information for correct use of the kit. 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: · Dechlorinating reagent, 1 bottle with dropper (10 mL); · Bromophenol Blue Indicator, 1 bottle with dropper (10 mL); · Phenolphtalein Indicator, 1 bottle with dropper (10 mL); · HI 3820-0, 1 bottle (120 mL); · 2 calibrated vessels (10 and 50 mL); · 1 calibrated syringe. Note: Any damaged or defective item must be returned in its original packing materials. indicator and mix. If the solution is green or blue, then record the methyl orange acidity as zero. Proceed with procedure for the determination of phenolphthalein acidity. If the solution is yellow proceed with the next step. · Take the titration syringe and push the plunger completely into the syringe. Insert tip into HI 3820-0 solution and pull the plunger out until the lower edge of the plunger seal is on the 0 mL mark of the syringe. · Place the syringe tip into the cap port of the plastic vessel and slowly add the titration solution drop-wise, swirling to mix after each drop. Continue adding titration solution until the solution in the plastic vessel changes from yellow to green. · Read off the milliliters of titration solution from the syringe scale and multiply by 500 to obtain mg/L (ppm) CaCO3. x 500 = mg/L CaCO3 CHEMICAL REACTION Strong acids (such as mineral acids) and organic acids can contribute to the acidity of a water sample. With the use of diluted sodium hydroxide as the titrant and bromphenol blue or phenolphthalein indicators, the contribution of strong or organic acids can be determined. [. . . ] Determination of Methyl Orange Acidity · Remove the cap from the small plastic vessel. Rinse the vessel with water sample, fill to the 5 mL mark and replace the cap. · Add 1 drop of Dechlorinating reagent through the cap port and mix by carefully swirling the vessel in tight circles. ACCESSORIES HI 3820-100 Spare reagents (100 tests) then the solution is alkaline and an alkalinity test must be carried out (see Hanna Alkalinity Test Kit ­ HI 3811). [. . . ]