User manual HANNA INSTRUMENTS HI 38079

[. . . ] Instruction Manual · 1 plastic pipette (1 mL); · 1 plastic pipette (3 mL); · 1 syringe (1 mL) with tip. Note: Any damaged or defective item must be returned in its original packing materials. INSTRUCTIONS READ THE ENTIRE INSTRUCTIONS BEFORE USING THE KIT 1- Remove the cap and fill the Demineralizer Bottle with tap water. 7- Fold a filter paper disc twice as shown in the figure. HI 38079 Magnesium Test Kit for Irrigation Water SPECIFICATIONS 0 to 240 mg/L (ppm) as Mg (MR) 0 to 725 mg/L (ppm) as Mg (HR) Smallest Increment ±2. 4 mg/L as Mg (MR) ±7. 3 mg/L as Mg (HR) Analysis Method Titration Sample Size 25 mL Number of Tests 100 (average) Case Dimensions 235x175x115 mm (9. 2x6. 9x4. 5") Shipping Weight 873 g (30. 8 oz. ) Range 2- Replace the cap and shake for at least 2 minutes. The demineralized water is now ready. 8- Separate one side from the other three to form a cone. 9- Place the folded filter disc in the funnel. [. . . ] The aqueous species is often Mg2+ and it does not normally result in precipitation (as dolomite) in natural waters. Magnesium is also an important contributor to the hardness of water: when heated, magnesium salts break down forming incrustation in boilers. Moreover magnesium is necessary to plant metabolism since it is an essential constituent of organic molecules such as chlorophyll. By using the HI 38079 Hanna Test Kit, it is possible to differentiate between calcium and magnesium, since the kit determines only the magnesium ions. Note: mg/L is equivalent to ppm (parts per million). PRINTED IN ITALY 10- Pour the reacted water sample through the filter paper. 4- Add 4 drops of Buffer Reagent and swirl to mix. 11- Using the 3 mL plastic pipette, carefully transfer 3 mL of the filtered clear water sample into the small (20 mL) plastic vessel. 5- Add 1 packet of HI 38079A-0 Oxalate reagent and mix for 30 seconds by means of the plastic spoon. Some deposits may remain, but they do not affect the measurement. 12- Flip open the top of the Demineralizer Bottle cap. By gently squeezing the bottle, add demineralized water to the vessel up to the 10 mL mark. 10 mL 13- Using the 1 mL plastic pipette, add 1 mL of Buffer Solution 10. 2±0. 2 and swirl to mix. CHEMICAL REACTION The Hanna Test Kit determines Magnesium in irrigation water via a titrimetric method. Calcium, if present, is removed by prior filtration. Then the indicator chelates with magnesium to form a red colored complex. As EDTA is added, magnesium complexes with it: the reaction endpoint is indicated by a change in color of the indicator from red to blue. 6- Wait for about 5 minutes for the reaction to complete. If Calcium is present, the solution will become turbid. 09/00 14- Add 1 drop of Calmagite Indicator and swirl to mix; if magnesium is present, the solution will turn wine red. 21- Calculate the mg/L (ppm) of Magnesium in your sample as follows: REFERENCES Adaptation of Standard Methods for the Examination of Water and Wastewater, 18th edition, 1992, APA AWWA WEF. ppm of Mg = mL of titrant x 729 22- To convert the reading in mg/L of CaCO3, multiply the ppm of magnesium by 4. 114. 23- Rinse all labware with demineralized water after each analysis and shake dry. [. . . ] Read off the milliliters of titration solution from the syringe. 18- Calculate the mg/L (ppm) of Magnesium in your sample as follows: ppm of Mg = mL of titrant x 243 19- If your sample requires more than 1 mL of titrant to turn pure blue, repeat the test from step 11 using, in this case, 1 mL of filtered water sample, instead of 3 mL. 20- Follow then the instructions from step 12 to 17. [. . . ]