Instructions - OFI Testing Equipment, Inc.

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OFI Testing Equipment – 146-00 Instructions – Workover and Completion Fluids Test Kit Page 6 of 17 TOTAL HARDNESS TITRATION (Calcium and Magnesium) Kit Part No. 145-10 INSTRUCTIONS: This test measures the amount of soluble calcium and magnesium ions in a mud filtrate. When measured simultaneously, the result is called total hardness. The calcium ion concentration can be determined separately and when it is subtracted from the total hardness, the magnesium ion concentration can then be determined. Different buffer-indicator combinations may be used for these determinations. It is imperative however not to intermix the various buffers and indicators. Procedure: Components: #153-26 Titration Dish, polyethylene #153-28 Stirring Rod, polyethylene #153-34 Pipette, glass, 1 ml x 1/100 ml #153-40 Pipette, glass, 10 ml x 1/10 ml Reagents: #205-02 Indicator sol’n, (Calmagite), Versenate Hardness, 2 oz #205-04 *Buffer sol’n., (Ammonium), 2 oz (UN2672) #205-06 Titration sol’n., (EDTA), 40 mg/L, 2 EPM, 8 oz #205-10 Titration sol’n., (EDTA), 400 mg/L, 20 EPM, 8 oz #206-02 Deionized Water, 16 oz • Hazardous Chemical – Must be specially packaged, and hazardous shipping charges will apply. 1. Add 50 mls of deionized water to a titration dish. 2. Add 20 to 40 drops (1 – 2 mls) of hardness buffer solution to the dish. 3. Add 10 to 15 drops (0.5 – 0.75 mls) of hardness indicator solution to the mixture. 4. If a wine-red to a purple color develops, the deionized water used in step 1, contains hardness. If there is a color change, add total hardness titrating solution drop wise while stirring until the water turns to a bright blue color. 5. Using the pipette, add 1 ml of filtrate into the titration dish and stir. A wine red to purple color will again develop if calcium and/or magnesium is present in the filtrate solution. 6. Add total hardness titrating solution, stirring continuously, until the sample again turns a bright blue color. Calculation: OFITE • 11302 Steeplecrest Dr. • Houston, TX 77065 USA • Phone (832) 320-7300 • http://www.ofite.com Version 1.1 Date 03-04-03
OFI Testing Equipment – 146-00 Instructions – Workover and Completion Fluids Test Kit Page 7 of 17 epm Calcium and Magnesium = mls of Hardness Titrating solution used x 2 (If the solution strength is 1 ml = 2 epm Hardness) epm Calcium and Magnesium = mls of Hardness Titrating solution used x 20 (If the solution strength is 1 ml = 20 epm Hardness) Usually the magnesium ion content is negligible, so the total Hardness is reported as being all Calcium. Therefore: mg/L Calcium = epm Total Hardness x 20 More or less sample can be used to obtain a titration between 1 and 10 mls, in which case the results obtained above should be divided by the ml of sample used. epm = equivalent parts per million Sometimes the test is erratic at low temperatures due to the change in solubility of the ingredients. If desired, separate test may be performed for Calcium and Magnesium individually using Calcium Buffer solution and Calver II Indicator powder. See separate instructions. Various Buffer Indicator Combinations: 1. Versenate Buffer solution (#205-04, Ammonium Hydroxide, pH = 12 –13) with Versenate Indicator (#205-02, Calmagite). 2. Manver Indicator (#205-27) with Ammonium Hydroxide Buffer (#205-04, pH = 12 –13) 3. Eriochrome Black T indicator (#205-28) with Ammonium Hydroxide Buffer (#205-04 pH = 12 –13) Water Based Drilling Fluids All of these combinations may be used to determine Total Hardness. CALCIUM ANALYSIS INSTRUCTIONS When Hardness Titration solution (EDTA) is added to water or mud filtrate that contains both Calcium and Magnesium, the EDTA first combines with the Calcium. Calcium alone can be determined with EDTA when the pH of the sample is sufficiently high so that magnesium is precipitated out as the Hydroxide, and an indicator specific to Calcium is used. Several indicators will give color changes when all of the Calcium has been complexed by the EDTA at a pH in the range of 12 to 13. An end point obscured by dark organic components may be treated by oxidizing with Sodium Hypochlorite. Equipment: #153-14 Graduated Cylinder, 50 ml x 1.0 ml, glass #153-34 Pipette, 1.0 ml x 1/100 ml, glass OFITE • 11302 Steeplecrest Dr. • Houston, TX 77065 USA • Phone (832) 320-7300 • http://www.ofite.com Version 1.1 Date 03-04-03
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Instructions - OFI Testing Equipment, Inc.

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