Instructions - OFI Testing Equipment, Inc.
Instructions - OFI Testing Equipment, Inc.
Instructions - OFI Testing Equipment, Inc.
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<strong>OFI</strong> <strong>Testing</strong> <strong>Equipment</strong> – 146-00 <strong>Instructions</strong> – Workover and Completion Fluids Test Kit Page 6 of 17<br />
TOTAL HARDNESS TITRATION<br />
(Calcium and Magnesium)<br />
Kit Part No. 145-10<br />
INSTRUCTIONS:<br />
This test measures the amount of soluble calcium and magnesium ions in a mud filtrate. When measured<br />
simultaneously, the result is called total hardness. The calcium ion concentration can be determined separately and<br />
when it is subtracted from the total hardness, the magnesium ion concentration can then be determined. Different<br />
buffer-indicator combinations may be used for these determinations. It is imperative however not to intermix the<br />
various buffers and indicators.<br />
Procedure:<br />
Components:<br />
#153-26 Titration Dish, polyethylene<br />
#153-28 Stirring Rod, polyethylene<br />
#153-34 Pipette, glass, 1 ml x 1/100 ml<br />
#153-40 Pipette, glass, 10 ml x 1/10 ml<br />
Reagents:<br />
#205-02 Indicator sol’n, (Calmagite), Versenate Hardness, 2 oz<br />
#205-04 *Buffer sol’n., (Ammonium), 2 oz (UN2672)<br />
#205-06 Titration sol’n., (EDTA), 40 mg/L, 2 EPM, 8 oz<br />
#205-10 Titration sol’n., (EDTA), 400 mg/L, 20 EPM, 8 oz<br />
#206-02 Deionized Water, 16 oz<br />
• Hazardous Chemical – Must be specially packaged, and hazardous shipping charges will apply.<br />
1. Add 50 mls of deionized water to a titration dish.<br />
2. Add 20 to 40 drops (1 – 2 mls) of hardness buffer solution to the dish.<br />
3. Add 10 to 15 drops (0.5 – 0.75 mls) of hardness indicator solution to the mixture.<br />
4. If a wine-red to a purple color develops, the deionized water used in step 1, contains hardness. If there is a<br />
color change, add total hardness titrating solution drop wise while stirring until the water turns to a bright<br />
blue color.<br />
5. Using the pipette, add 1 ml of filtrate into the titration dish and stir. A wine red to purple color will again<br />
develop if calcium and/or magnesium is present in the filtrate solution.<br />
6. Add total hardness titrating solution, stirring continuously, until the sample again turns a bright blue color.<br />
Calculation:<br />
<strong>OFI</strong>TE • 11302 Steeplecrest Dr. • Houston, TX 77065 USA • Phone (832) 320-7300 • http://www.ofite.com<br />
Version 1.1<br />
Date 03-04-03