Lamotte com pany – LaMotte MAGNESIUM HARDNESS TEST KIT AB-HCM User Manual
Page 2
4.
Fill the Automatic Buret (0427) with the Hardness Titration Reagent
(4257). While gently swirling the flask, add Hardness Titration
Reagent until red color changes to blue. Record the buret reading to
the nearest 0.05 mL.
5.
Multiply buret reading by 10. Record as ppm Total Hardness as
CaCO
3
.
Total Hardness (ppm CaCO
3
) = 10 x Buret Reading
CALCIUM HARDNESS
1.
Fill graduated cylinder (0417) to the 25 mL line with sample water.
Transfer to the clean 125 mL Erlenmeyer flask (0431).
2.
Use the 1.0 mL pipet (0354) to add 2.0 mL (two measures) of
*Sodium Hydroxide Reagent w/Metal Inhibitors (4259). Mix.
3.
Add one Calcium Hardness Indicator Tablet (T-5250). Mix until
tablet disintegrates.
4.
Fill the Automatic Buret with the Hardness Titration Reagent
(4257). While gently swirling flask, add Hardness Titration Reagent
until red color changes to blue. Record the buret reading to the
nearest 0.05 mL.
5.
Multiply buret reading by 10. Record as ppm Calcium Hardness as
CaCO
3
.
Calcium Hardness (ppm CaCO
3
) = 10 x Buret Reading
To convert to calcium, multiply result by 0.4. Record as ppm
Calcium.
Calcium (ppm Ca) = 0.4 x Calcium Hardness
MAGNESIUM HARDNESS
1.
Subtract Calcium Hardness from Total Hardness. Record as ppm
Magnesium Hardness as CaCO
3
.
Magnesium Hardness (ppm CaCO
3
) =
Total Hardness - Calcium Hardness
2.
To convert to Magnesium, multiply result by 0.24. Record as ppm
Magnesium.
Magnesium (ppm Mg) = 0.24 x Magnesium Hardness
LaMOTTE COM PANY
Helping Peo ple Solve An a lyt i cal Challenges
®
PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
04.05