LaMotte HARDNESS TEST KIT 4824-DR-LT - Manual (Page 4)

ANAL Y SIS OF HARD NESS IN SALT WA TER
When sea and estuarine waters containing very high levels of mineral salts are
to be tested, the sample must be diluted to a feasible concentration before
titration. This test is supplied with a calibrated pipet for performing the kit
dilutions described below.
TOTAL HARDNESS DILUTION (1 TO 25.8)
1.
Use the 0.5 mL pipet (0353) to transfer 0.5 mL of the salt water to be
tested to the test tube (0608).
2. Dilute to the 12.9 mL line with distilled water.
3. Follow Steps 2 through 7 under the Total Hardness Test Procedure. Multiply
Titrator reading by 25.8. Record as ppm Total Hardness as CaCO
3.
CALCIUM HARDNESS DILUTION (1 TO 12.9)
1.
Use the 0.5 mL pipet (0353) to transfer 1.0 mL (two measures) of the salt
water to be tested to the test tube (0608).
2. Dilute to the 12.9 mL line with distilled water.
3. Follow Steps 2 through 7 under Calcium Hardness test procedure. Multiply
Titrator reading by 12.9. Record as ppm Calcium Hardness as CaCO
3.
4. To convert Calcium Carbonate to Calcium Chloride, multiply by 1.11.
Record as ppm Calcium Chloride.
ppm CaCl
2
= ppm CaCO
3
x 1.11
5. To convert Calcium Carbonate to Calcium, multiply by 0.4. Record as
ppm Calcium.
ppm Ca = ppm CaCO
3
x 0.4
MAGNESIUM HARDNESS OF SALT WATER
Subtract Calcium Hardness from Total Hardness. Record as ppm Magnesium
Hardness as CaCO
3
.
Magnesium Hardness (ppm CaCO
3
) = Total Hardness - Calcium
Hardness
To convert Magnesium Hardness as CaCO
3
to Magnesium Chloride, multiply
by 0.95. Record as ppm Magnesium Chloride.
ppm MgCl
2
= ppm CaCO
3
x 0.95
To convert Magnesium Hardness to Magnesium, multiply by 0.24. Record as
ppm Magnesium.
ppm Mg = ppm CaCO
3
x 0.24
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PO Box 329 • Chestertown • Mary land • 21620 • USA
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