LaMotte AG-103 Fresh Water Aquarium - Manual (Page 13)

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 practicable concentration
before titration. This test is supplied with a calibrated pipet for performing
the simple, convenient 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 titration tube (0769).
2. Fill the tube to the 12.9 mL line with distilled water.
3. Follow steps 2 through 5 under the Total Hardness test procedure.
Multiply the resulting Titrator reading by 25.8 to obtain the test result
expressed as Total Hardness in ppm 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 titration tube (0769).
2. Fill the tube to the 12.9 mL line with distilled water.
3. Follow steps 2 through 4 under Calcium Hardness test procedure.
Multiply the resulting Titrator reading by 12.9 to obtain the test result
expressed as Calcium Hardness in ppm CaCO
3
.
4. Calcium Hardness test result may be converted to ppm Calcium
Chloride (CaCl
2
) by means of the following formula:
ppm CaCl
2
= ppm CaCO
3
x 1.11
MAGNESIUM HARDNESS OF SALT WATER
Magnesium Hardness = Total Hardness - Calcium Hardness
Magnesium Hardness test result may be converted to ppm Magnesium
Chloride (MgCl
2
) by means of the following formula:
ppm MgCl
2
= Mg Hardness as ppm CaCO
3
x 0.95
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