LaMotte HARDNESS TEST KIT 4824-LT-01 - Manual (Page 3)

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 practical concentration
before titration. This test is supplied with a calibrated pipet for performing
the simple, convenient dilutions described below.
TOTAL HARDNESS DILUTION (1 TO 17.2)
1.
Use the 0.5 mL pipet (0353) to transfer 0.5 mL of the salt water to be
tested to the test tube (4488).
2. Fill tube to 10 ppm line with distilled water.
3. Follow Steps 2 through 5 under the Total Hardness test procedure.
Multiply the number of drops by 172 to obtain the test result
expressed as Total Hardness in ppm CaCO
3
.
CALCIUM HARDNESS DILUTION (1 TO 8.6)
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 (4488).
2. Fill tube to 10 ppm line with distilled water.
3. Follow Steps 2 through 4 under Calcium Hardness test procedure.
4. Multiply the number of drops by 86 to obtain the test result expressed
as Calcium Hardness in ppm CaCO
3
.
NOTE: 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
= CaCO
3
x 0.95