14
6. If the plunger tip reaches the bottom line on the Titrator scale (200 ppm)
before the color change occurs, re
fi
ll the Titrator and continue the titration.
When recording the test result, be sure to include the value of the original
amount of reagent dispensed (200 ppm).
7. To convert ppm Hardness to grains per gallon (gpg), multiply by 0.058.
Record as gpg Hardness as CaCO
3
.
gpg CaCO
3
= ppm CaCO
3
x 0.058
ANALYSIS OF HARDNESS IN SALT WATER
When waters containing very high levels of mineral salts, including sea and
estuary waters are tested the sample must be diluted before titration. This test
kit contains a calibrated pipet for performing the dilution described below.
1. Use the 0.5 mL pipet (0353) to transfer 0.5 mL of the salt water sample to
the test tube (0608).
2. Dilute to the 12.9 mL line with distilled water (a 1 to 25.8 dilution).
3. Follow Steps 2 through 5 above. Multiply the Titrator reading by 25.8.
Record as ppm Total Hardness as CaCO
3
.
