60
Hardness Mg
• Fill both cuvettes up to the 10 mL mark.
• Add 1 drop of HI 93719C-0 EDTA solution to one cuvette
(# 1), replace the cap and invert the cuvette several
times to mix. This is the blank.
• Add 1 drop of HI 93719D-0 EGTA solution to the second
cuvette (# 2), replace the cap and invert the cuvette
several times to mix. This is the sample.
• Place the blank (# 1) into the holder and close the lid.
• Press the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the blank (# 1), insert the sample (# 2) into
the instrument, and close the lid.
• Press Read to start the reading. The instrument displays concentration in mg/L of magnesium
hardness, as CaCO
3
.
10 mL
10 mL
# 1
# 1
# 1
# 2
# 2
# 2
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