DR/2400
Hardness
Hardness_None_Other_CLC_Eng_Ody.fm Page 1 of 4
• For the most accurate magnesium test results, keep the sample temperature between 21–29 °C (70–84 °F).
• The test will detect any calcium or magnesium contamination in the mixing cylinder, measuring droppers, or sample cells. To test
cleanliness, repeat the test until results are consistent.
• Total hardness in mg/L equals mg/L Ca as CaCO
3
plus mg/L Mg as CaCO
3
.
• Remaining traces of EDTA or EGTA from previous tests will give erroneous results. Rinse sample cells thoroughly before using.
Hardness
Method 8030
Calcium and Magnesium; Calmagite Colorimetric Method
(0.07 to 4.00 mg/L Ca and Mg as CaCO
3
)
Scope and Application: For water, wastewater, and seawater
1. Touch
Hach Programs.
Select program
225 Hardness Mg.
Touch
Start.
2. Pour 100 mL of
sample into a 100-mL
graduated mixing
cylinder.
3. Add 1.0 mL of
Calcium and Magnesium
Indicator solution using a
1.0 mL measuring
dropper.
4. Stopper the cylinder
and invert it several
times.
5. Add 1.0 mL of Alkali
Solution for Calcium and
Magnesium Test using a
1.0 mL measuring
dropper.
6. Stopper the cylinder
and invert it several
times.
7. Pour 25 mL of the
solution into each of
three, round sample cells.
8. Add one drop of 1 M
EDTA Solution to the
first cell (the blank).
Swirl to mix.
Tips and Techniques
10 mL
20 mL
25 mL
Method 8030
Hach Programs
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
20 mL
25 mL
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