HagenKB

Calcium Test Kit Instructions

I have lost my instructions for the use of the Calcium test kit, how do I use the test?

I have lost my instructions for the use of the Calcium test kit, how do I use the test?
The actual instructions for the test kit are as follows:

How does the Test work?

1) Take a sample of the water to be tested with the pipette. Use it to fill a clean test tube to the 5 mL line.
2) Add 7 drops of Reagent #1 to the test tube. Insert cap. Hold in place with finger and shake well to mix. Attention! Always use the cap. Avoid skin contact.
3) Shake Reagent #2 bottle vigorously (5 seconds) and then add 3 drops to the test tube. Insert cap and shake well to mix.
4) Add 1 drop of Reagent #3 to the test tube. Insert cap and shake well to mix. A pink colour should be produced. If, after 1 drop, the colour changes from light pink to violet, the calcium measure is below 20 mg/L (ppm) Ca2+.
5) If the colour remains pink, continue to add a drop at a time and shake. Count each drop and stop when the colour changes from light pink to violet. For best results, hold the test tube flat against the paper and read with a light source behind you..
6) Multiply the total number of drops by 20 to determine calcium in mg/L (ppm) as Ca2+
7) After use, rinse the test tube with fresh tap water to ensure it is clean for the next use.

CALCIUM ANALYSIS VERSUS GENERAL HARDNESS ANALYSIS
Ca2+ mg/L (ppm)
- Multiply the number of drops of Reagent #3 used by 20 to determine the calcium concentration
To determine the ration between Calcium and Magnesium
1) Calcium mg/L (Ca2+) (multiply by) X 2.5 = Calcium Hardness mg/L (CaCO3)
2) General Harness mg/L (CaCO3) (minus) - Calcium Hardness mg/L CaCO3) = Magnesium Hardness
3) Magnesium Hardness (CaCO3) (divided by) / 4.1 = Magnesium Hardness mg/L Mg2+

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