JBL TestLab Handbuch Seite 54

Measuring the total Mg + Ca:
1. Swill out the measuring vessel several times with the water to be tested.
2. Fill the measuring vessel to the 5ml mark with the water to be tested. We strongly recommend that the
enclosed syringe is used for exact results.
3. Add 5 drops of reagent 1 and shake to mix. Wait 1 minute.
4. Add Mg reagent 2 one drop at a time, counting the drops, and shake after each drop until the colour changes
from red via grey-brown to green. The number of the drops used multiplied by 120 gives the sum of the Mg
+ Ca content in mg/l. Example: 14 drops Mg reagent 2 = 1680 mg/l Mg + Ca
5. The magnesium content is found by subtracting the calcium content. Example: Ca 400 mg/l (test as described
below). 1680 mg/l minus 400 mg/l gives a magnesium content of 1280 mg /l.
Note: If a more precise result for the total Mg + Ca is required, 10 ml of sample water should be used in Step 1
and the number of drops in Step 4 multiplied by 60. All other steps remain as described above.
Measuring Ca:
1. Repeatedly rinse the measuring vessel with the water to be tested.
2. Fill the measuring vessel to the 5ml mark with the water to be tested. Use the enclosed syringe for exact
results.
3. Add 5 drops of reagent 1 and shake it to mix. The test result is not affected by any clouding which may occur.
Wait 1 minute.
4. Add 1 small measuring spoonful (narrow end of the enclosed double-ended spoon) of reagent 2 and shake it
until the powder has dissolved.
5. Add reagent 3 one drop at a time, counting the drops, and shake it after each drop until the colour changes
from pink via violet to blue. The number of drops needed multiplied by 20 gives the calcium content in mg/l.
Example: 12 drops of reagent 3 = 240 mg/l.
Our tip for environmentally-friendly users
All reagents for JBL test sets are available from your retailer as reasonably-priced refill packs!
Warning and safety notices:
Mg reagent 1:
Danger
H226 Flammable liquid and vapour. H314 Causes severe skin burns and eye damage.
H335 May cause respiratory irritation.
P102 Keep out of reach of children. P210 Keep away from heat/sparks/open flames/
hot surfaces. – No smoking. P261 Avoid breathing gas/mist/vapours/spray. P280 Wear
protective gloves/protective clothing/eye protection/face protection. P303+P361+P353
IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse
skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for
several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P310 Immediately call a POISON CENTER or doctor/physician.
Hazard-determining component of labelling: ammonia 5 -< 10%.
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