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Alkalinity Test

titrimetric, for use with MQUANT®

analyte chemical class(es)


Quality Level


for use with MQUANT®

detection method


storage temp.


General description

Acid capacity to pH 8.2 and pH 4.3 Method: titrimetric with titration pipette MQuant®
The alkalinity is an important parameter for the assessment of the surface-water quality and the corrosive behaviour of water as well as for water and wastewater treatment. This MQuant® Alkalinity test (formally MColortest®) is suitable for the titrimetric determination using a graduated syringe.

One sample (sample A) is titrated with hydrochloric acid against phenolphthalein until it becomes colorless (at pH 8.2), while a second sample (sample B) of the same water is titrated against a mixed indicator until its color changes to red (at pH 4.3). The values for KS8.2 and KS4.3 are determined from the corresponding consumption of titration solution.

The test measures alkalinity in e.g.
  • Groundwater and surface water, seawater
  • Drinking water and mineral water
  • Industrial water, prozess water, and wastewater
  • Boiler water
  • Aquarium water and waters from aquaculture
  • Swimming-pool water


200, 200 tests

Legal Information

MCOLORTEST is a registered trademark of Merck KGaA, Darmstadt, Germany
MQUANT is a registered trademark of Merck KGaA, Darmstadt, Germany

Signal Word


Hazard Classifications

Carc. 1B - Eye Irrit. 2 - Flam. Liq. 2 - Met. Corr. 1 - Muta. 2

Storage Class Code

3 - Flammable liquids



Certificate of Analysis

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Certificate of Quality

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