Sigma-Aldrich Total Hardness Test Method

Specific Analyte(S)

calcium, magnesium

Quality Level

100

Compatibility

for use with MQUANT^®

Detection Method

titrimetric

Storage Temp.

15-25°C

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Colorimetric & Titrimetric Test Kits

General Description

Method: titrimetric with dropping bottle MQuant^®This MQuant^®Total Hardness test (formally MColortest^®) is suitable for the titrimetric determination using a convenient dropping bottle. It can be used in:

• Groundwater, surface water, and seawater
• Waters from aquaculture
• Drinking water and mineral water
• Swimming-pool water
• Boiler water

Method
Calcium and magnesium ions react with an indicator to form a red complex compound. The indicator is released from this compound by titration with a solution of ethylenedinitrilotetraacetic acid disodium salt dihydrate (Titriplex^®III). At the titration end-point the color changes to green. The total hardness is determined from the consumption of titration solution.MCOLORTEST is a registered trademark of Merck KGaA, Darmstadt, GermanyMQUANT is a registered trademark of Merck KGaA, Darmstadt, GermanyTitriplex is a registered trademark of Merck KGaA, Darmstadt, Germany