In terms of water hardness, the concentration of the anion hydrogen carbonate (HCO3-) is of particular importance. This concentration is referred to as carbonate hardness, transient hardness, residual alkalinity, m-value or acid capacity up to a pH value of 4.3 (KS 4.3).
The term m-value is based on the use of the indicator methyl orange. The m-value thus corresponds to the turnover point of methyl orange (pH 4.3). The use of methyl orange enables a highly accurate determination.
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DUROVAL ® KS 4,3
Product number:
400067
Test kit for the determination of the acid capacity up to pH 4,3; Ks4,3 of all natural and industrial water samples via titration with a liquid titration agent and a pipette with accurate mmol/l calibrations.
Description
Complete with measuring tube, pipette with caliitration solutionbration 0-2.0 mmol/l, special junction stopper, 8 ml indicator and 50 ml titration solution.
Analyses: approx. 100 (at an average acid capacity of 1 mmol/l)
Measuring time: approx. 2 minutes
Accuracy: 0.05 mmol/l.
€27.90*
DUROVAL® C
Product number:
400060
Test kit for the determination of the carbonate hardness or the m-value (acid capacity up to pH 4,3, Ks4,3) of all natural and industrial water samples via titration with a liquid titration agent and a pipette with accurate °dH and mmol/l calibrations.
Description
Complete with measuring tube, pipette with calibration 0-20 °dH and 0-7 mmol/l, special junction stopper, indicator and 50 ml titration solution.
Analyses: approx. 100 (at an average carbonate hardness of 10 °dH)
Measuring time: approx. 2 minutes
Accuracy: 0.5 °dH / 0.25 mmol/l.
€24.60*
DUROVAL® CPM
Product number:
400065
Test kit for the determination of the carbonate hardness, resp. the m-value (acid capacity up to pH 4.3; KS 4.3) and p-value (acid capacity up to pH 8.2; Ks 8.2) of all natural and industrial water samples via titration with a liquid titration agent and a pipette with accurate °dH and mmol/l calibrations.
Description
Complete with measuring tube, pipette with calibration 0-20 °dH and 0-7 mmol/l, special junction stopper, indicators for m- and p-value and 50 ml titration solution.
Analyses: approx. 100 (at an average carbonate hardness of 10 °dH)
Measuring time: approx. 2 minutes
Accuracy: 0.5 °dH/0.25 mmol/l
€31.00*