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1.16997 Supelco

Total Hardness Test

Method: reflectometric with test strips 0.1 - 30.0 °d Reflectoquant®



packaging   50 strips in Fibre case (1.16997.0001)
storage conditions   Store at +15°C to +25°C.


Analysis Note

function control: conforms
- standard 1:
3.1 - 3.9 °d
- standard 2: 8.8 - 10.8 °d
- standard 3: 22.7 - 27.7 °d

General description

The Reflectoquant total hardness test strips can be used to measure water hardness. The hardness (total hardness) is due to its content of salts of the alkaline earth metals calcium, magnesium, strontium, and barium (“hardening constituents”, later compounds only in traces). The reaction zones of the test strip, which are impregnated with differing amounts of Titriplex III, assume a green to red color, depending on the hardness of the water sample. The color is then determined reflectometrically on the RQflex. For pre-testing a sample in an economic and quick way to check for nitrite interferences or to estimate the hardness and a possible dilution factor prior to using this quantitative method we recommend our semi-quantitative MQuant test strips for total hardness. Further quantitative determination methods can be found with our Spectroquant tests.

Safety & Documentation

Safety Information

Safety Information for this product is unavailable at this time.


Certificate of Analysis

Protocols & Articles


Analytical Method: Analytical Quality Assurance, Standard for Total Hardness

Dissolve 2.946 g of calcium nitrate tetrahydrate in a calibrated or conformity-checked 500-ml volumetric flask and make up to the mark with distilled water. The stock solution prepared according to t...

Application Notes: Reflectometry – Total Hardness in Drinking Water

Catalog No. 116997 Reflectoquant® Total Hardness Test Catalog No. 117246 Reflectometer RQflex® 20
Keywords: Complexometric titrations, Sample preparations, Titrations

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