Application Notes: Reflectometry – Magnesium in Drinking Water

Reflectometric determination after reaction with phthalein purple

Reagents:

Cat. No. 116124 Reflectoquant® Magnesium Test
Cat. No. 117246 Reflectometer RQflex® 20

This application note pertains to RQflex® 20 and all discontinued instruments (RQflex® 10, RQflex® plus)


Sample preparation:

The sample can be analyzed in its original form.

water pouring into glass

Analysis:
Press the reflectometer START key and simultaneously dip the test strip into the measurement sample (15 - 30 °C) for ca. 2 seconds, ensuring that both reaction zones are immersed. Allow excess liquid to run off via the long edge of the strip on to an absorbent paper towel.

Wait 15 seconds and then measure the strip in the reflectometer. The value [mg/l] will be stored automatically. (Please refer to the RQflex® operating instructions and the package insert of the Reflectoquant® Magnesium Test.)

Results - comparison with atomic absorption spectroscopy (AAS):

Sample Reflectoquant® [mg/l] AAS [mg/l]
1 7 10
2 40 38
3 7 10
4 < 5 4
5 35 35
6 30 33
7 38 38
8 44 46
9 38 34
10 33 35
11 16 17
12 28 28
13 < 5 5
14 39 40

 Materials

     
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