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Rapid determination of magnesium and calcium hardness in water by ion chromatography

✍ Scribed by Diane L. Smith; James S. Fritz

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
426 KB
Volume
204
Category
Article
ISSN
0003-2670

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✦ Synopsis

Magnesium( II) and calcium( II) in hard water are separated by ion chromatography and detected spectrophotometrically after a post-column reaction with arsenazo-I at pH 10. No sample dilution or pretreatment is needed, and the separation is complete in 3 min. Linear calibration plots are obtained in the 2-400 mg 1-i range. Many actual water samples from a variety of geographical locations were analyzed and the results were compared with those obtained by EDTA titration. The advantages of the chromatographic method over titration are summarized.

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