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Spectrophotometric determination of calcium in paper machine white water by sequential injection analysis

✍ Scribed by Johan Nyman; Ari Ivaska

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
639 KB
Volume
308
Category
Article
ISSN
0003-2670

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✦ Synopsis

A sequential injection analysis method is developed for the determination of calcium in white water of a paper machine.

The determination is based bn the formation of a coloured complex between Ca*+ and o-cresolphthalein complexone, which is monitored spectrophotometrically.

Parameters of the method were optimized in order to give a working range as broad as possible. A working range of S-500 mg I-' Ca*+ was achieved with a sample volume of 30 ~1. Preliminary tests of the method were conducted using off-line samples from different paper mills in Finland. The method developed was also tested in an on-line application at a paper mill which produces wood-containing paper grades.

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