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Spectrophotometric determination of calcium with a flow injection system

✍ Scribed by G. Nakagawa; H. Wada; C. Wei

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
415 KB
Volume
145
Category
Article
ISSN
0003-2670

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✦ Synopsis

The indirect spectrophotometric determination of 0.8-7.2 ppm calcium in the presence of magnesium, phosphate and sulphate by flow injection analysis (f.i.a.) is described. The method is based on the exchange reaction between the calcium and the zinc complex of ethylene glycol-bis(2aminoethylether)tetraacetic acid (EGTA) in the presence of 4-(2pyridylazo)resorcinol (PAR): Ca + Zn(EGTA) + 2 PAR + Zn(PAR), + Ca(EGTA). A home-made and a commercial flow injection system with a sampling rate of 80 h-', are compared. Results for water samples are in good agreement with those obtained by atomic absorption spectrometry.

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