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Flow-injection spectrophotometric determination of silicate, phosphate and arsenate with on-line column separation

✍ Scribed by Yoshio Narusawa

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 580 KB
Volume: 204
Category: Article
ISSN: 0003-2670
DOI: 10.1016/s0003-2670(00)86345-x

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✦ Synopsis

The simultaneous determination of silicate, phosphate and arsenate by using flow-injection analysis with on-line column separation is described. Determinations are based on measurement of the absorbance at 810 nm of the heteropoly blue formed with ascorbic acid as reducing reagent. Effects of flow rates, temperature of reaction coils and sample injection volumes are reported; optimum conditions are 0.25 ml min-' for the ascorbic acid stream, 95°C for the reaction coils and 300 ~1 for the injection volume. With the anion-exchange column (TSK-gel SAX), the optimal flow rate of the eluent is 0.75 ml min-'. Relative retention times depend on the concentration of the KCl/NHJEDTA eluting solution; separation and simultaneous determination of the three ions are satisfactory at around low4 mol 1-l concentrations of the three ions.

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