Journal
TALANTA
Volume 84, Issue 5, Pages 1355-1360Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2011.02.046
Keywords
Sequential injection; Phosphate determination; Ion association complex; Astra Phloxine
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A simple and fast reaction between 12-molybdophosphate heteropoly anion and the polymethine dye Astra Phloxine was used for the development of a new SIA method for the determination of orthophosphate. The suggested method has higher sensitivity and a broader calibration range than existing SIA methods. It can be used to detect phosphate in the range from 0.2 to 10 mu mol L-1 with a detection limit of 0.1 mu mol L-1 and an acceptable throughput of 20 samples h(-1). The comparably low molybdate (5.6 mmol L-1) and dye (0.1 mmol L-1) concentrations led to an improvement in the stability of the base line. Inter-day reproducibility was better than 5%, while the intra-day RSD was in the range 0.8-3.5%. The method was used for the analysis of natural water samples and phosphorus-containing chemicals having a low content of orthophosphate. (C) 2011 Elsevier B.V. All rights reserved.
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