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Sequential injection determination of orthophosphate as ion associate of 12-molybdophosphate with Astra Phloxine |
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| Authors: | Khlyntseva Svitlana V Vishnikin Andriy B Al-Shwaiyat Mohammed K E A Sklenářová Hana Solich Petr Bazel Yaroslav R Andruch Vasil |
| Affiliation: | a Department of Analytical Chemistry, Faculty of Chemistry, Oles Gonchar Dnipropetrovsk National University, Gagarina 72, Dnipropetrovsk 49010, Ukraine b Department of Basic Science, Zarka University college, Al-Balqa’ Applied University, Zarka Amman Highway, Zarka 13110, Jordan c Department of Analytical Chemistry, Faculty of Pharmacy, Charles University, Heyrovského 1203, Hradec Králové 50005, Czech Republic d Department of Analytical Chemistry, Faculty of Chemistry, P.J. Šafarik University, Moyzesova 11, SK-01454 Košice, Slovak Republic |
| Abstract: | 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 μmol L−1 with a detection limit of 0.1 μmol 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. |
| Keywords: | Sequential injection Phosphate determination Ion association complex Astra Phloxine |
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