Sequential automatic on-line determination of aquiculture nutrients: phosphate and nitrateReport as inadecuate




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Journal of Automatic Chemistry - Volume 14 1992, Issue 5, Pages 173-175

Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Córdoba E-14004, Spain



Copyright © 1992 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A continuous-flow method for the determination of nitrate andphosphate in water is proposed. The method is based on insertion ofreagents and sample solutions into a single channel through aprogrammable switching valve. The method depends upon heteropolyacidwith phosphate and on the modified Griess reaction fornitrate, and permits the determination of PO43−in the range 1-20 μg-ml and NO3− between 5 and 100 μg-ml, the achievablesampling frequency being 45-hour. The two analytes can bedetermined in N-P ratios between 0.25 and 100. The method hasbeen applied to the determination of nitrate and phosphate in thesea-water used in fish farms.





Author: P. Linares, M. D. Luque de Castro, and M. Valcárcel

Source: https://www.hindawi.com/



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