Determination of phosphate in hydroponic nutrient solutions using flow injection potentiometry and a cobalt-wire phosphate ion-selective electrode

Roland De Marco; C Phan

doi:10.1016/S0039-9140(03)00229-7

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Determination of phosphate in hydroponic nutrient solutions using flow injection potentiometry and a cobalt-wire phosphate ion-selective electrode

Journal article

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Determination of phosphate in hydroponic nutrient solutions using flow injection potentiometry and a cobalt-wire phosphate ion-selective electrode

Roland De Marco and C Phan

Talanta, Vol.60(6), pp.1215-1221

2003

DOI: https://doi.org/10.1016/S0039-9140(03)00229-7

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Abstract

phosphate

flow injection potentiometry

ion selective electrode

The direct flow injection potentiometric (FIP) analysis of phosphate in hydroponic nutrient solution has been carried out using a cobalt-wire ion-selective electrode (ISE). Synthetic hydroponic nutrient solution, commercial hydroponic nutrient solution and working hydroponic farm nutrient solution were analysed for phosphate using the FIP technique. It is shown that FIP results compare favourably to standard methods of analysis such as spectrophotometry and indirect photometric ion-pair chromatography. Reproducible FIP response curves with a slope of -(47.57±0.03) mV per decade and intercept of -(169.7±0.1) mV were obtained for four separate calibrations in the concentration range 5.0 × 10-4-1. 0 × 10-2 M H2PO4-. Anion corrections for interferences by Cl-, NO3- and SO42- were applied to all samples using the selectivity coefficients determined independently using a fixed interference method. Nevertheless, it was found that anion corrections were not necessary, as the deviations fell within the bounds of experimental error for the cobalt-wire ISE technique (i.e.±2-5% R.S.D.). The proposed FIP method enables the direct determination of phosphate in hydroponic nutrient solutions. © 2003 Elsevier B.V. All rights reserved.

Details

Title: Determination of phosphate in hydroponic nutrient solutions using flow injection potentiometry and a cobalt-wire phosphate ion-selective electrode
Authors: Roland De Marco (Author) - Curtin University of Technology
C Phan (Author) - Curtin University of Technology
Publication details: Talanta, Vol.60(6), pp.1215-1221
Publisher: Elsevier BV
Date published: 2003
DOI: 10.1016/S0039-9140(03)00229-7
ISSN: 0039-9140
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99448616302621
Output Type: Journal article

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