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Updated: Jun 28, 2026

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
Published on: September 26, 2017
Sequential automatic on-line determination of aquiculture nutrients: phosphate and nitrate
P Linares1, M D de Castro, M Valcárcel
1Department of Analytical Chemistry Faculty of Sciences University of Córdoba Córdoba E-14004 Spain.
Abstract:
A continuous-flow method for the determination of nitrate and phosphate in water is proposed. The method is based on insertion of reagents and sample solutions into a single channel through a programmable switching valve. The method depends upon heteropolyacid with phosphate and on the modified Griess reaction for nitrate, and permits the determination of PO(-3) (4) in the range 1-20 mug/ml and NO(-) (3) between 5 and 100 mug/ml, the achievable sampling frequency being 45/hour. The two analytes can be determined in N/P ratios between 0.25 and 100. The method has been applied to the determination of nitrate and phosphate in the sea-water used in fish farms.
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