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Journal of Automatic Chemistry
Volume 15, Issue 5, Pages 159-166

A portable battery-powered flow injection monitor for the in situ analysis of nitrate in natural waters

1Department of Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK
2Institute qf Freshwater Ecology, River Laboratory, East Stoke, Wareham, Dorset, BH20 6BB, UK

Copyright © 1993 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.


The design and performance of a portable, automated flow injection (FI)-based photometric monitor are described. The system is controlled by an in-house microcomputer system that enables the monitor (including a solid state detector) to operate from a 12 V battery supply. The monitor uses the cadmium reduction/diazotization method to analyse for nitrate with a linear range of 0 to 12 mg l-1 and a limit of detection of 0.05 mg l-1 (NO3-N). The hardware and software design, monitor performance and results obtained during unattended operation are presented.