A portable battery-powered flow injection monitor for the in situ analysis of nitrate in natural waters |
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| Authors: | N. J. Blundell A. Hopkins P. J. Worsfold H. Casey |
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| Affiliation: | 1. Department of Environmental Sciences, University of Plymouth, Plymouth, PL4 8AA, UK.;2. Institute qf Freshwater Ecology, River Laboratory, East Stoke, Wareham, Dorset, BH20 6BB, UK, |
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| Abstract: | 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. |
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