T he design, construction and perf ormance of a remotely deployed sub mersible¯ow injection-based nutrient ( total oxidized nitrogen) sensor are described. T he sensor f eatured a custom-b uilt microcomputer and a solid-state,¯ow -through spectrophotometric detector, and the derivatization chemistry w as based on in-line copper± cadmium reduction of nitrate to nitrite, and diaz otiz ation w ith N 1N E D and sulphanilamide. T he limit of detection w as 0.0014 mg l 1 N O 3 ± N and the linear range w as 0.0014± 0.77 mg l 1 w ith a 260 ¹l sample volume and a 20 mm path length¯ow cell. R esults f rom sub mersed deployments in the T amar estuary and N orth S ea are also reported. J ournal of A utom ated M ethods & M anagement in C hemistry, V ol. 21, N o. 1 (J anuary ± F ebr uary 1999) pp. 1 ± 9
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