Abstract
The design, construction and performance of a remotely deployed submersible flow injection-based nutrient (total oxidized nitrogen) sensor are described. The sensor featured a custom-built microcomputer and a solid-state, flow-through spectrophotometric detector, and the derivatization chemistry was based on in-line coppercadmium reduction of nitrate to nitrite, and diazotization with N1NED and sulphanilamide. The limit of detection was 0.0014 mg l-1 NO3-N and the linear range was 0.0014- 0.77 mg l-1 with a 260 μl sample volume and a 20 mm path length flow cell. Results from submersed deployments in the Tamar estuary and North Sea are also reported.
Highlights
Nitrate is a growth-limiting micronutrient in the euphotic surface layers of sea water, where light can penetrate, and its concentration in coastal waters is regulated by advective transport of nitrate to the surface layers and assimilation by organisms, e.g. phytoplankton
Winter cooling within the water column causes vertical mixing, thereby allowing the upwelling of nutrients to enrich the surface layers, whereas in late spring and summer, nitrate concentrations are depleted by increased biological activity [1]
This paper describes the construction and field deployment of a battery-powered submersible nitrate sensor, comprising an in-house designed microcomputer and solid-state spectrophotometric detector
Summary
Nitrate is a growth-limiting micronutrient in the euphotic surface layers of sea water, where light can penetrate, and its concentration in coastal waters is regulated by advective transport of nitrate to the surface layers and assimilation by organisms, e.g. phytoplankton. This paper describes the construction and field deployment of a battery-powered submersible nitrate sensor, comprising an in-house designed microcomputer and solid-state spectrophotometric detector. The manifold, shown, had two 12 V DC peristaltic pumps (Ismatec) which delivered carrier solution, mixed colour reagent and sample/standards via switching valves and a modified six-port sample injection valve.
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