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A simple low cost double beam spectrophotometer for colorimetric detection of nitrite in seawater

Gong, Weidong, Mowlem, Matt, Kraft, Michael and Morgan, Hywel (2009) A simple low cost double beam spectrophotometer for colorimetric detection of nitrite in seawater IEEE Sensors Journal, 9, (7), pp. 862-869.

Record type: Article

Abstract

This paper reports on the optical detection system of a prototype nitrite sensor for seawater analysis. The sensor uses a colorimetric Griess reaction that produces an Azo dye with an absorption peak at 540 nm. A simple low-cost double beam spectrophotometer using a green light emitting diode (LED) light source, two integrated photo detectors and lock-in detection is described. A log-ratio amplifier is used to produce an output proportional to absorbance. The optical devices were mounted in a cast resin block to prevent shock and vibration. Experimental results show the detection system has a limit of detection of 0.1 muM.

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More information

Published date: July 2009
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 270887
URI: http://eprints.soton.ac.uk/id/eprint/270887
ISSN: 1530-437X
PURE UUID: 666ab72a-764b-41bc-9d4b-6a3d5ee48691
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 21 Apr 2010 13:34
Last modified: 18 Jul 2017 06:49

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Contributors

Author: Weidong Gong
Author: Matt Mowlem
Author: Michael Kraft
Author: Hywel Morgan ORCID iD

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