A Simple, Low-Cost Double Beam Spectrophotometer for Colorimetric Detection of Nitrite in Seawater
A Simple, Low-Cost Double Beam Spectrophotometer for Colorimetric Detection of Nitrite in Seawater
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 µM.
9781424421251
862-869
Gong, Weidong
5e7fd497-7caa-4f9c-9b5e-b18e3abeecdb
Mowlem, Matt
6f633ca2-298f-48ee-a025-ce52dd62124f
Kraft, Michael
54927621-738f-4d40-af56-a027f686b59f
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
July 2009
Gong, Weidong
5e7fd497-7caa-4f9c-9b5e-b18e3abeecdb
Mowlem, Matt
6f633ca2-298f-48ee-a025-ce52dd62124f
Kraft, Michael
54927621-738f-4d40-af56-a027f686b59f
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
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), .
(doi:10.1109/JSEN.2009.2020659).
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 µM.
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Published date: July 2009
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Imported from ISI Web of Science
Organisations:
Electronics & Computer Science, National Oceanography Centre,Southampton
Identifiers
Local EPrints ID: 71835
URI: http://eprints.soton.ac.uk/id/eprint/71835
ISBN: 9781424421251
ISSN: 1530-437X
PURE UUID: 0aed91bb-fb35-43db-8994-6d5ab37cff6e
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Date deposited: 04 Jan 2010
Last modified: 14 Mar 2024 02:48
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Contributors
Author:
Matt Mowlem
Author:
Michael Kraft
Author:
Hywel Morgan
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