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), 862-869. (doi:10.1109/JSEN.2009.2020659).
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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.
|Subjects:||T Technology > TK Electrical engineering. Electronics Nuclear engineering
G Geography. Anthropology. Recreation > GC Oceanography
|Divisions:||University Structure - Pre August 2011 > School of Electronics and Computer Science
University Structure - Pre August 2011 > National Oceanography Centre (NERC)
|Date Deposited:||04 Jan 2010|
|Last Modified:||01 Jun 2011 12:37|
|Contributors:||Gong, Weidong (Author)
Mowlem, Matt (Author)
Kraft, Michael (Author)
Morgan, Hywel (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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