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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Official URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumbe...
Description/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.
| Item Type: | Article |
|---|---|
| ISSN: | 1530-437 (print) |
| Related URLs: | http://ieeexplore.ieee.org/sta...r=05089573 |
| 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) |
| ePrint ID: | 71835 |
| Deposited On: | 04 Jan 2010 |
| Last Modified: | 01 Jun 2011 13:37 |
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