A Simple, Low-Cost Double Beam Spectrophotometer for Colorimetric Detection of Nitrite in Seawater
Gong, Weidong; Mowlem, Matt; Kraft, Michael; Morgan, Hywel. 2009 A Simple, Low-Cost Double Beam Spectrophotometer for Colorimetric Detection of Nitrite in Seawater. IEEE Sensors Journal, 9 (7). 862-869. 10.1109/JSEN.2009.2020659
Full text not available from this repository.Abstract/Summary
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: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1109/JSEN.2009.2020659 |
ISBN: | 9781424421251 |
ISSN: | 1530-437X |
Date made live: | 04 Jan 2010 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/171835 |
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