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. https://doi.org/10.1109/JSEN.2009.2020659

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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
Digital Object Identifier (DOI):	https://doi.org/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

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/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