[en] 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.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Gong, Weidong
Mowlem, M.
Kraft, Michaël ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés
Morgan, F.
Language :
English
Title :
A simple, low-cost double beam spectrophotometer for colorimetric detection of nitrite in seawater
Publication date :
2009
Journal title :
IEEE Sensors Journal
ISSN :
1530-437X
eISSN :
1558-1748
Publisher :
Institute of Electrical and Electronics Engineers, New York, United States - New York
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