The University of Southampton
University of Southampton Institutional Repository

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), pp. 862-869.

Record type: Article


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.

PDF Gong_Spetrophotometer_IEEE_Sensors_2009.pdf - Other
Download (1MB)

More information

Published date: July 2009
Organisations: Nanoelectronics and Nanotechnology


Local EPrints ID: 270887
ISSN: 1530-437X
PURE UUID: 666ab72a-764b-41bc-9d4b-6a3d5ee48691
ORCID for Hywel Morgan: ORCID iD

Catalogue record

Date deposited: 21 Apr 2010 13:34
Last modified: 18 Jul 2017 06:49

Export record


Author: Weidong Gong
Author: Matt Mowlem
Author: Michael Kraft
Author: Hywel Morgan ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.