Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7771
Title: An optical biosensor for multi-sample determination of biochemical oxygen demand (BOD)
Authors: Kwok, NY
Dong, S
Lo, W 
Wong, KY 
Keywords: BOD sensor
Multi-sample
Optical
Sol-gel
Issue Date: 2005
Publisher: Elsevier
Source: Sensors and actuators. B, Chemical, 2005, v. 110, no. 2, p. 289-298 How to cite?
Journal: Sensors and actuators. B, Chemical 
Abstract: An optical biosensor for parallel multi-sample determination of biochemical oxygen demand (BOD) in wastewater samples has been developed. The biosensor monitors the dissolved oxygen (DO) concentration in water through an oxygen sensing film immobilized on the bottom of glass sample vials. The oxygen sensing film contains the tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dye (Ru(dpp)) the luminescence intensity of which varies with oxygen concentration. A computer-controlled moving optrode head with four blue light emitting diodes (LEDs) was scanned sequentially under each sample vial. The luminescence signal was collected by an optical cable and transmitted to a photomultiplier tube (PMT) and processed by a microcomputer. The microbial samples (activated sludge and Bacillus subtilis were immobilized in a sol-gel composite material of silica and poly(vinyl alcohol)-grafted-poly(vinylpyridine) on the oxygen sensing film. The performance of the microbial film as a function of cell loading, thickness, temperature and pH and in the presence of heavy metals as well as its stability and service life have been investigated. The BOD value was determined from the rate of oxygen consumption by the microorganisms in the first 20 min. The BOD values obtained from this biosensor correlates well with the results of the conventional 5-day BOD test.
URI: http://hdl.handle.net/10397/7771
ISSN: 0925-4005
EISSN: 1873-3077
DOI: 10.1016/j.snb.2005.02.007
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

51
Last Week
0
Last month
1
Citations as of Oct 10, 2017

WEB OF SCIENCETM
Citations

46
Last Week
0
Last month
1
Citations as of Sep 30, 2017

Page view(s)

42
Last Week
2
Last month
Checked on Oct 15, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.