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Sensors 2014, 14(6), 9949-9960; doi:10.3390/s140609949

Rapid Determination of the Chemical Oxygen Demand of Water Using a Thermal Biosensor

Institute of Environmental Medicine, Tongji Medical College, Huazhong University of Science and Technology, 430030 Wuhan, China
Author to whom correspondence should be addressed.
Received: 23 April 2014 / Revised: 12 May 2014 / Accepted: 28 May 2014 / Published: 6 June 2014
(This article belongs to the Special Issue Sensors for Bioprocess Monitoring and Control)
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In this paper we describe a thermal biosensor with a flow injection analysis system for the determination of the chemical oxygen demand (COD) of water samples. Glucose solutions of different concentrations and actual water samples were tested, and their COD values were determined by measuring the heat generated when the samples passed through a column containing periodic acid. The biosensor exhibited a large linear range (5 to 3000 mg/L) and a low detection limit (1.84 mg/L). It could tolerate the presence of chloride ions in concentrations of 0.015 M without requiring a masking agent. The sensor was successfully used for detecting the COD values of actual samples. The COD values of water samples from various sources were correlated with those obtained by the standard dichromate method; the linear regression coefficient was found to be 0.996. The sensor is environmentally friendly, economical, and highly stable, and exhibits good reproducibility and accuracy. In addition, its response time is short, and there is no danger of hazardous emissions or external contamination. Finally, the samples to be tested do not have to be pretreated. These results suggest that the biosensor is suitable for the continuous monitoring of the COD values of actual wastewater samples. View Full-Text
Keywords: chemical oxygen demand (COD); thermal biosensor; flow injection analysis system; periodic acid chemical oxygen demand (COD); thermal biosensor; flow injection analysis system; periodic acid

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Yao, N.; Wang, J.; Zhou, Y. Rapid Determination of the Chemical Oxygen Demand of Water Using a Thermal Biosensor. Sensors 2014, 14, 9949-9960.

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