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Sensors 2015, 15(8), 20501-20510; doi:10.3390/s150820501

A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand

1,2,†
,
1,3,†
,
4
,
1,* and 5,*
1
Institute of Environmental Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
2
Jingzhou Central Hospital, Jingzhou 434026, China
3
Yancheng Blood Center, Yancheng 224005, China
4
Hubei Center for Disease Control and Prevention, Wuhan 430079, China
5
Pure and Applied Biochemistry, Lund University, Box 124, Lund SE-22100, Sweden
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 8 July 2015 / Revised: 4 August 2015 / Accepted: 13 August 2015 / Published: 19 August 2015
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [1475 KB, uploaded 19 August 2015]   |  

Abstract

A novel rapid methodology for determining the chemical oxygen demand (COD) based on a thermal sensor with a flow injection analysis system was proposed and experimentally validated. The ability of this sensor to detect and monitor COD was based on the degree of enthalpy increase when sodium hypochlorite reacted with the organic content in water samples. The measurement results were correlated with COD and were compared against the conventional method using potassium dichromate. The assay required only 5–7 min rather than the 2 h required for evaluation by potassium dichromate. The linear range was 5–1000 mg/L COD, and the limit of detection was very low, 0.74 mg/L COD. Moreover, this method exhibited high tolerance to chloride ions; 0.015 mol/L chloride ions had no influence on the response. Finally, the sensor was used to detect the COD of different water samples; the results were verified by the standard dichromate method. View Full-Text
Keywords: chemical oxygen demand; thermal sensor; flow injection analysis system; sodium hypochlorite chemical oxygen demand; thermal sensor; flow injection analysis system; sodium hypochlorite
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yao, N.; Liu, Z.; Chen, Y.; Zhou, Y.; Xie, B. A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand. Sensors 2015, 15, 20501-20510.

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