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

Yao, Na; Liu, Zhuan; Chen, Ying; Zhou, Yikai and Xie, Bin LU (2015) In Sensors 15(8). p.20501-20510
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Sensors
volume
15
issue
8
pages
20501 - 20510
publisher
MDPI AG
external identifiers
  • pmid:26295397
  • wos:000360906500136
  • scopus:84939825578
ISSN
1424-8220
DOI
10.3390/s150820501
language
English
LU publication?
yes
id
02e9701d-a1bf-4991-986c-02f53681abde (old id 7840363)
date added to LUP
2015-09-13 20:44:00
date last changed
2017-10-22 04:01:08
@article{02e9701d-a1bf-4991-986c-02f53681abde,
  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.},
  author       = {Yao, Na and Liu, Zhuan and Chen, Ying and Zhou, Yikai and Xie, Bin},
  issn         = {1424-8220},
  language     = {eng},
  number       = {8},
  pages        = {20501--20510},
  publisher    = {MDPI AG},
  series       = {Sensors},
  title        = {A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand.},
  url          = {http://dx.doi.org/10.3390/s150820501},
  volume       = {15},
  year         = {2015},
}