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

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A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand. / Yao, Na; Liu, Zhuan; Chen, Ying; Zhou, Yikai; Xie, Bin.

I: Sensors, Vol. 15, Nr. 8, 2015, s. 20501-20510.

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Yao, Na ; Liu, Zhuan ; Chen, Ying ; Zhou, Yikai ; Xie, Bin. / A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand. I: Sensors. 2015 ; Vol. 15, Nr. 8. s. 20501-20510.

RIS

TY - JOUR

T1 - A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand.

AU - Yao, Na

AU - Liu, Zhuan

AU - Chen, Ying

AU - Zhou, Yikai

AU - Xie, Bin

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

U2 - 10.3390/s150820501

DO - 10.3390/s150820501

M3 - Article

VL - 15

SP - 20501

EP - 20510

JO - Sensors

JF - Sensors

SN - 1424-8220

IS - 8

ER -