fast and simple online determination of cod

Gutiérrez-Capitán M, Baldi A, Gómez R, García V, Jiménez-Jorquera C, Fernández-Sánchez C (2015) Electrochemical nanocomposite-derived sensor for the analysis of chemical oxygen demand in urban wastewaters. Kim YC, Sasaki S, Yano K, Ikebukuro K, Hashimoto K, Karube I (2001) Photocatalytic sensor for the determination of chemical oxygen demand using flow injection analysis. These properties enable the Ni/α-PbO 2/CeO 2-β-PbO 2 electrode to be a promising sensor for coulometric determination of COD in industrial application.

OH on β-PbO 2, good electrical conductivity of CeO 2-doped PbO 2 layer, and the great ratio of area-to-volume ( S/ V) through elaborative cell–electrode system design.

It takes only 10~20 min to detect one sample by the well-designed electrode–cell system in this study due to the high generation rate of This means that the universal coulometric method is only decided by the total amount of COD but unrelated to the species of COD. Ag/AgCl) in aqueous solution, the anodic charge quantity is directly proportional to the amount of the organic compounds in the range of 15–1000 mg L −1, equivalent to the quantity of COD, no matter what species of the organic compounds is detected.

Results show that when the prepared Ni/α-PbO 2/CeO 2-β-PbO 2 is used to oxidize the organic compounds at a constant potential of + 1.45 V (vs. SEM and EDS disclose that the layers of α-PbO 2 and β-PbO 2 are compactly attached to the surface of the 3D structure substrate, and CeO 2 is uniformly co-deposited with β-PbO 2 onto the anode. Two layers of α-PbO 2- and CeO 2-doped β-PbO 2 were anodically deposited on Ni foam substrate successively, and the prepared Ni/α-PbO 2/CeO 2-β-PbO 2 electrode was used as a sensor to determine chemical oxygen demand (COD) by coulometric method.

Fast and simple online determination of cod