Measurement of chemical oxygen demand (COD) in natural water samples by flow injection ozonation chemiluminescence (FI-CL) technique.
COD determination based on ozone oxidation of alpha-naphthol combined with UV radiation (UV-O3) has been studied in the present work. Utilizing the phenomenon that luminol can be oxidized by the dissolved ozone to produce luminescence, we have established a new method of utilizing aqueous chemiluminescence to determine COD. The kinetics and mechanism of the ozonation reaction of alpha-naphthol have been investigated in order to gain a better understanding of the general applicability and limitation of the technique. Real world samples were analyzed and the results show that the relative error of COD(FI-CL) measurement for water samples was < 10%. Compared with the results of the conventional potassium permanganate method, the COD values of the FI-CL method are consistently higher (0-20% relative). The higher COD values suggest that the ozone-UV system is a more effective oxidation technique.
Jin
Baohui
B
The Key Laboratory of Analytical of Ministry of Education of China, Department of Chemistry, Xiamen University, Xiamen 361005, PR China.
He
Ying
Y
Shen
Jincan
J
Zhuang
Zhixia
Z
Wang
Xiaoru
X
Lee
Frank S C
FS
D002681:China; D017022:Flow Injection Analysis / Q000379:methods; D005618:Fresh Water / Q000737:chemistry; D007700:Kinetics; D008163:Luminescent Measurements; D009284:Naphthols / Q000737:chemistry* / Q000528:radiation effects; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis* / Q000737:chemistry; D010126:Ozone / Q000737:chemistry*; D012623:Seawater / Q000737:chemistry; D013696:Temperature; D014466:Ultraviolet Rays
D009284:Naphthols; C029350:1-naphthol; D010126:Ozone; D010100:Oxygen