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A portable，cost-effective，environmental friendly and miniature photoelectrochemical system in conjunction with a ultraviolet light emitting diode（UV-LED) is developed for determination of chemical oxygen demand（COD)，namely UV-LED PeCOD. The COD value is directly quantified by measuring the electrons captured at a nanostructured TiO2 electrode during the photoelectrocatalytic degradation of organic species in wastewater.