A combined photocatalytic determination system for chemical oxygen demand with a highly oxidative reagent

摘要: Abstract This study focuses on the proposal and validation of a combined photocatalytic (PC) system three-parameterized procedure for determination chemical oxygen demand (COD; PcCODcombined), with highly oxidative reagent utilized as photoelectron scavenger signal indicator. The PcCODcombined was functional combination photon-efficient thin-layer oxidation, conventional bulk-phase oxidation photocarrier-efficient high-activity reduction in one single photodigestion system, consequently, this possessed high photon-utilization efficiency, automatic stirring function satisfactory characteristics. In comparison one-parameterized procedure, introduces blank total responses two three significant analytical parameters. Under optimized pH value 3.0–4.5 rotating rate 40 rpm, representative KMnO4 species used oxidant, narrow reliable linear range 0–260 mg L−1 achieved during 10 min duration determinations. No observable interference Cl− found at concentration ion up to 2000 mg L−1. A real sample analysis indicated that measured values were all within relative deviation below 5% CODCr standard method, which further validates practical feasibility proposed system.