Evaluating fluorescence and ultraviolet photometry to assess dissolved organic matter removal during coagulation–flocculation

Abstract

Ultraviolet absorption at 254 nm (UV 254 ) and peaks (A, C and T) fluorescence intensities were evaluated to assess dissolved organic carbon (DOC) removal during coagulation-flocculation. The consistency of fluorescence data was checked to ensure that no inner filter effect, quenching or enhanced intensities affected the data. The decreases in UV 254 and peak intensities were calculated in percentage terms between raw and clarified water and compared with measured DOC removal. The results indicate that peak A, peak C, peak T and UV 254 exhibit strong linear relationships (R 2 : 0.91, 0.89, 0.92 and 0.99, respectively) with DOC removal, implying that these parameters are useful indicators of DOC removal.

Changes in the quality of river water before, during and after a major flood event associated with a La Niña cycle and treatment for drinking purposes

“…Detection was by UV absorbance (at 260 nm, HPSEC-UV) and fluorescence. For the HPSEC-fluorescence method applied, emitted light at 330 nm was measured after excitation at 280 nm (λex280 and λem 330 nm) to identify and quantify protein-like (including tryptophan-like and phenol-like) materials (Peak T) (Leenheer and Croué, 2003;Lanciné et al, 2011). For humic-like materials, λex320 and λem430 nm (Peak C1) were used, as detailed by Bridgeman et al (2011).…”