Influence of High Salinity on the Degradation of Humic Acid by UV₂₅₄ and H₂O₂/UV₂₅₄

摘要

Humic substances constitute an important part of persistent organic matter in natural waters. This study focuses on standard humic acid (HA) degradation by UV irradiation alone and combined with H₂O₂. At high concentration, chloride is known to be a radical scavenger that could affect humic acid degradation by photochemical processes. The influences of pH, NaCl presence and H₂O₂ concentration are discussed here. UV irradiation shows a slight HA degradation but addition of H₂O₂ greatly improved aromatics removal. Higher the pH and higher the H₂O₂ dose, more HA is degraded. In chloride ion presence, HA degradation is reduced that confirms chloride scavenging effect. Also, high ionic strength impacts on HA molecular configuration limiting its degradation.View full textDownload full textKeywordsUltraviolet Radiation, Hydrogen Peroxide, Humic Acids, Salinity, ChlorideRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/01919512.2012.649998