Monitoring the TiO2-photocatalyzed destruction of aqueous environmental contaminants at parts-per-trillion levels using membrane introduction mass spectrometry (MIMS).
Membrane introduction mass spectrometry (MIMS) was used to directly monitor the TiO2/UV-photocatalyzed destruction of acetophenone, toluene, and chloroform in H2O at ppm to pptr concentrations. The instrument response time was sufficiently rapid for these environmental contaminants (1-6min) that "real-time" monitoring of their degradation was possible. This method was used to follow the loss of toluene at pptr levels and the concomitant formation of one of its primary photo-oxidation intermediates, methylphenol. These results illustrate the potential use of MIMS as a sensitive on-line measurement technique for monitoring photocatalytic destruction of trace organic contaminants in water at environmentally relevant levels.
Applied Environmental Research Laboratories, Department of Chemistry, Malaspina University-College, Nanaimo, BC, Canada.
Janet H L
JH
Nelson
Erik T
ET
Krogh
Chris G
CG
Gill
Duane A
DA
Friesen
D000098:Acetophenones / Q000032:analysis / Q000737:chemistry*; D002384:Catalysis; D002725:Chloroform / Q000032:analysis / Q000737:chemistry*; D004396:Coloring Agents / Q000032:analysis; D013058:Mass Spectrometry / Q000379:methods; D010777:Photochemistry; D017319:Photosensitizing Agents / Q000032:analysis / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012997:Solvents / Q000032:analysis / Q000737:chemistry*; D014025:Titanium / Q000032:analysis; D014050:Toluene / Q000032:analysis / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis
D000098:Acetophenones; D004396:Coloring Agents; D017319:Photosensitizing Agents; D012997:Solvents; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014050:Toluene; D002725:Chloroform; D014025:Titanium; C038699:acetophenone