FORMATION AND DETERMINATION OF ALDEHYDES - OZONATION BY-PRODUCTS

Ozonation by-products are polar in nature, are found at ng l(-1) level s, and are sometimes unstable. As a results, the determination of thes e compounds using conventional analytical techniques is difficult. The objective of this study was to investigate the formation and determin ation of aldehydes -ozonation by-products. A method for the determinat ion of low molecular weight aldehydes in water using aqueous-phase der ivatization with O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine has been described. The detection limits of aldehydes with GC/ECD technique is in the (ppt) range. This method has been used to evaluate levels of a ldehydes in ozonated waters. The amount of aldehydes increased after o zonation, with formaldehyde and glioxal being the dominant products. A ldehydes formation depends on the ozone-dose: TOC ratio and quality of raw waters.