Development of a Method to Identify Keto Acids in Ozonated Fulvic Acid Solutions

✍ Scribed by Xie, Yuefeng; Reckhow, David A.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 297 KB
• Volume: 32
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/(sici)1096-9888(199701)32:1<99::aid-jms457>3.0.co;2-5

✦ Synopsis

A gas chromatographic-mass spectrometric method, combining an O-(2,3,4,5,6-pentaÑuorobenzyl)hydroxylaminediazomethane double derivatization, was developed to identify major keto acids in ozonated fulvic acid solutions. Three keto acids, glyoxylic, pyruvic, and ketomalonic acid, four aldehydes and two analytical artifacts were identi-Ðed. The detailed mass spectra, obtained in both electron impact and positive chemical ionization modes, and their fragment assignments are presented. Owing to the similarity of their electron impact mass spectra, electron impact mass spectra along with positive chemical ionization mass spectra are needed to identify these keto acids reliably. The e †ects of the formation of keto acids on water quality are also discussed.