EXTRACTION OF MONOCARBOXYLIC-ACIDS AND DICARBOXYLIC-ACIDS FROM A CURATIVE WATER

A method for the analysis of mono- and dicarboxylic acids from water i s presented. For this purpose two techniques, a C-18 solid phase extra ction (SPE) and a combination method of liquid-liquid extraction (LLE) and aminopropyl SPE, were tested. With the combination method all ana lytes, short-chain mono- and long-chain dicarboxylic acids, could be a nalysed in one approach. The C-18 SPE was not suitable for short-chain mono- but for dicarboxylic acids. Concentrations in the investigated water ranged from 315 mg/l (butanoic acid) to 2.9 mg/l (octanoic acid) . Dicarboxylic acids were found from 5 mg/l (octanedioic acid) to 0.5 mg/l (dodecanedioic acid).