Bohme, C.; Schmidt, T.C.; von Low, E.; Stork, G.:

Solid-phase extraction of aminobenzoic acids and aminotoluenesulfonic acids with graphitized carbon black

In: Fresenius' Journal of Analytical Chemistry, Fresenius J. Anal. Chem., Jg. 360 (1998) ; Nr. 7-8, S. 805-807
Zeitschriftenaufsatz / Fach: Chemie
Abstract:
The extraction of amphoteric aromatic amines from water samples is difficult because of their high polarity. For the enrichment of aminobenzoic acids and aminotoluenesulfonic acids with solid-phase extraction, graphitized carbon black (GCB) was investigated. With few exceptions, the 12 analytes studied were extracted with recoveries > 60% at neutral or basic pH, whereas at pH 3 low recoveries were obtained. Addition of salt caused a decrease of about 50% in recoveries, addition of standard humic acid a decrease of about 20%. The capacity of GCB cartridges was determined with the breakthrough volume for 4-aminobenzoic acid at different concentrations to be 0.5-1% (w/w).

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