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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Received: 25 July 1997 / Revised: 12 September 1997 / Accepted: 13 September 1997
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Böhme, C., Schmidt, T., von Löw, E. et al. Solid-phase extraction of aminobenzoic acids and aminotoluenesulfonic acids with graphitized carbon black. Fresenius J Anal Chem 360, 805–807 (1998). https://doi.org/10.1007/s002160050813
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DOI: https://doi.org/10.1007/s002160050813