Design and evaluation of an on-line microcolumn pre-concentration technique for graphite furnace atomic absorption spectrometry

Summary A simple method is described for trace element pre-concentration on a microcolumn of inner diameter 1 mm and 25 mm length. The column packed with methacrylate gel with bound 8-quinolinol groups (Spheron Oxin) is incorporated into the tip of the sampling arm of the autosampler. The sample solution, water, eluent and air streams are switched with an eight-port valve. The flow-rate at pre-concentration is about 0.14 ml/min. After washing out the residues of the sample matrix from the column, the collected elements are eluted with 1 mol/l HNO₃ directly into the graphite tube of the atomizer. The reproducibility of the method was found to be better than 5%. The method was used for the determination of Pb in NaCl.

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Entwurf und Abschätzung einer on-line Mikrosäulen-Vorkonzentrierungstechnik für die Graphitofen-Atomabsorptionsspektrometrie