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  • Title: Chloride determination by ion chromatography in petroleum coke after digestion by microwave-induced combustion.
    Author: Pereira JS, Diehl LO, Duarte FA, Santos MF, Guimarães RC, Dressler VL, Flores EM.
    Journal: J Chromatogr A; 2008 Dec 12; 1213(2):249-52. PubMed ID: 18996537.
    Abstract:
    Microwave-induced combustion was applied to petroleum coke digestion in closed vessels for further chloride determination by ion chromatography. Samples were pressed as pellets and placed on a quartz holder. Combustion was performed using oxygen pressure of 2 MPa and 50 microl of 6 moll(-1) NH(4)NO(3) as aid for ignition. Recoveries from 97 to 102% were obtained for all studied absorbing solutions (water, H(2)O(2), Na(2)CO(3) or (NH(4))(2)CO(3)). Accuracy was evaluated using certified reference materials with agreement better than 98% using water as absorbing solution with reflux step. The limit of quantification was 3.8 microg g(-1).
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