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 μl of 6 mol l −1 NH 4NO 3 as aid for ignition. Recoveries from 97 to 102% were obtained for all studied absorbing solutions (water, H 2O 2, Na 2CO 3 or (NH 4) 2CO 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 μg g −1.
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