IC Determination of Chlorine and Bromine in Crude Oil with Sample Treatment by Combustion with Oxygen Bomb
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Graphical Abstract
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Abstract
The sample of crude oil was combusted in oxygen bomb and the chlorine and bromine were absorbed in Na2CO3-NaHCO3 solution. The contents of chlorine and bromine in the solution were determined by IC. The Dionex IonPac AS23 column was used as ion exchange column, and a mixture of 4.8 mmol·L-1 Na2CO3 and 1.0 mmol·L-1 NaHCO3 was used as eluent. Linear relationships between values of peak area and mass concentration of chlorine and bromine were obtained in the same range of 0.01-1 mg·L-1, and values of detection limit (3S/N) found were 0.3 mg·kg-1 for chlorine and 0.7 mg·kg-1 for bromine. The proposed method was applied to the analysis of sample of crude oil, giving values of RSD′s (n=6) and recovery in the ranges of 3.5%-4.2% and 91.8%-109% respectively.
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