Article

Chloride determination by ion chromatography in petroleum coke after digestion by microwave-induced combustion.

Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
Journal of Chromatography (impact factor: 4.53). 01/2009; 1213(2):249-52. DOI:10.1016/j.chroma.2008.10.079 pp.249-52
Source: PubMed

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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Keywords

2 MPa
 
50 microl
 
absorbing solution
 
absorbing solutions
 
certified reference materials
 
chloride determination
 
Combustion
 
ignition
 
Microwave-induced combustion
 
pellets
 

Juliana S F Pereira