Journal
MICROCHIMICA ACTA
Volume 177, Issue 1-2, Pages 145-152Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-012-0762-0
Keywords
Dispersive liquid-liquid microextraction; High performance liquid chromatography/UV-Vis; Carbazole; Tri nitro carbazole; Tetra nitro carbazole; Water samples
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Dispersive liquid-liquid microextraction as a rapid, simple and efficient method coupled with high performance liquid chromatography-UV-Vis detection was used for sample preparation and subsequent determination of carbazole, tri nitro carbazole (TrNC) and tetra nitro carbazole in water samples. The influence of several important variables on the extraction efficiency has been evaluated. The methods works best with chloroform as an extractant and acetonitrile as the dispersive solvent. Under optimum conditions, the calibration curve is linear in the range from 0.007 to 1.75 mu g mL(-1) for TNC, 0.006 to 1.52 mu g mL(-1) for TrNC, and 0.008-2.10 mu g mL(-1) for carbazole. The limits of detection (LODs; at a signal-to-noise ratio of 3), range from 1.7 to 1.1 ng mL(-1), for TNC, TrNC and carbazole. Also, the relative standard deviations (RSD, n=6) for the extraction of TNC (at 174 ng mL(-1)), TrNC (at 151 ng mL(-1)) and carbazole (at 84 ng mL(-1)) vary between 4.1 and 5.2%. The enrichment factors range from 179 to 186. The method was successfully applied to the determination of TNC, TrNC and carbazole in environmental samples.
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