Ionic liquid-based dispersive liquid–liquid microextraction for sensitive determination of aromatic amines in environmental water

✍ Scribed by Dandan Han; Hongyuan Yan; Kyung H. Row

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 186 KB
• Volume: 34
• Category: Article
• ISSN: 1615-9306
• DOI: 10.1002/jssc.201000912

✦ Synopsis

Abstract

Ionic liquid‐based dispersive liquid–liquid microextraction was developed for the extraction and preconcentration of aromatic amine from environmental water. A suitable mixture of extraction solvent (100 μL, 1‐butyl‐3‐methylimidazolium hexafluorophoshate) and dispersive solvent (750 μL, methanol) were injected into the aqueous samples (10.00 mL), forming a cloudy solution. After centrifuging, enriched analytes in the sediment phase were determined by HPLC‐UV. The effect of various factors, such as the extraction and dispersive solvent, sample pH, extraction time and salt effect were investigated. Under optimum conditions, enrichment factors for 2‐anilinoethanol, o‐chloroaniline and 4‐bromo‐N,N‐dimethylaniline were above 50 and the limits of detection (LODs) were 0.023, 0.015 and 0.026 ng/mL, respectively. Their linear ranges were 0.8–400 ng/mL for 2‐anilinoethanol, 0.5–200 ng/mL for o‐chloroaniline and 0.4–200 ng/mL for 4‐bromo‐N,N‐dimethylaniline, respectively. Relative standard deviations (RSDs) were below 5.0%. The relative recoveries from samples of environmental water were in the range of 82.0–94.0%. Compared with other methods, dispersive liquid–liquid microextraction is simple, rapid, sensitive and economical.