Determination of phenols in environmental water samples by ionic liquid-based headspace liquid-phase microextraction coupled with high-performance liquid chromatography

• Published in: Journal of separation science 2007-01, Vol.30 (1), p.42-47
• Main Authors: Ye, Cunling, Zhou, Qingxiang, Wang, Xinming, Xiao, Junping
• Format: Article
• Language: English
• Subjects: 1-Butyl-3-methylimidazolium hexafluorophosphate; Analysis methods; Analytical chemistry; Applied sciences; Biological and medical sciences; Chemistry; Chromatographic methods and physical methods associated with chromatography; Drinking water and swimming-pool water. Desalination; Exact sciences and technology; Food industries; Fundamental and applied biological sciences. Psychology; Headspace liquid-phase microextraction; High-performance liquid chromatography; Natural water pollution; Non alcoholic beverage industries and mineral waters; Other chromatographic methods; Phenols; Pollution; Water treatment and pollution
• ISSN: 1615-9306; 1615-9314
• DOI: 10.1002/jssc.200600256

Headspace liquid‐phase microextraction (HS‐LPME) has been applied to efficient enrichment of phenols such as 2‐nitrophenol, 4‐chlorophenol, 2,4‐dichlorophenol, and 2‐naphthol from water samples based on 1‐butyl‐3‐methylimidazolium hexafluorophosphate ([C4MIM][PF6]) as an extractant. Some parameters that may influence HS‐LPME were investigated. The linear range was in the range of 0.5–100 μg/L, and the enrichment factors and repeatability (RSD, n = 6) of the proposed method were in the range of 17.2–160.7 and 5.4–8.9%, respectively. The detection limit for each analyte ranged from 0.3 to 0.5 μg/L. Complex matrices of environmental water samples had a small effect on the enrichment, and this problem could be resolved by the addition of sodium ethylene diamine tetraacetate (EDTA) into the samples. The spiked recoveries were in the range of 89.4–114.2%. All these facts demonstrated that the proposed method, with merits of low cost, simplicity, and easy operation, would be a competitive alternative procedure for the determination of such compounds at trace level.