Determination of pentachlorophenol and tribromophenol in sawdust by ultrasound-assisted extraction and MEKC

✍ Scribed by Claudia Mardones; Dietrich von Baer; Ariela Hidalgo; Alejandra Contreras; Carlos Sepúlveda

• Book ID: 102441401
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 362 KB
• Volume: 31
• Category: Article
• ISSN: 1615-9306
• DOI: 10.1002/jssc.200700403

✦ Synopsis

Abstract

An ultrasonic bar‐assisted extraction and CE separation procedure for the determination of pentachlorophenol (PCP) and 2,4,6‐tribromophenol (TBP) residues in sawdust was developed and applied. For this purpose, micellar electrokinetic capillary chromatography (MEKC) was used and compared with a GC/MS methodology. This methodology allowed the quantification of PCP and TBP in a concentration range of 2.5–12.0 mg/kg for TBP and 2.8–12.0 mg/kg for PCP. Different sample treatment processes were evaluated in order to extract these compounds from sawdust. Better results were obtained when the residues were extracted with ultrasound‐assisted hexane, filtered, evaporated, dissolved in Na~2~CO~3~, and injected into the CE equipment. The optimal option for GC/MS was extraction with Na~2~CO~3~ followed by a derivation using acetic anhydride and liquid–liquid extraction with hexane. This method allowed the quantification of TBP and PCP in sawdust in a concentration range of 0.19–12.00 mg/kg and 0.14–12.00 mg/kg, respectively. The CE method was compared with the GC/MS as reference method. The results were shown to be statistically similar by both methods for PCP as well as for TBP.