Simultaneous Enrichment of Polycyclic Aromatic Hydrocarbons and Cu2+ in Water Using Tetraazacalix[2]arene[2]triazine as a Solid-Phase Extraction Selector

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• 作者：Wenjie Zhao ; Liu Yang ; Lijun He ; Shusheng Zhang
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：64
• 期：31
• 页码：6233-6239
• 全文大小：364K
• 年卷期：0
• ISSN：1520-5118

文摘

On the basis of the definite retention mechanism proven by the stationary phase for high-performance liquid chromatography, tetraazacalix[2]arene[2]triazine featuring multiple recognition sites was assessed as a solid-phase extraction (SPE) selector. The applicability of its silica support was used for the extraction of trace amounts of polycyclic aromatic hydrocarbons (PAHs) and Cu²⁺ in aqueous samples, followed by high-performance liquid chromatography fluorometric and graphite furnace atomic absorption spectrometric determination. On the basis of the π–π interaction with PAHs and the chelating interaction with Cu²⁺, the simultaneous extraction of PAHs and Cu²⁺ and stepwise elution through tuning the eluent were successfully achieved, respectively. The SPE conditions affecting the extraction efficiency were optimized, including type and concentration of organic modifier, sample solution pH, flow rate, and volume. As a result of the special adsorption and desorption mechanism, high extraction efficiency was achieved with relative recoveries of 94.3–102.4% and relative standard deviations of less than 10.5%. The limits of detection were obtained with 0.4–3.1 ng L^–1 for PAHs and 15 ng L^–1 for Cu²⁺, respectively. The method was applied to the analyses of PAHs and Cu²⁺ in Xiliu Lake water samples collected in Zhengzhou, China.