A Novel Cloud-Point Extraction Process for Preconcentrating Selected Polycyclic Aromatic Hydrocarbons in Aqueous Solution
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- 作者：Dongshun Bai ; Jingliang Li ; S. B. Chen ; and B.-H. Chen
- 刊名：Environmental Science & Technology
- 出版年：2001
- 出版时间：October 1, 2001
- 年：2001
- 卷：35
- 期：19
- 页码：3936 - 3940
- 全文大小：72K
- 年卷期：v.35,no.19(October 1, 2001)
- ISSN：1520-5851
文摘
A novel but simple cloud-point extraction (CPE) process isdeveloped to preconcentrate the trace of selectedpolycyclic aromatic hydrocarbons (PAHs) with the use ofthe readily biodegradable nonionic surfactant Tergitol 15-S-7 as extractant. The concentrations of PAHs, mixturesof naphthalene and phenanthrene as well as pyrene, in thespiked samples were determined with the new CPEprocess at ambient temperature (23 
C) followed by highperformance liquid chromatography (HPLC) with fluorescencedetection. More than 80% of phenanthrene and pyrene,respectively, and 96% of naphthalene initially present in theaqueous solutions with concentrations near or belowtheir aqueous solubilities were recovered using this newCPE process. Importantly Tergitol 15-S-7 does not give anyfluorometric signal to interfere with fluorescence detectionof PAHs in the UV range. No special washing step is,thus, required to remove surfactant before HPLC analyses.Different experimental conditions were studied. Theoptimum conditions for the preconcentration and determination of these selected PAHs at ambient temperaturehave been established as the following: (1) 3 wt % surfactant;(2) addition of 0.5 M Na2SO4; (3) 10 min for equilibrationtime; and (4) 3000 rpm for centrifugal speed with durationof 10 min.
C) followed by highperformance liquid chromatography (HPLC) with fluorescencedetection. More than 80% of phenanthrene and pyrene,respectively, and 96% of naphthalene initially present in theaqueous solutions with concentrations near or belowtheir aqueous solubilities were recovered using this newCPE process. Importantly Tergitol 15-S-7 does not give anyfluorometric signal to interfere with fluorescence detectionof PAHs in the UV range. No special washing step is,thus, required to remove surfactant before HPLC analyses.Different experimental conditions were studied. Theoptimum conditions for the preconcentration and determination of these selected PAHs at ambient temperaturehave been established as the following: (1) 3 wt % surfactant;(2) addition of 0.5 M Na2SO4; (3) 10 min for equilibrationtime; and (4) 3000 rpm for centrifugal speed with durationof 10 min.