Determination of Water- and Methanol-Extractable Pentachlorophenol in Soils Using Vortex-assisted Liquid-Liquid Extraction and Gas Chromatography
文献类型： 外文期刊
作者： Yu Xiong-Sheng 1 ; Liu Yong 1 ; Lou Jun 1 ; Feng Xiao-Li 1 ; Wang Hai-Zhen 1 ; Xu Jian-Ming 1 ;
作者机构： 1.Zhejiang Univ, Coll Environm & Nat Resource Sci, Zhejiang Prov Key Lab Subtrop Soil & Plant Nutr, Hangzhou 310058, Zhejiang, Peoples R China
2.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China
关键词： Pentachlorophenol;Vortex-assistance;Liquid-liquid extraction;Water-extractable fraction;Methanol-extractable fraction;Soil contamination
期刊名称：CHINESE JOURNAL OF ANALYTICAL CHEMISTRY （ 影响因子：1.134； 五年影响因子：0.909 ）
ISSN： 0253-3820
年卷期： 2015 年 43 卷 9 期
页码：
收录情况： SCI
摘要： An analytical procedure for determination of water- and methanol-extractable pentachlorophenol (PCP) in soils was developed using vortex-assisted liquid-liquid extraction (VALLE) and gas chromatography (GC). Significant extraction parameters such as vortex speed and liquid-liquid volume ratio were optimized for extracting PCP from solution. The recovery of PCP was the highest (97.4%) with good reproducibility and a small relative standard deviation (RSD, 0.5%) when the vortex speed was at 2000 rpm. Meanwhile, when the volume ratio of derivatization solution to n-hexane was at 10: 4, the recovery of PCP was 103% with a RSD of 0.7%. The linearity of the calibration curve for PCP determination ranged from 1.25 mu g L-1 to 4000 mu g L-1, with a correlation coefficient (R-2) of 0.9999. The detection limit of PCP in water samples was below 0.2 mu g L-1 and the measuring range was relatively wide, and suitable for trace- and micro-analysis of PCP. Compared with traditional extraction methods (liquid-liquid and solid-phase), VALLE consumes less extractant, requires fewer steps, and achieves higher recovery (96.8%) and smaller RSD (3.7%). The reliability of VALLE was verified in four distinct types (paddy, red, black and alluvial) of soil samples spiked with 1 and 10 mg kg(-1) PCP. The total recoveries of PCP in the soil samples were in the range of 89.5%-98.9% by water extraction and 88.7%-98.4% by 3 consecutive extractions with methanol in a sequential procedure. The results indicated that VALLE-GC satisfied the requirements for extracting and determining water- and methanol-extractable PCP in soils polluted by PCP at varying levels.
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