Determination of n-alkanes contamination in soil samples by micro gas chromatography functionalized by multi-walled carbon nanotubes.
A new method for separation of 11 n-alkanes: octane, o-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentdecne, n-hexadecath, heptadecane, n-octadecane in soil samples was developed. Kuderna-Danish (K.D.) concentrator enrichment prior to ultrasonic extraction and the silicone chromatography column purification and with gas chromatography flame ionization detection (GC-FID) could be used for n-alkanes determination. The micro channels of open tubular column were fabricated onto a silicon wafer to replace the quartz capillary chromatographic column. The column structure and analysis parameters that affected the column separation were investigated and optimized. Under optimal conditions, the extract reagent was centrifuged and collected. A silicone chromatography column and a K.D. concentrator were used for further clean-up and enrichment. Using this method, the limits of detection (LOD) and limits of quantification (LOQ) were obtained in the range of 0.03-0.15 and 0.1-0.5 mg kg(-1) in soil samples, respectively. The relative standard deviation (RSD) was under 12%. The optimized procedure that presented good analytical performance (with recoveries ranging from 56.5% to 89.2%), was successfully applied to determine n-alkane content in farmland soil samples adjacent to a highway. The results showed that the MWCNTs-functionalized column is capable of separating the alkane contaminations with high resolution in about 3 min, which is much shorter than that of GC-MS and other conventional analytical methods, demonstrating its great potential for rapid analysis.
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Yubo
Y
Li
College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Runzhou
R
Zhang
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Tao
T
Wang
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Yonghuan
Y
Wang
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Tianbai
T
Xu
Suzhou Industrial Technology Research Institute of Zhejiang University, Suzhou 215163, China.
Lingfeng
L
Li
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Weijun
W
Zhao
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Shurong
S
Dong
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: xw224@zju.edu.cn.
Xiaozhi
X
Wang
College of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
Jikui
J
Luo
D000473:Alkanes / Q000032:analysis*; D002849:Chromatography, Gas; D004129:Dimethylpolysiloxanes / Q000032:analysis; D005410:Flame Ionization; D008401:Gas Chromatography-Mass Spectrometry; D057230:Limit of Detection; D016014:Linear Models; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis*
D000473:Alkanes; D004129:Dimethylpolysiloxanes; D037742:Nanotubes, Carbon; D012987:Soil; D012989:Soil Pollutants; C024713:n-tetradecane; C007548:n-dodecane; C013830:baysilon; C094074:tridecane; C016486:heptadecane; C022884:undecane; C022883:octadecane; C012867:decane; C017573:nonane
Micro-gas chromatography (MicroGC); Multi-walled carbon nanotubes (MWCNTs); N-alkanes; Soil samples