期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1491, 期 -, 页码 9-15出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2017.02.034
关键词
Barley husk biomaterial carbon; Solid-phase microextraction; Gas chromatography-mass spectrometry; Pesticides; Tomato and cucumber
资金
- National Natural Science Foundation of China [31571925, 31471643, 31671930]
- Hebei Double First Class Discipline Construction Foundation for the Discipline of Food Science and Engineering of Hebei Agricultural University [2016SPGCA18]
- Natural Science Foundation of Hebei Province [B2016204136, B2016204146]
- Innovation Talents Research Foundation of Hebei Agricultural University
- Natural Science Foundation of Hebei Agricultural University [ZD201507, LG201607]
In this work, a barley husk biomaterial was successfully carbonized by hydrothermal method. The carbon had a high specific surface area and good stability. It was coated onto a stainless steel wire through sol-gel technique to prepare a solid-phase microextraction fiber for the extraction of trace levels of twelve pesticides (tsumacide, fenobucarb, indoxacarb, diethofencarb, thimet, terbufos, malathion, thiamethoxam, imidacloprid, buprofezin, acetamiprid, thiamethoxam) from vegetable samples prior to gas chromatography-mass spectrometric (GC-MS) detection. The main experimental parameters that could influence the extraction efficiency such as extraction time, extraction temperature, sample pH, sample salinity, stirring rate, desorption temperature and desorption time, were investigated. Under the optimized conditions, the linearity was observed in the range of 0.2-75.0 mu gkg(-1) for tomato samples, and 0.3-60.0 mu gkg(-1) for cucumber samples, with the correlation coefficients (r) ranging from 0.9959 to 0.9983. The limits of detection of the method were 0.01-0.05 mu gkg(-1) for tomato samples, and 0.03-0.10 mu gkg(-1) for cucumber samples. The recoveries of the analytes for the method from spiked samples were in the range of 76%-104%, and the precision, expressed as the relative standard deviations, was less than 12%. (C) 2017 Elsevier B.V. All rights reserved.
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