MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 11
·1109-1116
·
IF 3.434
Li Chenyu,Chen Ligang,Li Wei
We report on a method for the extraction of organophosphorus pesticides (OPPs) from water samples using mixed hemimicelles and magnetic titanium dioxide nanoparticles (Fe 3 O 4 @TiO 2 ) modified by cetyltrimethylammonium. Fe 3 O 4 @TiO 2 nanoparticles were synthesized by a hydrothermal process and then characterized by scanning electron microscopy and Fourier transform IR spectrometry. The effects of the quantity of surfactant, extraction time, desorption solvent, pH value, extraction volume and reuse of the sorbent were optimized with respect to the extraction of OPPs including chlorpyrifos, dimethoate, and trichlorfon. The extraction method was applied to analyze OPPs in environmental water using HPLC along with UV detection. The method has a wide linear range (100–15,000 ng L −1 ), good linearity ( r > 0.999), and low detection limits (26–30 ng L −1 ). The enrichment factor is ~1,000. The recoveries (at spiked levels of 100, 1,000 and 10,000 ng L −1 ) are in the range of 88.5–96.7 %, and the relative standard deviations range from 2.4 % to 8.7 %.
Schematic illustration of the preparation of CTAB coated Fe 3 O 4 @TiO 2 and its application as SPE sorbent for enriching OPPs
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 38
·期 6
·996-1001
·
IF 2.737
Li Wang,Qiuxiang Yuan,Guoxi Liang,Longbiao Shi,Qian Zhan
In this study, a mixed hemimicelle solid-phase extraction method based on Fe 3 O 4 nanoparticles coated with sodium dodecyl sulfate was applied for the preconcentration and fast isolation of six fluoroquinolones in environmental water samples before high-performance liquid chromatography determination. The main factors affecting the extraction efficiency of the analytes, such as amount of surfactant, amount of Fe 3 O 4 nanoparticles, extraction time, sample volume, sample pH, ionic strength, and desorption conditions, were investigated and optimized. The method has detection limits from 0.05 to 0.1 ng/mL and good linearity ( r ≥ 09948) in the range 0.1–200 ng/mL depending on the fluoroquinolone. The enrichment factor is ∼200. The recoveries (at spiked levels of 1, 5, and 50 ng/mL) are in the range of 79–120%.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Xiaoling Yang,Kexin Qiao,Fang Liu,Xiaoling Wu,Miyi Yang,Jing Li,Haixiang Gao,Sanbing Zhang,Wenfeng zhou,Runhua Lu
In this research, a novel method using magnetic mixed hemimicelles dispersive solid-phase extraction (MMHDSPE) based on C 16 mimBr-coated attapulgite/polyaniline-polypyrrole/Fe 3 O 4 (ATP/PANI-PPY/Fe 3 O 4 ) nanocomposites were investigated for enrichment and separation of three acaricides in fruit juice. In this method, we combined the simplicity and speed of dispersive solid-phase extraction, the advantages of mixed hemimicelles and the facility of the phase separation of the magnetic nanoparticles to develop a simple, rapid, sensitive, and effective method for detecting target analytes from the juice samples. ATP/PANI-PPY/Fe 3 O 4 nanocomposites were successfully synthesized using a one-pot method. The as-prepared nanocomposite sorbents were characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental factors affecting the extraction efficiency including the sorbent type, amount of ATP/PANI-PPY/Fe 3 O 4 nanocomposites, volume of ILs , sonication time, pH, and desorption conditions were optimized. Under the optimal conditions, good linearity was observed for all target analytes, with correlation coefficients (r 2 ) ranging from 0.9994 to 0.9999; the limits of detection (LOD) were in the range of 0.16–0.57 μg L −1 , and the recoveries of analytes using the proposed method ranged between 88.67% and 95.10%. The sorbents exhibited excellent repeatability in the range of 1.83–4.24% in extracting the three target analytes. In addition, the intra-day and inter-day precision values were found to be in the range of 0.19–6.24% and 2.23–8.36%, respectively. The method was successfully applied to analyze fruit juice samples by rapid preconcentration of acaricides.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 21
·期 21
·12382-12389
·
IF 2.757
Li Chenyu,Chen Ligang,You Xiaoxiao
A novel method for the extraction of Sudan dyes including Sudan I, II, III, and IV from environmental water by magnetic titanium dioxide nanoparticles (Fe 3 O 4 @TiO 2 ) coated with sodium dodecylsulfate (SDS) as adsorbent was reported. Fe 3 O 4 @TiO 2 was synthesized by a simple method and was characterized by transmission electron microscopy, Fourier-transform infrared spectrometry, and vibrating sample magnetometer. The magnetic separation was quite efficient for the adsorption and desorption of Sudan dyes. The effect of the amount of SDS, extraction time, pH, desorption condition, maximal extraction volume, and humic acid on the extraction process were investigated. This method was employed to analyze three environmental water samples. The results demonstrated that our proposed method had wide linear range (25–5,000 ng L −1 ) with a good linearity ( R
2 > 0.999) and low detection limits (2.9–7.3 ng L −1 ). An enrichment factor of 1,000 was achieved. In all three spiked levels (25, 250, and 2,500 ng L −1 ), the recoveries of Sudan dyes were in the range of 86.9–93.6 %. The relative standard deviations obtained were ranging from 2.5 to 9.3 %. That is to say, the new method was fast and effective for the extraction of Sudan dye from environmental water.
研究领域:
分析化学
·
环境科学
·
纳米技术
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污染物检测
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样品前处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）