scholarly journals Novel Zeolitic Imidazolate Frameworks Based on Magnetic Multiwalled Carbon Nanotubes for Magnetic Solid-Phase Extraction of Organochlorine Pesticides from Agricultural Irrigation Water Samples

2018 ◽  
Vol 8 (6) ◽  
pp. 959 ◽  
Author(s):  
Xiaodong Huang ◽  
Guangyang Liu ◽  
Donghui Xu ◽  
Xiaomin Xu ◽  
Lingyun Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Agricultural Irrigation ◽  
Phase Extraction ◽  
Zeolitic Imidazolate Frameworks ◽  
Multiwalled Carbon ◽  
Magnetic Solid ◽  
Magnetic Multiwalled Carbon Nanotubes

Magnetic solid-phase extraction based on magnetic amino modified multiwalled carbon nanotubes for the fast determination of seven pesticide residues in water samples

2020 ◽  
Vol 12 (21) ◽  
pp. 2747-2756 ◽  
Author(s):  
JiaNi Dong ◽  
ZhiAo Feng ◽  
SongSong Kang ◽  
Ming An ◽  
GuoDong Wu
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Phase Extraction ◽  
Multiwalled Carbon ◽  
Fast Determination ◽  
Magnetic Solid

Magnetic solid-phase extraction based on a magnetic amino modified multiwalled carbon nanotubes for the fast determination of seven pesticide residues in water samples.

scholarly journals Multi-Walled Carbon Nanotubes for Magnetic Solid-Phase Extraction of Six Heterocyclic Pesticides in Environmental Water Samples Followed by HPLC-DAD Determination

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5729
Author(s):  
Jiping Ma ◽  
Liwei Hou ◽  
Gege Wu ◽  
Liyan Wang ◽  
Xiaoyan Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Environmental Water ◽  
Phase Extraction ◽  
Multi Walled Carbon Nanotubes ◽  
Magnetic Solid ◽  
Walled Carbon Nanotubes

Magnetic multi-walled carbon nanotubes were prepared as magnetic solid-phase extraction (MSPE) adsorbent for the enrichment of six heterocyclic pesticides in environmental water samples, including imidacloprid, triadimefon, fipronil, flusilazole, chlorfenapyr and fenpyroximate. Then six heterocyclic pesticides were separated and determined by high-performance liquid chromatography-diode-array detector (HPLC-DAD). Major factors influencing MSPE efficiency, including the dose of mag-multi-walled carbon nanotubes (mag-MWCNTs), extraction time, solution pH, salt concentration, type and volume of eluent and desorption time were investigated. Under the optimized conditions, the enrichment factor of the method reached to 250. The linearity was achieved within 0.05–10.0 μg/L for imidacloprid and chlorfenapyr, 0.10–10.0 μg/L for fipronil, flusilazole, triadimefon and fenpyroximate. Limits of detection were in the range of 0.01–0.03 μg/L. Good precision at three spiked levels were 1.1–11.2% (intra-day) and 1.7–11.0% (inter-day) with relative standard deviation of peak area, respectively. The developed method was utilized to analyze tap water, river water and reservoir water samples and recoveries at three spiked concentration levels ranged from 72.2% to 107.5%. The method was proved to be a convenient, rapid and practical method for sensitive determination of heterocyclic pesticides.

Magnetic Solid-Phase Extraction of Drugs and Pesticides from Human Plasma using COOH-mMWCNTs

2020 ◽  
Author(s):  
Heesung Moon ◽  
Jiwon Park ◽  
Jinwoo Hwang ◽  
Heesun Chung
Keyword(s):  
Carbon Nanotubes ◽  
Carboxylic Acid ◽  
Solid Phase Extraction ◽  
Human Plasma ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
University Hospital ◽  
Phase Extraction ◽  
National University ◽  
Magnetic Solid

Abstract Carbon nanotubes (CNT) are useful for extracting chemical compounds due to their properties, such as surface area and the potential for chemical modification. Especially the formation of carbon nanotubes with carboxylic acid functional group makes them disperse in water-based samples and have strong interaction forces with cationizable analytes. Based on these features, carboxylic acid functionalized multi-walled carbon nanotubes (COOH-MWCNTs) have been used as extraction sorbents. CNT also can be gathered using an external magnet by forming complex with iron oxide (Fe3O4) magnetic nanoparticles (MNPs). In this study, COOH-MWCNTs with MNPs were subjected to magnetic solid phase extraction (mSPE) in order to extract the targeted substances such as diphenhydramine, doxylamine, tramadol, escitalopram, zolpidem, diphenamid, paclobutrazol, hexaconazole, cyproconazole, and mepronil from human plasma samples. The following five factors were optimized: [1] the ratio of COOH-MWCNTs to MNPs as a sorbent from 1: 1 to 1: 4; [2] sorbent amount starting from 12.5% to 75%; [3] sample pH tested pH 2 to pH 10 with 1 N hydrochloride and 1 N sodium hydroxide; [4] agitating time from 0 min to 4 min; [5] elution solvent. LOD of 10 targeted substances in human plasma were in the range of 0.1 to 0.4 mg/L. The recovery of targeted substances (except diphenamid) in human plasma was 73.06–110.28% for intra-day, 83.00–107.70% for inter-day and the precision (RSD, %) in human plasma was 0.3–13.3% for intra-day, 2.9–15.6%. The method was applied to 9 authentic biological samples from overdose patients in the emergency room of Chung-nam National University Hospital. The performance of mSPE was compared with the liquid–liquid extraction (LLE) method using ethyl acetate. The results showed that the newly developed method in this study can be used for screening analysis in forensic and clinical toxicology.

The determination of pesticides in tea samples followed by magnetic multiwalled carbon nanotube-based magnetic solid-phase extraction and ultra-high performance liquid chromatography-tandem mass spectrometry

2019 ◽  
Vol 43 (14) ◽  
pp. 5395-5403 ◽  
Author(s):  
Chu Liu ◽  
Yinghe Ji ◽  
Xu Jiang ◽  
Xucan Yuan ◽  
Xinyue Zhang ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Phase Extraction ◽  
Ultrasound Assisted Extraction ◽  
Multiwalled Carbon ◽  
Magnetic Solid ◽  
Set Up

A simple and efficient method regarding ultrasound-assisted extraction combined with magnetic solid-phase extraction (UA-MSPE) by UHPLC-MS/MS was set up for the determination of three pesticides in tea leaf samples.

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