Citation: REN Ke-Yu, ZHANG Wen-Lin, CAO Shu-Rui, XI Cun-Xian, WANG Guo-Min, ZHOU Zhi-Qin. Determination of Organophosphorus Pesticide Residues in Fruits and Vegetables Using Porous Carbon Nanoparticles Based on Citrus Compose[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(11): 1669-1677. doi: 10.11895/j.issn.0253-3820.170224 shu

Determination of Organophosphorus Pesticide Residues in Fruits and Vegetables Using Porous Carbon Nanoparticles Based on Citrus Compose

1.
College of Horticulture and Landscape Architecture, Southwest University, Chongqing 400716, China;
2.
Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing 400715, China;
3.
Chongqing Entry-exit Inspection and Quarantine Bureau, Chongqing 400020 China

Received Date: 12 April 2017
Revised Date: 12 August 2017

Porous carbon nanoparticles (NPC) were prepared by ZnCl₂ activation and carbonization using citrus waste as carbon source. A sample pretreatment method with NPC as dispersive solid phase extraction (d-SPE) absorbent was established for the determination of organophosphorus pesticides in fruits and vegetables by gas chromatography. The NPC was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), FT-IR spectra, Raman spectroscopy, Brunauer, Emmett and Teller surface area (BET). Those results showed that the NPC was an amorphous porous carbon material with pore size in the range of 0-15 nm. Its specific surface area and pore volume were 1243 m²/g and 1.28 cm³/g, respectively. The analysis conditions, including the amount and clean up time of adsorbent, were optimized by analysis of 14 kinds of oranophosphorus pesticides in fruits and vegetables with gas chromatography-flame photometric determination(GC-FPD). Moreover, the comparison for NPC with commercial materials of PSA, C₁₈ and GCB was investigated in this study. The results indicated that the purification time was only 2 min using 0.01 g NPC. The cost of NPC was about 25% of C₁₈, 21% of PSA and 16% of GCB. Because of the porous structure of NPC, the purification efficiency was significantly higher than the three commercial materials mentioned above. Under the optimum conditions, the calibration curves of the 14 organophosphorus pesticides were linear in the range of 0.02-1.00 mg/L with good correlation coefficients (R²>0.99) and detection limits (S/N=3) of 0.63-5.30 μg/kg. The recoveries of the pesticides at three spiked levels ranged from 71.3% to 114.7% with the relative standard deviations (RSDs) of 0.9%-12.9%. The method is simple, rapid, sensitive, and low cost, and can satisfy the requirements of detection of organophosphorus pesticide residues in fruits and vegetables, displaying a good application prospect.
- Porous carbon nanoparticles,
- Citrus waste,
- Gas chromatography,
- Organophosphorus pesticides,
- Clean-up
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1.
沈阳化工大学材料科学与工程学院沈阳 110142