JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Yan-Bo Luo,Xue Li,Xing-Yi Jiang,Bao-Dong Cai,Feng-Peng Zhu,Hong-Fei Zhang,Zai-Gen Chen,Yong-Qiang Pang,Yu-Qi Feng
In this study, magnetic graphene was used as modified quick, easy, cheap, effective, rugged and safe (QuEChERS) adsorbent for the determination of organochlorine pesticide (OCPs) residues in tobacco. To achieve the optimum conditions of modified QuEChERS procedure toward target analytes, several parameters affecting the clean-up efficiency including the amount of the adsorbent and clean-up time were investigated. Under the optimized conditions, a method for the determination of 26 OCPs residues in tobacco was established by coupling the modified QuEChERS procedure to on-line gel permeation chromatography–gas chromatography–tandem mass spectrometry (on-line GPC–GC–MS 2 ). The limits of detection of proposed method for 26 OCPs residues ranged from 0.01275 to 3.150 ng/g. And good linearities of the proposed method were obtained with coefficients of determination ( R 2 ) greater than 0.9985 for all target analytes. Good reproducibility of method was obtained as intra- and inter-day precisions, the relative standard deviations were less than 11.1 and 15.0%, respectively. The apparent recoveries were in the range of 64–126% at different concentrations for real samples. Compared with the reported methods for the determination of OCPs residues in tobacco, the proposed method has the advantages of simple to operate, low cost and high clean-up ability. Finally, the method was successfully applied to the analysis of OCPs residues in real samples.
研究领域:
分析化学
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环境科学
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食品安全
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2015
·Vol. 141
·期 3
·1127-1135
·
IF 4.107
Shuaihua Zhang,Qian Yang,Zhi Li,Wenchang Wang,Chun Wang,Zhi Wang
A new solid-phase microextraction (SPME) fiber coating material, a zeolitic imidazole framework-67 (ZIF-67) templated nanoporous carbon, Co-NPC, was fabricated by one-step direct carbonization of ZIF-67 without using any other carbon precursors. The prepared Co-NPC was then coated onto a functionalized stainless steel wire by a simple physical coating method to prepare SPME fibers. By coupling the Co-NPC coated fiber based SPME with gas chromatography/micro-electron capture detection (GC/μECD), the developed method exhibited low limits of detection (0.07–0.45 ng g−1) and a wide linearity (0.30–50 ng g−1) for the determination of five organochlorine pesticides (OCPs) in vegetable samples. The method was applied to the analysis of cabbage, cucumber and celery cabbage samples, and the recoveries of the analytes were in the range of 87.9–103.9% with the relative standard deviations (RSDs) ranging from 5.1% to 10.4% (n = 5). Single fiber repeatability and fiber-to-fiber reproducibility values expressed as RSDs were in the range of 4.9–9.6% and 5.8–11.0%, respectively. The method was simple, convenient and feasible for the determination of OCPs in real samples.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2017
·Vol. 11
·期 3
·693-702
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IF 2.038
Qiu Bo,Wang Xiaochen,Li Haipu,Shu Bin,Li Shan,Yang Zhaoguang
A simple and rapid method applying acetonitrile extraction, dispersive-solid-phase extraction (d-SPE) cleanup, and dispersive liquid-liquid microextraction based on solidification of floating organic droplet (DLLME-SFO) was developed for determination of organochlorine pesticides in vegetables. In order to simplify operation, d-SPE cleanup was integrated to DLLME-SFO concentration procedure, and a protection device for glass tube was applied to achieving high-speed centrifugation. The comparison study between the integrated d-SPE and normal d-SPE showed that the former could shorten the sample preparation time without decrease of cleanup efficiency. Subsequently, the necessity of using a high-centrifugation speed (more than 8603 g) for complete separation of the d-SPE sorbents, water phase, and organic phase was confirmed through turbidity analysis. The recoveries of the proposed method ranged from 77.2 to 112.5%, and the relative standard deviations were less than 15%. The limits of detection were in the range of 0.45 ~ 1.33 μg kg −1 , while the limits of quantitation were from 1.35 to 3.99 μg kg −1 , respectively. Finally, the method was successfully applied to analyze real vegetable samples.
研究领域:
分析化学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiumin Yang,Junmin Wang,Guifen Chang,Cuihong Sun,Qiuhua Wu,Zhi Wang
Analysis of organochlorine pesticides (OCPs) residues in milk faces a significant challenge. Herein, a sea urchin structured covalent organic framework bearing boric acid groups named COF-B(OH) 2 was synthesized and applied as a coating material for solid-phase microextraction (SPME) of the OCPs in cattle’s milk. Its performance was superior to that of three commonly used commercial SPME fibers, which could be due to the coexistence of hydrogen bonding , halogen bonding, π-stacking and electrostatic interactions. Besides, the fiber coating displayed good stability and reusability. After optimization, a COF-B(OH) 2 based SPME coupled with gas chromatography-electron capture detection was established for the sensitive detection of the OCPs from milk samples. The limits of detection (S/N = 3) were between 0.04 and 1.00 μg kg −1 . Satisfactory accuracy was achieved with the method recoveries in the range of 87.5 % to 112.5 %. These results manifest the feasibility of the COF-B(OH) 2 coated fiber for the enrichment of the trace OCPs from milk samples.
研究领域:
分析化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD PROTECTION
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2021
·
IF 2.077
Lijun Xu,Meiqing Ren,Yue Cui,Xiaohuan Miao,Zhaoguang Yang,Haipu Li
ABSTRACT The present study was conducted to reveal the concentrations and patterns of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in seven species of freshwater food products ( Procambarus clarkii, Ctenopharyngodon idellus, Parabramis pekinensis, Hypophthalmichthys molitrix, Cyprinus carpio, Aristichthys nobilis, and Carassius auratus ) collected from aquaculture farms around Changsha, People's Republic of China. The OCPs and PCBs in the muscle tissue of these species were analyzed to assess the health risk associated with dietary intake. The mean concentrations of OCPs and PCBs were 6.38 to 15.90 and 3.18 to 5.12 ng g −1 wet weight, respectively. Heptachlor and δ-HCH were the main OCP contaminants in the tested samples, accounting for >74% of the total OCPs. PCB52 was the main PCB, accounting for >88% of the total PCBs. The bioaccumulation of OCPs and PCBs in these aquatic products depends upon the species. C. idellus had the highest concentrations of OCPs, and H. molitrix had the highest concentrations of PCBs. The mean lipid concentration in these freshwater species was 6.08 to 19.8% (dry weight) and was significantly correlated with the concentrations of OCPs and PCBs. The health risk from consumption of these freshwater species was assessed based on the hazard ratios and hazard quotient , and consumption of these products was determined to pose a carcinogenic risk.
研究领域:
环境科学
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毒理学
·
公共健康
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Yuanchen Chen,Chuan Yan,Zhe Sun,Yonghui Wang,Shu Tao,Guofeng Shen,Tongqin Xu,Peixue Zhou,Xiaoping Cao,Fusheng Wang,Shuqing Wang,Shoushen Hao,Hefang Yang,Hongjun Li,Quan Zhang,Weiping Liu,Meirong Zhao,Zhibin Zhang
Organochlorine pesticides (OCPs) have been used worldwide on an enormous scale over the last century but are banned globally due to environmental persistence and ecotoxicity in recent decades. The long-term effects of OCP ban for agricultural use in China since 1983 on the reproductive health of small terrestrial mammals have never been evaluated in the field. We examined the residue dynamics of OCPs and the reproductive performance of Chinese striped hamsters (Cricetulus barabensis) in North China Plain during 1983–2010 and concluded that the exposure levels of OCPs in hamsters drastically decreased from 2900 ± 740 to 25.2 ± 6.88 ng/g with an average half-life of 5.08 yrs, coinciding with the observed reproductive recovery of hamsters. The population-based reproductive performance of hamsters was significantly and negatively associated with OCP exposure levels after adjusting the contributions from climate and population density factors, indicating that the ban of OCPs has facilitated the reproductive recovery of hamsters by up to 81% contribution. Our findings suggest that the OCP ban is effective to restore reproduction of small terrestrial mammals. Integration of population biology and environmental science is essential to assess the impacts of persistent organic pollutants on ecological safety and biodiversity loss under accelerated global change.
研究领域:
生态学
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环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD PROTECTION
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2019
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IF 1.559
Xinxin Liu,Liwu Wang,Hao Li,Juxin Yin,Shaowu Lv,Ketong Zhu
ABSTRACT The purpose of this study was to investigate the status of organochlorine pesticide residues in 186 ginseng samples collected in Jilin, People's Republic of China. Based on the Chinese Pharmacopoeia 2015 method for detection of organochlorine pesticide residues in ginseng, 22 organochlorine pesticide residues were identified. Chlordane, aldrin, epichlorohydrin, and dieldrin and their isomers were not detected in ginseng from this region. Heptachlor was detected in only one ginseng sample, and the concentration did not exceed the maximum residual limit (MRL) prescribed in the Pharmacopoeia (0.05 mg/kg). Benzene hexachloride was detected in two samples, one of which was above the MRL. Hexachlorobenzene and pentachloronitrobenzene (quintozene) were found in 11.8 and 52.1% of the samples, respectively, and the residues in these samples exceeded the MRL by 4.3 and 8.6%, respectively. HIGHLIGHTS Eight organochlorine pesticides and their isomers were detected in ginseng from Jilin, China. The most common organochlorine pesticide, quintozene, was detected in 52.15% of the samples. Only 9% of ginseng samples contained organochlorine pesticides above the MRL.
研究领域:
药学
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环境科学
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产品关联
DOI
PubMed
高影响因子
TALANTA
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2014
·
IF 3.511
Zeying He,Peng Wang,Donghui Liu,Zhiqiang Zhou
In this study, a novel hydrophilic–lipophilic balanced magnetic nanoparticle , magnetic poly(divinylbenzene-co-N-vinylpyrrolidone) (HLB-MPNP) was successfully synthesized and applied for the extraction and determination of triazine and organochlorine pesticides in environmental water samples. The specific ratio of two monomers , hydrophilic N-vinylpyrrolidone and lipophilic divinylbenzene, endowed the magnetic nanoparticles with hydrophilic–lipophilic balanced character, which made it capable of extracting both polar and nonpolar analytes. The experimental parameters affecting extraction efficiency, including desorption conditions, sample pH, sample volume and extraction time were investigated and optimized. Under the optimum conditions, good linearity was obtained in the range of 0.20–10 μg L −1 for triazine herbicides and 5.0–100 ng L −1 for organochlorine pesticides, with correlation coefficients ranging from 0.994 to 0.999. The limits of determination were between 0.048 and 0.081 μg L −1 for triazine herbicides and 0.39 and 3.26 ng L −1 for organochlorine pesticides. The proposed method was successfully applied in the analysis of triazine and organochlorine pesticides in environmental water samples (ground, river and reservoir).
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 8
·1871-1885
·
IF 2.413
Xu Lijun,Miao Xiaohuan,Yang Zhaoguang,Li Haipu,Qiu Bo
Solid-phase extraction (SPE) was combined with dispersive liquid-liquid microextraction based on solidification of floating organic droplet (DLLME-SFO) as a pretreatment technique for the simultaneous analysis of 11 organochlorine pesticides (OCPs) and 5 polychlorinated biphenyls (PCBs) in fish tissue. Gas chromatography with electron capture detector was used for the identification and quantification of these compounds. In the newly developed method, the acetonitrile extractant of the fish sample was cleaned up by commercialized SPE cartridges packed with acid alumina, and then mixed with water, sodium-chloride, and n-pentadecane for the purpose of target analyte enrichment via DLLME-SFO process. Effect of the parameters including SPE packing material, amount and chemical nature of extraction solvent, water volume, and salt concentration on the signal responses were investigated, and the recoveries of this method ranged between 70.1% and 112.3% at three spiked levels under the optimized conditions. The calibration curves were found to be linear in the range of 1.56–312.5 μg L −1 , and the limits of detection ranged from 0.372 to 1.12 μg kg −1 . Comparing the other reported pretreatment method, the presented one was sensitive, time-saving, and environmentally friendly.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Shan Hua,Ji-Lai Gong,Guang-Ming Zeng,Fu-Bing Yao,Min Guo,Xiao-Ming Ou
Organochlorine pesticides (OCPs) in sediment were a potential damage for humans and ecosystems. The aim of this work was to determine the effectiveness of carbon materials remedy hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethanes (DDTs) in sediment. Two different carbon materials including activated carbon (AC) and multi-walled carbon nanotubes (MWCNTs) were used in the present research. Sediment treated with 2 wt% AC and MWCNTs after 150 d contact showed 97%, and 75% reduction for HCH, and 93% and 59% decrease for DDTs in aqueous equilibrium concentration, respectively. Similarly, the reduction efficiencies of DDT and HCH uptake by semipermeable membrane devices (SPMDs) treated with AC (MWCNTs) were 97% (75%) and 92% (63%), respectively under the identical conditions. Furthermore, for 2 wt% AC (MWCNTs) system, a reduction of XAD beads uptake up to 87% (52%) and 73% (67%) was obtained in HCH and DDT flux to overlying water in quiescent system. Adding MWCNTs to contaminated sediment did not significantly decrease aqueous equilibrium concentration and DDTs and HCH availability in SPMDs compared to AC treatment. A series of results indicated that AC had significantly higher remediation efficiency towards HCH and DDTs in sediment than MWCNTs. Additionally, the removal efficiencies of two organic pollutants improved with increasing material doses and contact times. The greater effectiveness of AC was attributed to its greater specific surface area, which was favorable for binding contaminants. These results highlighted the potential for using AC as in-situ sorbent amendments for sediment remediation.
研究领域:
环境科学
·
污染治理
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Chemistry and Pharmacy
·
2024
·
IF 5.5
Yuwei Liu,Wenxuan Li,Yuanyuan Zheng,Bowen Deng,Lei Ma,Di Chen
Organochlorine pesticides (OCPs) are known for their environmental persistence and potential health risks through consumption of contaminated agricultural products. The need for their routine monitoring and quantification is thus critically important. This study introduces a novel approach utilizing kapok fiber-derived biochar (KFBC) affixed to the inner wall of pipette tips for solid-phase microextraction (PT-SPME) to detect OCPs in beverages and herbal extracts. The KFBC was prepared through the pyrolysis of natural kapok fibers, chosen for its efficiency, economy, eco-friendliness, and notably its porous structure. The method simplifies handling by integrating the biochar into a pipette-tip extraction device, optimizing key parameters for efficient extraction. This process, requiring only 150 μL of acetonitrile , is completed in about 3 min. Coupled with gas chromatography-electron capture detection, the method demonstrates high linearity (R 2 > 0.995), sensitivity (detection limits: 0.03–0.30 ng/mL), accuracy (relative recoveries: 88.5–117.1%), and precision (relative standard deviations: 2.6–11.8%) for OCPs. Its operational ease and minimal environmental impact highlight its potential as an effective analytical technique for OCPs determination.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2015
·
IF 2.912
Chen Yang,Tianwei Lv,Hongyuan Yan,Gaochan Wu,Haonan Li
A new kind of glyoxal–urea–formaldehyde molecularly imprinted resin (GUF-MIR) was synthesized by a glyoxal–urea–formaldehyde (GUF) gel imprinting method with 4,4′-dichlorobenzhydrol as a dummy template. The obtained GUF-MIR was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) and applied as a selective adsorbent of miniaturized pipet tip solid-phase extraction (PT-SPE) for the separation and extraction of three organochlorine pesticides (dicofol (DCF), dichlorodiphenyl dichloroethane (DDD), and tetradifon) in spinach samples. The proposed pretreatment procedures of spinach samples involved only 5.0 mg of GUF-MIR, 0.7 mL of MeOH–H2O (1:1, v/v) (washing solvent), and 0.6 mL of cyclohexane–ethyl acetate (9:1, v/v) (elution solvent). In comparison with other adsorbents (such as silica gel, C18, NH2–silica gel, and neutral alumina (Al2O3–N)), GUF-MIR showed higher adsorption and purification capacity for DCF, DDD, and tetradifon in aqueous solution. The average recoveries at three spiked levels ranged from 89.1% to 101.9% with relative standard deviations (RSDs) ≤ 7.1% (n = 3). The presented GUF-MIR-PT-SPE method combines the advantages of molecularly imprinted polymers (MIPs), GUF, and PT-SPE and can be used in polar solutions with high affinity and selectivity to the analytes in complex samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）