Analytical Methods
·
2022
·Vol. 14
·期 6
·661-671
·
IF 3.532
Ming Gao,Xiaofan Zhang,Sai Ma,Junxia Wang,Marcus Mammah,Liyang Du,Xuedong Wang
Herein, an ionic-liquid-based effervescence-enhanced magnetic solid-phase extraction (ILE-MSPE) approach for the extraction/concentration of organophosphorus pesticides in waters is reported with high stability and portability for rapid sample pretreatment in the field. The ionic-liquid-based magnetic effervescent tablet, composed of magnetic nanoparticles (Fe3O4), sodium carbonate (Na2CO3) as an alkaline source, and an ionic liquid ([C6MIM][PF6]), played triple functions: extractant, dispersant, and retrieving agent. Based on the one-factor-at-a-time method, the important variables for the ILE-MSPE approach were optimized as follows: as an extractant, 70 μL of [C6MIM][PF6]; molar ratio of alkaline to acidic sources (Na2CO3 : H2C4H4O6) as 1 : 1; and mass of magnetic nanoparticles (MNPs) of 30 mg. By integrating HPLC-DAD detection, the ILE-MSPE approach offered the limits of detection of 0.14–0.22 μg L−1 and fortified recoveries of 81.4–97.6% for three representative species (methamidophos, phoxim, and parathion) in water samples. The relative standard deviations were lower than 4.9% for both the intra-day and inter-day precision. Overall, the newly developed method is environmentally benign, time-saving, and feasible for outdoor application.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Liming Hu,Yazhou Cao,Jing Sun,Zhixin Chen,Mengjie Wang,Zhixiong Wu,Xueqiang Zhu,Longjie Ji,Qingbo Wen
The ozone micro–nano-bubble-enhanced oxidation (O3MNBEO) technology has shown great potential for organics-contaminated groundwater remediation in laboratory studies. However, few studies addressed its effectiveness in engineering practices as well as the impact on the groundwater environment. In this study, a field demonstration was conducted to investigate the efficiency of O3MNBEO in remediating groundwater contaminated by various organic compounds. The O3MNBEO technology exhibited high removal efficiencies ranging from 85 to 100% for benzene and significantly reduced the concentration of naphthalene, toluene, and petroleum hydrocarbons in 5-day remediation. Groundwater remediation using the O3MNBEO technology required less energy consumption and CO2 emissions. Moreover, O3MNBEO had no significant effect on groundwater pH and conductivity, and the oxidation–reduction potential (ORP) in groundwater and dissolved oxygen (DO) was substantially increased during the remediation process. The variations in ORP demonstrated a correlation with the contaminant concentration, which could serve as a potential indicator for assessing remediation progress. It is also worth noting that the presence of preferential seepage channels in the strata allows for the rapid migration of ozone MNBs, extending the reach of ozone MNBs. This study demonstrates that O3MNBEO is an efficient, practical, green, and sustainable technology that can be applied to in situ remediation of organics-contaminated groundwater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 46
·29915-29927
·
IF 4.036
Sai Ma,Ming Gao,Su Ma,Jun Wang,Yue Sun,Hanyu Wang,Huili Wang,Xuedong Wang
Conventional ionic liquids possess several disadvantages, such as high viscosity, difficult sampling/retrieval, and great loss in aqueous solution, limiting their wide applications in the pretreatment field. To solve these drawbacks, we synthesized a quaternary ammonium polymeric ionic liquid (PIL) and pressed it into an effervescent tablet for developing an effervescence-enhanced dispersive solid-phase extraction method (QAP-EDSE). The pressed effervescent tablet was composed of PIL as an extractant, tartaric acid as an acidic source, NaHCO3 as an alkaline source, and water-soluble starch as a filler, respectively. Under the CO2-driven dispersion, the QAP-EDSE method integrated rapid enrichment, extraction, and dispersion into one synchronous step. Employing the one-factor-at-a-time approach, several important variables were optimized as follows: 200 mg of P[VBTHEA]Cl as sorbent, 400 μL of acetone as elution solvent, 5 min of elution, solution pH 9.0, and 1 : 1.25 molar ratio of alkaline to acidic sources. Combining LC-DAD analysis, this proposed approach offered the limits of detection as low as 0.11–0.31 μg L−1 and satisfactory recoveries of 81.40–102.62% for five sulfonamides (SAs) in environmental waters. The lower relative standard deviations (1.9–6.7%) evidenced the higher intraday and interday experimental precision by this method. Overall, the newly developed method is environmentally benign, time-saving, and easy to operate with low detection limit and high recovery and thus shows excellent prospects in the trace-level detection of SAs in environmental waters.
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
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