Optimization of pressurized liquid extraction (PLE) of dioxin-furans and dioxin-like PCBs from environmental samples

Antunes, Pedro; Viana, Paula; Vinhas, Tereza; Capelo, J.L.; Rivera, J.; Gaspar, E.

doi:10.1016/j.talanta.2007.12.042

Cited by 37 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Information on the presence of the certified concentrations of PCDD/F is given in Table 1. The certified values were not available for all of the congeners presented in the material; however, the concentrations of the other congeners were determined through analysis and were in good agreement with the data obtained by Antunes et al [22]. The toxicity equivalent factors (TEF) [23] used for dioxins are also given in Table 1.…”

Section: Chemicalssupporting

confidence: 76%

Chemical Degradation of PCDD/F in Contaminated Sediment

Hrabák

Homolková

Černík

2016

Ecological Chemistry and Engineering S

View full text Add to dashboard Cite

Due to the extreme toxicity of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F), the remediation of PCDD/F aquifer source zones is greatly needed; however, it is very difficult due to their persistence and recalcitrance. The potential degradability of PCDD/F bound to a real matrix was studied in five systems: iron in a high oxidation state (ferrate), zero-valent iron nanoparticles (nZVI), palladium nanopowder (Pd), a combination of nZVI and Pd, and persulfate (PSF). The results were expressed by comparing the total toxicity of treated and untreated samples. This was done by weighting the concentrations of congeners (determined using a standardized GC/HRMS technique) by their defined toxicity equivalent factors (TEF). The results indicated that only PSF was able to significantly degrade PCDD/F. Toxicity in the system decreased by 65% after PSF treatment. Thus, we conclude that PSF may be a potential solution for in-situ remediation of soil and groundwater at PCDD/F contaminated sites.

show abstract

Section: Chemicalssupporting

confidence: 76%

Chemical Degradation of PCDD/F in Contaminated Sediment

Hrabák

Homolková

Černík

2016

Ecological Chemistry and Engineering S

View full text Add to dashboard Cite

show abstract

“…The increase in the extraction temperature may cause an opening of the cell matrix to improve the chromones yields. Meanwhile, the decrease in solvent viscosity and increase in solvent diffusivity at high temperature may lead to high extraction yields of chromones [24,25]. However, high temperature (more than 1401C) might lead to the degradation of chromones.…”

Section: Effect Of Extraction Temperaturementioning

confidence: 99%

Pressurized liquid extraction followed by LC‐ESI/MS for analysis of four chromones in Radix Saposhnikoviae

Wang

Chen

et al. 2010

J of Separation Science

View full text Add to dashboard Cite

An efficient pressurized liquid extraction (PLE) technique was employed in extracting chromones from the roots of Saposhnikovia divaricata (Radix Saposhnikoviae). Chromones were quantified and analyzed by LC-ESI/MS. The PLE procedure was optimized, validated and compared with the other conventional extraction techniques. PLE gained the best result due to the highest extraction efficiency within the shortest extraction time. The optimal conditions of PLE were employing 50% ethanol as the extraction solvent at a temperature of 140°C and an extraction pressure of 1500 psi, using one extraction cycle with a static extraction time of 8 min. A good LC separation was achieved using a Hypersil ODS2 column and methanol/water as the mobile phase at a flow rate of 0.8 mL/min. MS coupling with an ESI interface in the positive ion mode was used as the detection technique. This is the first report on combining PLE with LC-ESI/MS for the extraction and quantification of chromones in Radix Saposhnikoviae. The elaborated PLE method also provided a good alternative for the chromone extraction from other plant substances.

show abstract

“…The process takes advantage of the increasing solubility of analyte at temperatures and pressures well above the common, raising the diffusion rate and decreasing the viscosity and surface tension, so the kinetic processes for analytes desorbing from the matrix are accelerated. It has been used in environmental sample pretreatment (Antunes et al, 2008;Gabet, Miege, Bados, & Coquery, 2007;Saito et al, 2003) and other antibiotics in foodstuffs (Berrada, Borrull, Font, & Marce, 2008;Carrao-Panizzi, Favoni, & Kikuchi, 2002;Font, JuanGarcia, & Pico, 2007;Gadzała-Kopciuch, Filipiak, & Buszewski, 2008). However, in the previous work, only two papers described applicability of ASE for the extraction of tetracyclines in animal tissues (Blasco, Di Corcia, & Picó, 2009;Carretero, Blasco, & Pico, 2008).…”

Section: Introductionmentioning

confidence: 99%