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Molecules
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Environmental Samples—New Analytical Strategies
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Environmental Samples—New Analytical Strategies

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Green Chemistry".

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 2402

Special Issue Editor

Dr. Irina B. Karadjova

E-Mail Website
Guest Editor
Faculty of Chemistry and Pharmacy, University of Sofia “St. Kliment Ohridski”, 1164 Sofia, Bulgaria
Interests: antioxidant activities; green methods for extraction; element analysis; speciation analysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Green Environment concept encompasses means non-toxic chemical processes, clean energies, and green technologies, but also includes strict and reliable environmental monitoring based on efficient analytical methods and approaches. The determination of trace components in environmental samples, including the analysis of all compartments soil, water and air, in combination with requirements for accuracy and high precision of the obtained results, is a real analytical challenge. Innovations and new strategies are important features of modern analytical chemistry, including:

  • New strategies for sample preparation. Development of efficient procedures for quantitative extraction of components from various type of samples.
  • New strategies for selective separation and enrichment of micro- and nanocomponents, including new sorbents, nanocomposites and chromatographic approaches.
  • New strategies for speciation analysis, approaches for quantitative determination of chemical species of toxic elements using chromatographic and nonchromatographic methods.
  • New strategies for the optimization of instrumental parameters aiming to achieve the highest possible measurement sensitivity.

This Special Issue plans to showcase a collection of high-quality research articles focused on new developments in environmental analytical chemistry.

Researchers are welcome to contribute papers addressing all areas of analytical method development and application.

Dr. Irina B. Karadjova
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • soil
  • air
  • water
  • speciation analysis
  • chromatography
  • atomic spectrometry
  • separation
  • mass spectrometry

Published Papers (2 papers)

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Research

33 pages, 3263 KiB  
Article
Development of a Long-Term Sampling Method for Determination of NMHCs in Indoor Air
by Darya Urupina, Sylvie Traverse, Thierry Leonardis, Elise Eymard-Vernain, Julien Guilhermet, Vincent Ricard, Marie Lemoine, Camille Varlet, Remy Gillet and Nadine Locoge
Molecules 2023, 28(13), 5001; https://doi.org/10.3390/molecules28135001 - 26 Jun 2023
Viewed by 818
Abstract
Vapor intrusion is detrimental for indoor air quality. One of the most common sources of vapor intrusion is soil contaminated with petroleum hydrocarbons. To evaluate the long-term risk from individual exposure to hydrocarbons it is necessary to measure quantitively and reliably an average [...] Read more.
Vapor intrusion is detrimental for indoor air quality. One of the most common sources of vapor intrusion is soil contaminated with petroleum hydrocarbons. To evaluate the long-term risk from individual exposure to hydrocarbons it is necessary to measure quantitively and reliably an average concentration level of individual pollutants on a monthly or yearly basis. Temporal variability of vapor intrusion from hydrocarbons poses a significant challenge to determination of average exposure and there is a need for reliable long-term integrative sampling. To this end, an analytical method for determination of 10 selected nonmethane hydrocarbons (NMHCs), including hexane, heptane, octane, decane, benzene, toluene, ethyl-benzene, m,p-xylene, o-xylene, and naphthalene, sampled on active triple-bed tubes filled with Carbograph 2, Carbograph 1, and Carboxen 1003 adsorbents was developed and validated. Extensive laboratory studies proved the absence of breakthrough at 50% HR and ambient temperature for experiments lasting up to 28 days and established a safe sampling time/volume of 20 days/114 L when sampling at a low flow rate of around 4 mL min−1. In addition, the developed method includes detailed uncertainty calculations for determination of concentrations. Finally, the method was tested by measuring NMHC concentrations in indoor air at a former industrial site during a 2-month-long field campaign in Lyon. The results of the field campaign suggest that 4-week integrated concentration measurements can be achieved by using active sampling on triple-bed tubes at 4.5 mL min−1. Full article
(This article belongs to the Special Issue Environmental Samples—New Analytical Strategies)
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16 pages, 1798 KiB  
Article
Uranium Determination in Waters, Wine and Honey by Solid Phase Extraction with New Ion Imprinted Polymer
by Valentin Georgiev, Ivanka Dakova and Irina Karadjova
Molecules 2022, 27(17), 5516; https://doi.org/10.3390/molecules27175516 - 27 Aug 2022
Cited by 3 | Viewed by 1259
Abstract
An analytical method for uranium determination in waters, wine and honey was developed based on solid phase extraction (SPE) with new ion imprinted polymer. The sorbent was synthesized using 4-(2-Pyridylazo)resorcinol (PAR) as a ligand via dispersion polymerization and characterized by SEM for morphology [...] Read more.
An analytical method for uranium determination in waters, wine and honey was developed based on solid phase extraction (SPE) with new ion imprinted polymer. The sorbent was synthesized using 4-(2-Pyridylazo)resorcinol (PAR) as a ligand via dispersion polymerization and characterized by SEM for morphology and shape of polymer particles and nitrogen adsorption–desorption studies for their surface area and total pore volume. The kinetic experiments performed showed that the rate limiting step is the complexation between U(VI) ions and chelating ligand PAR incorporated in the polymer matrix. Investigations by Freundlich and Langmuir adsorption isotherm models showed that sorption process occurs as a surface monolayer on homogeneous sites. The high extraction efficiency of synthesized sorbent toward U(VI) allows its application for SPE determination of U(VI) in wine and honey without preliminary sample digestion using ICP-OES as measurement method. The recoveries achieved varied: (i) between 88 to 95% for surface and ground waters, (ii) between 90–96% for 5% aqueous solution of honey, (iii) between 86–93% for different types of wine. The validity and versatility of proposed analytical methods were confirmed by parallel measurement of U in water samples using Alpha spectrometry and U analysis in wine and honey after sample digestion and ICP-MS measurement. The analytical procedure proposed for U determination in surface waters is characterized with low limits of detection/quantification and good reproducibility ensuring its application for routine control in national monitoring of surface waters. The application of proposed method for honey and wine samples analysis provides data for U content in traditional Bulgarian products. Full article
(This article belongs to the Special Issue Environmental Samples—New Analytical Strategies)
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