Magnetic nanoparticles: essential factors for sustainable environmental applications.

Since their introduction in the late 1970s, sequential extraction procedures have experienced a rapid increase in use. They are now applied for a large number of potentially toxic elements in a wide range of sample types. This review uses evidence from the literature to consider the usefulness and limitations of sequential extraction and thereby to assess its future role in environmental chemical analysis. It is not the intention to provide a comprehensive survey of all applications of sequential extractions or to consider the merits and disadvantages of individual schemes. These aspects have been covered adequately in other, recent reviews. This review focuses in particular on various key issues surrounding sequential extractions such as nomenclature, methodologies, presentation of data and interpretation of data, and discusses typical applications from the recent literature for which sequential extraction can provide useful and meaningful information. Also covered are emerging developments such as accelerated procedures using ultrasound- or microwave energy-assisted extractions, dynamic extractions, the use of chemometrics, the combination of sequential extraction with isotope analysis, and the extension of the approach to non-traditional analytes such as arsenic, mercury, selenium and radionuclides.

Is there a future for sequential chemical extraction

Remediation of mercury contaminated sites - A review

A comprehensive review of the single and sequential extraction schemes for metal fractionation in environmental samples such as soil and industrially contaminated soils, sewage sludge and sludge amended soils, road dust and run off, waste and miscellaneous materials along with other approaches of sequential extraction methods are being presented. A discussion on the application of chemometric methods in sequential extraction analysis is also being given. The study of single and sequential extraction methods for various reference materials are also being looked into. The review covers several aspects of the single and sequential extraction methodologies. The use of each reagents involved in these schemes are also discussed briefly. Finally the present upto date information by different workers in various fields of environmental geochemistry along with the possible future developments are also being outlined.

A Review of the Different Methods Applied in Environmental Geochemistry For Single and Sequential Extraction of Trace Elements in Soils and Related Materials

Recent progress in layered double hydroxides (LDH)-containing hybrids as adsorbents for water remediation

In the presence of iron (Fe), dissolved organic matter (DOM) may bind considerable amounts of arsenic (As), through formation of Fe-bridged As−Fe-DOM complexes and surface complexation of As on DOM-stabilized Fe-colloids (collectively referred to as As−Fe-DOM complexation). However, direct (e.g., chromatographic and spectroscopic) evidence and fundamental kinetic and stability constants have been rarely reported for this As−Fe-DOM complexation. Using a size exclusion chromatography (SEC)-UV-inductively coupled plasma mass spectrometry (ICP-MS) technique, arsenite (AsIII)-Fe-DOM complexation was investigated after adding AsIII into the priorly prepared Fe-DOM. A series of evidence, including coelution of As, Fe, and DOM from the SEC column and coretention of As, Fe, and DOM by 3 kDa MWCO centrifugal filtration membrane, demonstrated the occurrence of AsIII−Fe-DOM complexation. The kinetic data of AsIII−Fe-DOM complexation were well described by a pseudofirst order rate equation (R2 = 0.95), with the rate c...

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Complexation of Arsenite with Humic Acid in the Presence of Ferric Iron

Environmental chemistry and toxicology of mercury , Environmental chemistry and toxicology of mercury , کتابخانه مرکزی دانشگاه علوم پزشکی تهران

Guangliang Liu

Papers

Complexation of Arsenite with Humic Acid in the Presence of Ferric Iron

Environmental chemistry and toxicology of mercury

Elemental mercury: Its unique properties affect its behavior and fate in the environment.

Complexation of arsenite with dissolved organic matter: Conditional distribution coefficients and apparent stability constants

Dispersion and stability of bare hematite nanoparticles: effect of dispersion tools, nanoparticle concentration, humic acid and ionic strength