Sequential Extraction of Proteins by Chemical Reagents

The most essential scientifific and practical task in the area of ecological safety of pipelines operation is the development and improvement of methods of purifification and restoration of oil-contaminated soils. One of the most effificient and cost effective methods is electrochemical purifification, that does not require the use of expensive chemical reagents and soil excavation. However, the consideration of non-uniform contamination of various soil sections is required. The article examines the features of the organization and technological infrastructure for electrochemical purifification of non-uniformly contaminated soils when using a single electrical energy source, a method for calculating the design parameters of the corresponding installation is proposed. Effificient purifification of non-uniformly contaminated soil when using a specifified voltage is possible through the use of different-sized electrodes. For each soil type, the amount of transmitted electric charge required for soil purifification is determined by the concentration of the contaminant. Allocation of cathodes and anodes as parallel batteries and their connection using individual buses is an effective and energy-effificient solution, since an almost-uniform electric fifield is created in an inter-electrode space, thus allowing the reduction of the interelectrode resistance of the medium.

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Sequential extraction procedure to obtain the composition of terrigenous detritus in marine sediments

MethodsX ◽

10.1016/j.mex.2020.100888 ◽

2020 ◽

Vol 7 ◽

pp. 100888

Author(s):

Margit H. Simon ◽

Daniel P. Babin ◽

Steven L. Goldstein ◽

Merry Yue Cai ◽

Tanzhuo Liu ◽

...

Keyword(s):

Sequential Extraction ◽

Marine Sediments ◽

Extraction Procedure ◽

Sequential Extraction Procedure

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The Use of a Sequential Extraction Technique to Characterize Soil Trace Evidence Recovered from a Spade in a Murder Case in Brazil*

Journal of Forensic Sciences ◽

10.1111/1556-4029.14491 ◽

2020 ◽

Vol 65 (6) ◽

pp. 1921-1934 ◽

Cited By ~ 1

Author(s):

Samara Alves Testoni ◽

Vander Freitas Melo ◽

Lorna Anne Dawson ◽

Joice Malakoski ◽

Edimar Cunico ◽

...

Keyword(s):

Sequential Extraction ◽

Extraction Technique ◽

Trace Evidence

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Determination of the amount of volatile acids in oxidized wines and neutralization of these by using chemical reagents and biological materials

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-01339-7 ◽

2021 ◽

Author(s):

Ljiljana M. Babincev ◽

Srđan Jović

Keyword(s):

Biological Materials ◽

Chemical Reagents

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Analysis of the Pyrolytic Behaviour of Birch, Maple, and Rowan Leaves

Energies ◽

10.3390/en14082091 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2091

Author(s):

Valentina Zubkova ◽

Andrzej Strojwas ◽

Marcin Bielecki

Keyword(s):

Combustion Products ◽

Carbonyl Groups ◽

Chemical Parameters ◽

Chemical Reagents ◽

Urban Greenery ◽

Volatile Products ◽

Different Types ◽

Ft Ir ◽

Xrd Techniques ◽

Lower Contribution

A research study was conducted on the thermal behaviour of leaves of urban greenery (birch, maple, and rowan) and the products of their pyrolysis and extraction as assisted by microwaves. The obtained products of pyrolysis and extraction were investigated with the use of FT-IR and UV spectroscopies and XRD techniques. A contractive analysis of samples of chars, condensates, after-extraction residue, and extracts showed that the changes in structural-chemical parameters of leaves of different types of trees during pyrolysis and extraction take place in distinct ways. About 22% of material was removed from birch leaves during extraction, and more than 17% of material was extracted from maple and rowan leaves. It was determined that, during pyrolysis of after-extraction residue of leaves, many fewer PAH compounds with carbonyl groups along with alcohols and phenols are emitted than during pyrolysis of non-extracted leaves. Taking into account that pyrolysis is the first stage of combustion, a decrease in the amount of dangerous compounds in the volatile products of pyrolysis leads to a lower contribution of such compounds in combustion products. This indicates that leaves of urban greenery can be subjected to combustion after extraction, and the obtained extracts can be used as a source of phytochemicals and chemical reagents.

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An Assessment of Heavy Metal Contamination in the Nakdong River Around the Weir

Water ◽

10.3390/w13050684 ◽

2021 ◽

Vol 13 (5) ◽

pp. 684

Author(s):

Hee Won Son ◽

Sun Hee Shim ◽

Haeseong Oh ◽

Jung Hyun Choi

Keyword(s):

Heavy Metals ◽

Sequential Extraction ◽

Environmental Protection Agency ◽

Heavy Metal Contamination ◽

Environmental Research ◽

Residual Fraction ◽

Nakdong River ◽

Risk Assessment Code ◽

The Nakdong River ◽

Reducible Fraction

In this study, the concentrations and characteristics of copper (Cu), zinc (Zn), and lead (Pb) contamination in sediment samples were investigated using aqua regia extraction and Tessier’s five-step sequential extraction. Based on the concentration of metals, the influence of the Hapcheon-Changnyeong weir on sediments in the Nakdong River was assessed. The origins of the contaminants, their bioavailability, and their mobility were determined using sequential extraction. Greater concentrations of heavy metals were found in samples collected closer to the weir. The largest proportion of Cu was identified in the residual fraction based on sequential extraction, whereas Zn was predominantly found in the reducible fraction. Iron-manganese in the reducible fraction of Zn has the potential to leach back to the water body. In addition, the combined concentration of fractions 1 and 2 of Cu comprised more than 20% of total amount that still has potential to affect the water quality. The results of this study were compared with existing sediment standards set out by the NIER (National Institute of Environmental Research), Canada, and US EPA (United States Environmental Protection Agency) guidelines, as well as the risk assessment code (RAC). The concentrations of heavy metals exceeded the standards set by the Canadian guideline by up to four times in particular samples, highlighting the need for continual monitoring.

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