Advertisement
Advertise here Publish your press releases here Sponsor BioPortfolio
Follow us on Twitter Sign up for daily news and research emails Contributors wanted

Sorption mechanisms of phenanthrene, lindane, and atrazine with various humic Acid fractions from a single soil sample.

19:41 EDT 31st July 2014 | BioPortfolio

Summary of "Sorption mechanisms of phenanthrene, lindane, and atrazine with various humic Acid fractions from a single soil sample."

The sorption behavior of organic compounds (phenanthrene, lindane, and atrazine) to sequentially extracted humic acids and humin from a peat soil was examined. The elemental composition, XPS and (13)C NMR data of sorbents combined with sorption isotherm data of the tested compounds show that nonspecific interactions govern sorption of phenanthrene and lindane by humic substances. Their sorption is dependent on surface and bulk alkyl carbon contents of the sorbents, rather than aromatic carbon. Sorption of atrazine by these sorbents, however, is regulated by polar interactions (e.g., hydrogen bonding). Carboxylic and phenolic moieties are key components for H-bonding formation. Thermal analysis reveals that sorption of apolar (i.e., phenanthrene and lindane) and polar (i.e., atrazine) compounds by humic substances exhibit dissimilar relationships with condensation and thermal stability of sorption domains, emphasizing the major influence of domain spatial arrangement on sorption of organic compounds with distinct polarity. Results of pH-dependent sorption indicate that reduction in sorption of atrazine by the tested sorbents is more evident than phenanthrene with increasing pH, supporting the dependence of organic compound sorption on its polarity and structure. This study highlights the different interaction mechanisms of apolar and polar organic compounds with humic substances.

Affiliation

Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University , Beijing 100871, China.

Journal Details

This article was published in the following journal.

Name: Environmental science & technology
ISSN: 1520-5851
Pages: 2124-30

Links

PubMed Articles [6012 Associated PubMed Articles listed on BioPortfolio]

Sorption of phenanthrene on single-walled carbon nanotubes modified by DOM: effects of DOM molecular weight and contact time.

The impacts on the sorption of phenanthrene (PHE) onto single-walled carbon nanotubes (SCNT) by loading of dissolved organic matter (DOM) fractions with different molecular weights (MWs) were studied....

Pyrolytic temperatures impact lead sorption mechanisms by bagasse biochars.

The characteristics and mechanisms of Pb sorption by biochars produced from sugarcane bagasse at 250, 400, 500, and 600°C were examined. The Pb sorption isotherms, kinetics and desorption were invest...

Sorption of Polycyclic Aromatic Hydrocarbons (PAHs) to Lignin: Effects of Hydrophobicity and Temperature.

The study of the sorption of contaminants to lignin is significant for understanding the migration of contaminants in the environment as well as developing low cost sorbent. In this study, sorption of...

Spectroscopic characterization of dissolved organic matter isolates from sediments and the association with phenanthrene binding affinity.

In this study, selected spectroscopic characteristics of sediment organic matter (SOM) were compared and discussed with respect to their different isolation methods, the source discrimination capabili...

Toxicity of atrazine and its bioaccumulation and biodegradation in a green microalga, Chlamydomonas mexicana.

This study evaluated the toxicity of herbicide atrazine, along with its bioaccumulation and biodegradation in the green microalga Chlamydomonas mexicana. At low concentration (10 μg L(-1)), atrazin...

Clinical Trials [584 Associated Clinical Trials listed on BioPortfolio]

Determining Levels of [D10] Phenanthrene Tetraol in Smokers' Urine

The purpose of this research study is to better understand how people respond to cancer-causing chemicals in cigarette smoke. Some people are able to get rid of these chemicals as harmles...

Cross-Over Broccoli Sprouts Trial

The study hypothesis tested is that broccoli sprouts are effective at altering the urinary levels of metabolites of the hepatocarcinogen aflatoxin B1 and of the air-borne pollutant phenant...

Mechanisms of Human Plasticity in the Human System

The purpose of this study is to investigate the physiology associated with plasticity of the motor system. Plasticity refers to the process by which neighboring brain cells assume the res...

Mechanisms of Stroke in Intracranial Stenosis

The objective of this SAMMPRIS-affiliated study is to understand the mechanisms the mechanisms that underlie ischemic stroke recurrence in high-grade intracranial atherosclerotic disease i...

Mechanisms of Glucose Lowering Effect of Colesvelam HCl

The mechanism by which colesevelam HCl lowers glucose is not known. Knowledge of the potential mechanism of action is important for defining the role of the drug among oral antidiabetic a...

Medical and Biotech [MESH] Definitions

Organic matter in a state of advanced decay, after passing through the stages of COMPOST and PEAT and before becoming lignite (COAL). It is composed of a heterogenous mixture of compounds including phenolic radicals and acids that polymerize and are not easily separated nor analyzed. (E.A. Ghabbour & G. Davies, eds. Humic Substances, 2001).

An organochlorine insecticide that has been used as a pediculicide and a scabicide. It has been shown to cause cancer.

A selective triazine herbicide. Inhalation hazard is low and there are no apparent skin manifestations or other toxicity in humans. Acutely poisoned sheep and cattle may show muscular spasms, fasciculations, stiff gait, increased respiratory rates, adrenal degeneration, and congestion of the lungs, liver, and kidneys. (From The Merck Index, 11th ed)

A class of drugs producing both physiological and psychological effects through a variety of mechanisms. They can be divided into "specific" agents, e.g., affecting an identifiable molecular mechanism unique to target cells bearing receptors for that agent, and "nonspecific" agents, those producing effects on different target cells and acting by diverse molecular mechanisms. Those with nonspecific mechanisms are generally further classed according to whether they produce behavioral depression or stimulation. Those with specific mechanisms are classed by locus of action or specific therapeutic use. (From Gilman AG, et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed, p252)

Elimination of toxic or biologically active substances from body fluids by interaction with a sorbent medium. The types of media include absorbents, adsorbents, ion-exchange materials, and complexing agents. Detoxification can be extracorporeal (hemodialysis, hemofiltration, hemoperfusion, plasmapheresis), or occur inside the body (enterosorption, peritoneal dialysis).

Search BioPortfolio:
Advertisement
Advertisement