Speciation of selenium in groundwater is essential from the viewpoint of toxicity to organisms and biogeochemical cycling. Selenium speciation in groundwater is controlled by aquifer redox conditions, microbial transformations, dissolved oxygen (DO) and other redox couples. A suburban area of Chennai city in India, where improper waste disposal measures have been practiced is selected for this study. Se(IV), Se(VI) and other hydrochemical parameters were monitored in shallow ground water during pre- and post-monsoon seasons for a period of three years. The objective of the study was to investigate the effect of groundwater recharge on selenium speciation. The concentration of Se(IV), and Se(VI) ranged between 0.15-0.43 μg L(-1) and 0.16-4.73 μg L(-1), respectively. During post-monsoon period the concentration of Se(IV), and Se(VI) ranged between 0.15-1.25 μg L(-1) and 0.58-10.37 μg L(-1), respectively. Se(VI) was the dominant species of selenium during the pre- and post-monsoon periods. During the post-monsoon periods, leaching of selenium from soil was more effective due to the increased oxidizing nature of the groundwater as indicated by the DO and redox potential (Eh) measurements. This finding has important implications on the behavior of selenium in groundwater, and also on the health of people consuming groundwater from seleniferous areas.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2011.05.013 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Differential tissue accumulation in the invasive Manila clam, Ruditapes philippinarum, under two environmentally relevant lanthanum concentrations.
Environ Monit Assess
December 2021
Division of Oceanography and Marine Environment, IPMA - Portuguese Institute for Sea and Atmosphere, Av. Alfredo Magalhães Ramalho, 6, 1495-165, Algés, Portugal.
Among the environmental emerging concern rare earth elements, lanthanum (La) is one of the most common and reactive. Lanthanum is widely used in numerous modern technologies and applications, and its intense usage results in increasing discharges into the environment, with potentially deleterious consequences to earthlings. Therefore, we exposed the important food resource and powerful monitoring tool Manila clam to two environmentally relevant concentrations of La (0.
View Article and Find Full Text PDFT2-High Endotype and Response to Biological Treatments in Patients with .
Biomedicines
July 2021
Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, 20090 Milan, Italy.
Article Synopsis
- Recent studies have identified a new type of inflammation (T2-high endotype) in bronchiectasis, which contrasts with the previously accepted neutrophilic inflammation.
- A cross-sectional study found that 31% of bronchiectasis patients without asthma exhibited characteristics of the T2-high endotype, leading to more severe symptoms and reduced quality of life.
- In a separate case series, severe asthmatic patients with bronchiectasis showed significant reduction in exacerbation rates after treatment with mepolizumab or benralizumab, highlighting the potential benefits of targeting the T2-high endotype in future clinical trials.
Usefulness of Hybrid Magnetoliposomes for Aminoglycoside Antibiotic Residues Determination in Food Using an Integrated Microfluidic System with Fluorometric Detection.
J Agric Food Chem
June 2021
Departamento de Química Analítica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Universidad de Córdoba, Campus de Rabanales, Edificio Anexo "Marie Curie", E-14071 Córdoba, España.
A new microfluidic approach using hybrid magnetoliposomes (h-MLs) containing hydrophobic magnetic nanoparticles (FeO@AuNPs-C12SH) and encapsulated -acetylcysteine has been developed in this research to determine aminoglycoside antibiotic (AAG) residues in food using -phthalaldehyde. Four AAGs, kanamycin, streptomycin, gentamicin, and neomycin, have been used as model analytes. The h-MLs have been used for reagent preconcentration and were retained using an external electromagnet device in the reaction/detection zone in a microfluidic system, inserted into the sample chamber of a conventional fluorimeter.
View Article and Find Full Text PDFRecovery of Cr(III) by using chars from the co-gasification of agriculture and forestry wastes.
Environ Sci Pollut Res Int
August 2019
Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar, Ed. J, 1649-038, Lisbon, Portugal.
The aim of the present work was to assess the efficiency of biochars obtained from the co-gasification of blends of rice husk + corn cob (biochar 50CC) and rice husk + eucalyptus stumps (biochar 50ES), as potential renewable low-cost adsorbents for Cr(III) recovery from wastewaters. The two gasification biochars presented a weak porous structure (A = 63-144 m g), but a strong alkaline character, promoted by a high content of mineral matter (59.8% w/w of ashes for 50CC biochar and 81.
View Article and Find Full Text PDFEffects of Multivitamin, Multimineral and Phytonutrient Supplementation on Nutrient Status and Biomarkers of Heart Health Risk in a Russian Population: A Randomized, Double Blind, Placebo Controlled Study.
Nutrients
January 2018
Access Business Group International, LLC, 5600 Beach Blvd., Buena Park, CA 90621, USA.
Article Synopsis
- * It included 120 participants aged 40-70 over a period of 56 days, split into two groups receiving either the VMP or a placebo, with various blood nutrient levels and heart health biomarkers measured throughout.
- * Results showed that VMP supplementation increased key nutrients like quercetin and vitamin C, while also reducing harmful heart health markers such as homocysteine and gamma-glutamyl transferase, suggesting overall heart health benefits from the VMP.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!