Influence Of Arsenite Research Articles

Selenium (Se) as well as mercury (Hg) may influence the methylation and toxicity of inorganic arsenic, but further research is needed with combination of Inorg-arsenic, Se, and Hg

Selenium (Se) as well as mercury (Hg) may influence the methylation and toxicity of inorganic arsenic, but further research is needed with combination of Inorg-arsenic, Se, and Hg

The role of amine in the sequestration of As (III) on functionalized indium tin oxide

The influence of arsenite (As(III)) adsorption on 3-amino-propyl phosphonic-acid (3APPA) has been investigated using X-ray photoemission spectroscopy (XPS), vibrational IR and Raman spectroscopy. The functional amino group on 3APPA appears to play a significant role in the adsorption mechanism. Results of a combined experimental and theoretical investigation provide a comprehensive picture of the geometry and vibrational properties of 3APPA monolayers after interaction with arsenite. Experimental and scaled calculated IR properties display good agreement for the model case where NH2 groups, located as pendant groups on 3APPA surface, interact with the adsorbed As-O network. A charge transfer to the As-O moiety is also indicated by XPS measurements and ionization potential maps generated by DFT. Thus, 3APPA, as a functionalized bio-adsorbant, shows promise towards detection and remediation of As(III) in contaminated wastewater.

Arsenite modifies structure of soil microbial communities and arsenite oxidization potential

The influence of arsenite [As(III)] on natural microbial communities and the capacity of exposed communities to oxidize As(III) has not been well explored. In this study, we conducted soil column experiments with a natural microbial community exposed to different carbon conditions and a continuous flow of As(III). We measured the oxidation rates of As(III) to As(V), and the composition of the bacterial community was monitored by 454 pyrosequencing of 16S rRNA genes. The diversity of As(III)-oxidizing bacteria was examined with the aox gene, which encodes the enzyme involved in As(III) oxidation. Arsenite oxidation was high in the live soil regardless of the carbon source and below detection in sterilized soil. In columns amended with 200 μmol kg(-1) of As (III), As(V) concentrations reached 158 μmol kg(-1) in the column effluent, while As(III) decreased to unmeasurable levels. Although the number of bacterial taxa decreased by as much as twofold in treatments amended with As(III), some As(III)-oxidizing bacterial groups increased up to 20-fold. Collectively, the data show the large effect of As(III) on bacterial diversity, and the capacity of natural communities from a soil with low initial As contamination to oxidize large inputs of As(III).

The mechanism of the formation of organic acids by mould fungi.

The mechanism of the formation of organic acids by mould fungi.