Arsenic biogeochemistry as affected by phosphorus fertilizer addition, redox potential and pH in a west Bengal (India) soil

The impacts of different long-term fertilization regimes on the bioavailability of arsenic in soil: integrating chemical approach with Escherichia coli arsRp::luc-based biosensor

“…pH and P were important direct factors governing the mobility of As in soil. It has been reported that sequestration of As from of Fe-Mn oxides of mineral surfaces was consistently increasing with lower pH (Signes-Pastor et al 2007;Wang and Mulligan 2006;Yang et al 2002), because low pH values could lead to the formation of more positively charged Fe oxides, and then positively charged Fe oxides could adsorb more As anions on the mineral surface (Lafferty and Loeppert 2005;Jain et al 1999). In this research, NPK + M and M treatments have led to a slight increase of pH, but other treatments were opposite.…”

“…Although there was no investigation on P after treatments, the application of NP, NPK, and NPK + M regimens undoubtedly led to an increase of P content (Zheng et al 2008a;Ge et al 2008). Meanwhile, P in fertilization may be another factor affecting the release of As due to its similar chemical properties to As and its competitive sorption with As in the soil matrix (De Brouwere et al 2004;Signes-Pastor et al 2007;Zhao and Stanforth 2001).…”

“…Meanwhile, the release of metal including As from the solid phase of soil was influenced by organic carbon based on the formation of soluble metal-organic complexes (Cao et al 2003;Grafe et al 2002;Harvey et al 2002;Jackson et al 2006;Mladenov et al 2010;Wang and Mulligan 2006). pH and P also have been confirmed as major factors impacting the release of As by the mechanism of competitive anion exchange (De Brouwere et al 2004;Grafe et al 2002;Signes-Pastor et al 2007;Wang and Mulligan 2006;Yang et al 2002;Zhao and Stanforth 2001).…”

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

“…Arsenic is found in a variety of geochemical environments at aqueous concentrations varying from <0.5 to >5000 μg/L, and is found in a variety of geochemical environments [1,2]. Natural and anthropogenically-mediated biogeochemical interactions among arsenic species, biota, and minerals can affect the distribution, mobility, and toxicity of As in the environment [2][3][4][5][6][7][8]. Although recent work has posited that arsenic could be a potential biochemical and astrobiological proxy for phosphorus during biological evolution [9], this hypothesis is controversial [10].…”

“…Although the bidentate binuclear complex is likely to be more stable [88,91], the monodentate species is an intermediate between the bidentate and outer-sphere species. Figure 4 shows desorption of iAsV from a Fe 2 (OH) 4 (H 2 O) 5 -HAsO 4 cluster model, where the model begins as a MM structure with a As-Fe distance of 3.27 Å (Figure 4A), moves through a transition state structure ( Figure 4B), and reaches the outer-sphere structure ( Figure 4C) where the As-Fe distance is 4.36 Å. The Fe-As distances were increased manually and then held constant in each calculation until there ceased to be a bonding interaction.…”