Geochemical mobility of arsenic in the surficial waters from Argentina

Abstract

The presence of arsenic (As) in surface water constitutes an important environmental risk, where mobility and adsorption processes are responsible for its behavior in the sediment-water interface. Therefore, the assessment of adsorption, mobility and water availability of arsenic in freshwater sediments, with agricultural, livestock and urban soil uses was performed. Arsenic concentrations in sediments ranged from 5.4 to 15.9 mg kg -1 (total) and 2.8 to 6.5 mg kg -1 (labile), and those of iron and manganese were 11,563-23,500 and 140.6-662.1 mg kg -1 , respectively. The As levels in water were significantly lower than those of sediments. Results would suggest that As co-precipitation and adsorption on Fe oxides are probably the major route of immobilization, determining its low lability. Manganese did not present an outstanding contribution to the retention, and cation-exchange capacity, pH and organic matter of sediments did not show an influence on the mobility of As.

A review on arsenic in the environment: contamination, mobility, sources, and exposure

“…, Al, Ca, Fe, and Mn) enact a remarkable effect in As phyto availability in soil, and its translocation in different parts of the plants; root microbe-induced transformation system can also impact the fate of As in the rhizosphere; and phosphate and organic matter in the root system tend to reduce As phytotoxicity. 122,192,193…”

“…190 The solubility and speciation of As in a contaminated soil is controlled by pH values of the soil extract, in such a way that the mobilization of As is increased in alkaline medium, resulting in an enhanced phytoavailability 191 Various elements (e.g., Al, Ca, Fe, and Mn) enact a remarkable effect in As phyto availability in soil, and its translocation in different parts of the plants; root microbe-induced transformation system can also impact the fate of As in the rhizosphere; and phosphate and organic matter in the root system tend to reduce As phytotoxicity. 122,192,193 The As soil contamination and sources at various sites of the world are summarized in Table 4. The concentration of total As in 17 locations of surface, agricultural, garden and rhizospheric varied over 126-1600 mg kg −1 .…”

Evaluation of the Acute Effects of Arsenic on Adults of the Neotropical Native Fish Cnesterodon decemmaculatus Using a Set of Biomarkers

“…Arsenic (As) contamination of the environment has become a worldwide problem, with high concentrations being detected in many regions (Barral Fraga et al, 2020; Bundschuh et al, 2021). Groundwater pollution affects the quality and availability of drinking water (Robles et al, 2016). It is estimated that more than 150 million people around the world consume water containing high levels of this metalloid (Arslan et al, 2016; Bundschuh et al, 2021).…”