Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： Arsenic (As) and fluoride (F) pollution in water bodies, along with their coexistence, are criticalenvironmental concerns, with long-term exposure posing a significant threat to public health. This study focuseson the Manas River Basin as the research area, analyzing the hydrochemical, and spatial distributioncharacteristics of groundwater with high As and F content. Furthermore, the study aims to elucidate thehydrogeochemical processes related to the origin, migration, and enrichment of As, and F in groundwater,considering geological conditions, occurrence environments, and the influence of human activities. The resultsshow that the groundwater in the study area exhibits an alkaline-reducing environment. The mass concentrationsof As and F in groundwater range from 1.13 to 41.35 μg ·L − 1 and from 0.06 to 8.02 mg ·L − 1, respectively.Groundwater samples with high As and F content constituted 62.9% and 45.7% of the total samples, respectively,while samples with a coenrichment of As and F accounted for 37.1% of the total samples. As- F coenrichedgroundwater is mainly distributed in the northern plain region, near the edge of the desert, with the dominanthydrochemical types being HCO3 ·Cl and HCO3 ·SO4 ·Cl. The primary sources of As and F in groundwater arehigh-content rock strata found in the southern mountainous area of the Manas River Basin. The high pH value,low SO2−4 /Cl− molar ratio, and low Eh of the high-As-content groundwater in the Manas River Basin indicate thata weak alkaline- reducing environment facilitates As enrichment in groundwater. Conversely, groundwater withhigh F content is characterized by high pH, HCO−3 , and Na+ levels, as well as low Ca2+, indicating that an alkalineenvironment with high Na+ and low Ca2+ content favors F enrichment in groundwater.
Hits
Hits
Downloads
Comment