Опубликована: Сен. 20, 2024
Язык: Английский
The Science of The Total Environment, Год журнала: 2024, Номер 947, С. 174496 - 174496
Опубликована: Июль 3, 2024
In the sub-Saharan region of Africa, access to safe drinking water remains limited in many countries. This study provides an overview quality surface and groundwater rural peri-urban areas Madagascar, Uganda, Rwanda. Selected physico-chemical parameters, inorganic species (including ions), organic pollution indicators, such as total carbon, non-ionic surfactants, cationic anionic sum phenolic compounds formaldehyde, were analysed. Principal component analysis was applied assess variability identify regional dependencies. The ion composition majority studied samples meets WHO EU requirements for intended human consumption poses no health risk. However, individual non-cancer-causing index nitrates values Water Quality Index show a possible threat ingesting water. presence surfactants (0.1–0.65 mgL−1), (0.025–1.76 mgL−1) formaldehyde (0.04–0.32 may also pose risk human, animal, aquatic life. Additionally, in-situ measurements E. coli Total Coliforms conducted during last field campaign Madagascar (2022) revealed that all sources ranged from intermediate unsafe. result calls urgent need enhance WASH (water, sanitation, hygiene) services areas. both chemical microbiological pollutants shows local authorities develop implement catchment management plan ensure protection resources potential pollution, raise community awareness about impact activity on resources.
Язык: Английский
Процитировано
6
HydroResearch, Год журнала: 2024, Номер unknown
Опубликована: Окт. 1, 2024
Язык: Английский
Процитировано
6
Water, Год журнала: 2024, Номер 16(13), С. 1853 - 1853
Опубликована: Июнь 28, 2024
This study employed hydrochemical data, traditional hydrogeochemical methods, inverse modeling, and unsupervised machine learning techniques to explore the traits origins of groundwater in Changbai Mountain region. (1) Findings reveal that predominant types include HCO3−Ca·Mg, HCO3−Ca·Na·Mg, HCO3−Mg·Na, HCO3−Na·Mg. The average metasilicic acid content was found be at 49.13 mg/L. (2) Rock weathering mechanisms, particularly silicate mineral weathering, primarily shape chemistry, followed by carbonate dissolution. (3) Water-rock interactions involve volcanic dissolution cation exchange adsorption. Inverse alongside analysis widespread lithology, underscores complexity reactions, influenced not only water-rock but also evaporation precipitation. (4) Unsupervised learning, integrating SOM, PCA, K-means techniques, elucidates types. SOM component maps a close combination various components. Principal (PCA) identifies first principal (PC1), explaining 48.15% variance. second (PC2) third (PC3) components, explain 13.2% 10.8% variance, respectively. K clustering categorized samples into three main clusters: one less basaltic geological processes, another showing strong igneous rock characteristics, affected other processes or anthropogenic factors.
Язык: Английский
Процитировано
5
Pure and Applied Chemistry, Год журнала: 2025, Номер unknown
Опубликована: Янв. 28, 2025
Abstract This study investigates the feasibility of use electroplating wastewater as a source copper (Cu) dopants to improve photocatalytic efficacy TiO 2 under visible light for disinfection water contaminated with Escherichia coli . The Cu-doped was produced by sol-gel process, employing titanium tetra-isopropoxide (TTIP) and Cu(II) ions derived from wastewater. By modifying concentration Cu(II), -Cu photocatalysts differing concentrations were synthesized. doping procedure substantially decreased band gap , facilitating activation markedly enhancing its efficacy. ideal Cu determined be 0.60 %, which 3.20 eV (pure ) 2.88 eV. Under light, (0.60 %) photocatalyst attained remarkable 98.21 % reduction E. after 30 min, in contrast mere 38.42 undoped emphasizes using industrial develop economical effective purification purposes.
Язык: Английский
Процитировано
0
Environmental Chemistry and Ecotoxicology, Год журнала: 2025, Номер unknown
Опубликована: Апрель 1, 2025
Язык: Английский
Процитировано
0
Marine Pollution Bulletin, Год журнала: 2024, Номер 211, С. 117397 - 117397
Опубликована: Дек. 11, 2024
This study evaluates heavy metal (Cr, Fe, Ni, Cu, Zn, Hg, Pb, and As) contamination in the Pescara River, Italy, using Total Reflection X-ray Fluorescence, focusing on impact of Bussi landfills. Analyses revealed that most metals exceed WHO drinking water standards, particularly upstream areas near industrial sites. Pollution indices resulted: Nemerow Index (0.43-23.75), Contamination Factor (0.09-104.49), Load (0.14-5.83), Heavy Metal (1.01-1304). Ecological Risk identified severe ecosystem threats one-third samples, while Human Health Assessment substantial non-carcinogenic risks with Hazard Quotients exceeding safety thresholds for both adults (3.57) children (2.00). Specific concerns emerge children's exposure due to their enhanced vulnerability toxicity. Water Quality classified 46.6 % samples as "Very Poor" purposes. Principal component analysis Pearson's correlation indicated anthropogenic sources primary contributors, highlighting urgent need sustainable management strategies.
Язык: Английский
Процитировано
1
Опубликована: Сен. 20, 2024
Язык: Английский
Процитировано
0