Between Underground and the Deep Blue Sea: Contamination of Mine Water Effluents by Polychlorinated Biphenyls (PCBs)

ACS ES&T Water, Journal Year: 2023, Volume and Issue: 3(11), P. 3474 - 3484

Published: Nov. 2, 2023

Polychlorinated biphenyls (PCBs) were used as industrial chemicals due to their beneficial physicochemical properties in many applications until the recognition of adverse effects. Although being banned for decades, PCBs are still ubiquitous environment congener-specific high persistence and ongoing remobilization from contaminated sites. While mining influenced water (MIW) was generally known be a potential source PCB contamination, hardly anything about concentrations, congener patterns, or loads. For further elucidation environmental risks, 14 MIW samples five mine effluents analyzed set 58 congeners biphenyl by specifically optimized SPME-GC-MS method (LOD 0.004–0.58 ng L–1). As result, 53 mono- heptachlorinated could detected concentrations 0.01–25.9 L–1 per congener, which mainly tri- but also di- tetrachlorinated identified higher concentrations. Total (0.02–0.12 mg m–3) annual loads (0.1–0.7 kg a–1 mine) show relevance an additional point release environment. Implementation treatment is recommended achieve decrease these contaminant agreement with worldwide efforts eliminate PCBs.

Language: Английский

---

Pollutant bioaccumulation in sentinel fish chronically exposed in Iguaçu river reservoirs (Southern Brazil) and human health risk of fish consumption

Chemosphere, Journal Year: 2023, Volume and Issue: 349, P. 140812 - 140812

Published: Nov. 28, 2023

Language: Английский

---

Reductive dechlorination of 2,4-dichlorophenol by using MWCNTs-Pd/Fe nanocomposites prepared in the presence of ultrasonic irradiation

Ultrasonics Sonochemistry, Journal Year: 2024, Volume and Issue: 105, P. 106871 - 106871

Published: April 7, 2024

The research on developing a purification technology for 2,4-dichlorophenol (2,4-DCP) polluted water with high efficiency and the low energy consumption is crucial achieving several Sustainable Development Goals (SDGs). In order to achieve these goals, MWCNTs-Pd/Fe nanocomposites were prepared by Fe nanoparticles modified multi-walled carbon nanotubes (MWCNTs) palladium (Pd) in presence of ultrasonic irradiation. characterized using Scanning Electron Microscopy (SEM), Transmission (TEM), X-Ray Diffraction (XRD), others. Characterization results confirmed that was successfully prepared, particle size 80 nm specific surface area 89.5 m

Language: Английский

---

PCB169 exposure aggravated the development of non-alcoholic fatty liver in high-fat diet-induced male C57BL/6 mice

Frontiers in Nutrition, Journal Year: 2024, Volume and Issue: 11

Published: May 7, 2024

Polychlorinated biphenyls (PCBs) are lipophilic environmental toxicants. Epidemiological studies have established a link between PCBs and both metabolic syndrome nonalcoholic fatty liver disease (NAFLD). Multiple reported that exposure to PCB156 PCB126 among the 12 dioxin-like leads development of NAFLD. However, elucidate whether PCB169 induces NAFLD by constructing in vivo models not been reported. Therefore, we evaluated effects (5 mg/kg-bw) on hepatic lipid metabolism C57BL/6 mice from control diet high-fat cohorts. The results showed reduced body weight intraperitoneal fat mass diet, but levels were significantly increased, exacerbating diet. Through transcriptomics studies, it was found induced significant up-regulation Ppar γ, Fasn , Aacs genes involved lipogenesis, as well remarkable Hmgcr, Lss Sqle cholesterol synthesis. Additionally, there notable down-regulation α Cpt1 β-oxidation, leading abnormal accumulation liver. In addition, activated Arachidonic acid metabolism, PPAR signaling pathway, Metabolism xenobiotics cytochrome P450, Retinol pathways, so on. Our study suggests can modify gene expression related augument liver, further contribute NAFLD, thereby revealing detrimental associated with PCB animal growth metabolism.

Language: Английский

---

Development of High Surface Area Organosilicate Nanoparticulate Thin Films for Use in Sensing Hydrophobic Compounds in Sediment and Water

Biosensors, Journal Year: 2024, Volume and Issue: 14(6), P. 288 - 288

Published: June 3, 2024

The scope of this study was to apply advances in materials science, specifically the use organosilicate nanoparticles as a high surface area platform for passive sampling chemicals or pre-concentration active sensing multiple-phase complex environmental media. We have developed novel nanoporous (NPO) film an extraction phase and proof concept application adsorbing hydrophobic compounds water sediment. characterized NPO properties provided optimization synthesis coatings order technology films had very area, up 1325 m2/g due level mesoporosity film. potential sorbent sensors samplers evaluated using model chemical, polychlorinated biphenyls (PCB), Sorption PCB porous nanoparticle highly correlated with bioavailable fraction measured whole sediment chemistry, porewater chemistry determined by solid-phase microextraction fiber methods, Lumbriculus variegatus bioaccumulation bioassay. surface-modified were found sorb log octanol-water partition coefficient (Kow) greater than four; however, modification these particles would be required other chemicals.

Language: Английский

---