Characteristics and environmental significance of sulfur isotope signatures in the water environment of typical pyrite mines.

Contaminants in the water environment of different pyrite mines have varying characteristics due to different geological origins. Sulfur isotope (δS) is an effective tool to reveal the mechanism of water environment contamination, but no investigations have yet analyzed the characteristics and environmental significance of the δS in the water environment of different pyrite mines. This study involved a field investigation of four typical pyrite mines in China (representing volcanic, skarn, sedimentary-metamorphic, and coal-deposited types) and the analysis of the hydrochemistry of aqueous samples and the δS of both pyrite and dissolved sulfates.

Characterizing the interactions between copper ions and dissolved organic matter using fluorescence excitation-emission matrices with two-dimensional Savitzky-Golay second-order differentiation.

Monitoring dissolved organic matter (DOM) content in aquatic environments is crucial for not only understanding the dynamics of heavy metals but also predicting their bioavailability. Fluorescence spectroscopy is typically employed to characterise DOM. Here, the interaction between DOM and trace metals was investigated by combining excitation-emission matrix (EEM) quenching with two-dimensional Savitzky-Golay second-order differentiation (2D-SG-2nd-df) analysis.

The Characterization of Dissolved Organic Matter in Reclaimed Water and Its Influence on Copper Toxicity.

Water samples were collected from five phases of treatment in a municipal sewage reclaimed water plant and the DOM was characterized. Results indicated that the components and properties of DOM varied notably with sequential treatments, such as the fluorescence intensity, the molecular weight and the total acidity. Meanwhile the accumulation of Cu in Daphnia magna was analyzed following exposure to samples spiked with 50 µg/L copper, which were decreased by the presence of DOM in those water samples.

The Bioaccumulation and Tissue Distribution of Arsenic Species in Tilapia.

Arsenic is a public concern due to its widespread occurrence and carcinogenicity. Consumption of arsenic-contaminated fish is an important exposure pathway for human health. This study focused on understanding how exposure to arsenic-contaminated fish is informative to human health risk assessment.

Using big data from air quality monitors to evaluate indoor PM exposure in buildings: Case study in Beijing.

Due to time- and expense- consuming of conventional indoor PM (particulate matter with aerodynamic diameter of less than 2.5 μm) sampling, the sample size in previous studies was generally small, which leaded to high heterogeneity in indoor PM exposure assessment. Based on 4403 indoor air monitors in Beijing, this study evaluated indoor PM exposure from 15th March 2016 to 14th March 2017.

Trophic transfer of Cu, Zn, Cd, and Cr, and biomarker response for food webs in Taihu Lake, China.

Water, sediments, and aquatic organism samples were collected from Taihu Lake in China. Four types of typical heavy metal (Cu, Zn, Cd, and Cr) were analyzed to evaluate their concentrations and trophic transfer in food webs. The stable nitrogen isotope δN was used to investigate the trophic interactions.

Aging and behavior of functional TiO nanoparticles in aqueous environment.

Nanoparticles are usually functionalized with various surface capping moieties in practical applications. Understand the behavior and fate of them is critical to evaluate or even predict their risk to environment. However, little attention has been denoted on this issue until now.