[Risk Assessment of Heavy Metals in Soil Surrounding Manganese Tailings Pond Based on Source-oriented Analysis].

To analyze the source apportionment, potential ecological risk, and health risk of heavy metals in soils surrounding a manganese tailings pond in Chongqing, a positive matrix factorization （PMF） model, potential ecological risk index, and health risk assessment model were used. Further, all three models were combined to explore the risks of heavy metals in soils by different pollution sources to determine the priority control factors. The results showed that except for the Cr concentration, the average values of Mn, Cd, As, Pb, Cu, Zn, and Ni concentration were higher than their corresponding background values.

[Source Apportionment and Influence Factors Analysis of Heavy Metals in Soils Around a Coal Gangue Heap Using the APCS-MLR Model and GeoDetector].

To analyze the source apportionment and influence factors of heavy metals in soils surrounding a coal gangue heap in Chongqing, the absolute principal component scores-multiple linear regression （APCS-MLR） model and GeoDetector were used. The results showed that Cd was the primary pollutant and the average values of Cd, Hg, Pb, Cr, Cu, Zn, and Ni were 1.33, 0.

Quantitative study on the relationship between land use and land cover and diatom community in urban streams.

The study of the impact of urbanization on river ecosystems is an important part of constructing sustainable cities. How to quantitatively study the impact of urbanization on river ecosystems is the difficulty of urban ecological research. This study quantitatively investigated the effects of LULC on water quality and diatom assemblages in urban streams by correlation analysis, multivariate analysis, and path analysis.

Regional transport characteristics of PM pollution events in Beijing during 2018-2021.

Although air pollutant emissions have sharply reduced in recent years, the occurrence of PM pollution events remains an intractable environmental problem in Beijing, and regional transport is the key influence factor. However, it has been difficult to identify regional transport characteristics and the main contributors to pollution events in recent years. In this study, the relative contribution of regional transport was quantified (61.

Evaluating coarse PM composition and sources based on bulk and molecular speciation of PM and PM in Nanjing, East China.

To understand the differences in the composition and sources of PM and PM caused by coarse particles, integrated PM and PM samples were synchronously collected in Nanjing, East China, in summer 2020 and winter 2020/2021. Bulk and molecular speciation and light absorption measurements of aerosol extracts were performed, followed by positive matrix factorization (PMF) based on the PM and PM data sets, respectively. The difference in average concentrations of total bulk species between PM and PM was mainly caused by the distribution of considerable NO, SO, Ca, and organic carbon (OC) in coarse particles.

Algal organic matter triggers re-assembly of bacterial community in plumbing system.

Algal bloom outbreaks in upstream drinking water reservoirs inevitably lead to algal organic matter (AOM) pollution in downstream drinking water plants and distribution systems. However, the responses of indoor piped drinking water quality and microbial community to AOM remain to be well studied. In this study, we investigated the effects of low and high concentrations of Chlorella organic matters on pipe-based drinking water.

Occurrence and ecological risks of organophosphate esters in the sediments of Hangzhou Bay and the East China Sea.

This study investigated 17 organophosphate esters (OPEs) in the surface sediments of Hangzhou Bay and the East China Sea. The mean concentration of ∑OPEs in Hangzhou Bay (235.3 ng/g) was slightly lower than that in the East China Sea (273.

Herbivory and allelopathy contribute jointly to the diversity-invasibility relationship.

Although herbivory and allelopathy play important roles in plant invasions, their roles in mediating the effect of plant diversity on invasion resistance remain unknown. In a 2-year field experiment, we constructed native plant communities with four levels of species richness (one, two, four, and eight species) and used a factorial combination of insecticide and activated carbon applications to reduce herbivory and allelopathy, respectively. We then invaded the communities with the introduced plant Solidago canadensis L.

Source characteristics and quantitative estimates of organic carbon composition in the intertidal zones of Jiaozhou Bay, China.

The Jiaozhou Bay (JZB) intertidal zone is a significant carbon reservoir that plays a crucial role in transporting and accumulating organic matter; however, quantitative studies of organic matter sources are scarce. In this study, we present bulk parameters of total organic carbon (TOC), TOC/TN, δC, and biomarker contents in 36 surface sediment samples from the JZB intertidal zones to quantify the contribution of organic carbon (OC) derived from terrestrial/marine sources, such as C plants, C plants, estuarine productivity, sewage outlets, and marine productivity. The results demonstrated that a two-end-member model based on the traditional indicators of TOC/TN or δC is not appropriate for quantifying the OC source.

Molecular characteristics of organic matters in PM associated with upregulation of respiratory virus infection in vitro.

The extent to which organic matters (OM) in PM affect virus infections and the key organic molecules involved in this process remain unclear. Herein, this study utilized ultra-high resolution mass spectrometry coupled with in vitro experiments to identify the organic molecules associated with respiratory virus infection for the first time. Water-soluble organic matters (WSOM) and water-insoluble organic matters (WIOM) were separated from PM samples collected at the urban area of Guangzhou, China.

An investigative review of the expanded capabilities of thermal/optical techniques for measuring carbonaceous aerosols and beyond.

Carbonaceous aerosols primarily comprise organic carbon (OC) and black carbon (BC). Thermal-optical analysis (TOA) is the most commonly used method for separating carbonaceous aerosols into OC and EC (BC is referred to as elemental carbon EC, in this method). Advances in hardware design and algorithms have expanded the capabilities of TOA beyond just distinguishing OC and EC.

Enhanced prediction of river dissolved oxygen through feature- and model-based transfer learning.

Water quality monitoring data from various points within the same basin often show non-uniformity. A key scientific question is how to extract relevant knowledge from data-rich sites (source domains) and leverage the possible inter-site consistency of water quality to compensate for the limitations of data-poor sites (target domains). Transfer learning (TL) methods can improve the applicability of water quality predictions for data-poor sites but their comparison and combination have not been fully explored.

Evolving patterns of arctic aerosols and the influence of regional variations over two decades.

This study aims to analyze the trends, causes, and future prospects of aerosols in the Arctic region using ground-based observations, satellite data, and reanalysis model data. An analysis of aerosol remote sensing data from AERONET stations in the Arctic from 2000 to 2023 showed a long-term decrease in aerosol optical depth (AOD), aligning with emission regulations in Europe and North America and changes in atmospheric circulation patterns. However, the maximum AOD values observed at AERONET stations in Canada and Russia during the period of 2018-2023 were up to five times higher than the long-term average.

Process-based modeling to reveal spatio-temporal variations of coastal wetland-mediated nutrient removal.

Nutrient pollution intensifies the strain on coastal ecosystems globally. Despite wetlands' significant nutrient removal potential, process-based assessments of nutrient removal in large-scale coastal wetlands face limitations that hinder accurate quantification of water quality improvements. This study proposes a novel quantitative approach by developing a coupled hydrodynamic-water quality-wetland biogeochemical model.

Variations of chloride depletion and its impacts on ozone formation: Case study of a coastal area in Shanghai.

Chlorine plays a critical role in atmospheric chemistry. Marine chloride depletion, as a significant source of atmospheric chlorine, impacts coastal acid deposition, atmospheric oxidizing capacity, and global climate. Based on continuous monitoring data of PM water soluble ions, criteria pollutants, and meteorological data at Chongming Dongtan supersite from 2019 to 2022, variations in chloride depletion and related impact factors were analyzed.

Screening of metal-modified biochars for practical phosphorus recovery.

The utilization of metal-modified biochars (MBCs) for practical phosphorus recovery has attracted significant research interest recently. However, the optimal choice of metals and modification methods for MBCs remains unclear. This study addresses this gap by comparing the phosphate adsorption capabilities of various MBCs using real municipal wastewater.

The key metabolite of fruit flavor change in different ripening stages of .

has an unstable ripening period. Herein, five typical periods of fruit ripening of 'LR' were analyzed by non-targeted metabolomics techniques. The results showed that ripening started 73 days after flowering and reached the ripening criterion at 93 days, a total of 451 differential metabolites were identified for the five periods.

Effects of valley topography on ozone pollution in the Lanzhou valley: A numerical case study.

Valley topography is recognized for its role in constraining pollutant dispersion, which frequently results in elevated pollutant concentrations within valley regions. However, the specific mechanisms by which valley topography influences daytime ozone (O) production, nighttime O depletion, and diurnal variations in O concentrations remain inadequately understood. This study employs the online WRF-Chem air quality model to conduct sensitivity analyses, examining the effects of valley topography on summer O concentrations in Lanzhou, a valley city in western China.

 (Primulaceae), a new species from Sichuan, China.

K.Huang & Z.X.