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• A method based on high-resolution mass spectrometry was developed for the analysis of SCCPs. • Investigated the pollution status of SCCPs in the Southern Bohai Sea. • Explores the origin and migration patterns of SCCPs. • Bioconcentration of SCCPs and potential trophic transfer patterns explored. • Marine pollution caused by SCCPs is a concern, and ecological and dietary risks cannot be ignored. The marine environment of the southern Bohai Sea is severely polluted by short-chain chlorinated paraffins (SCCPs). To improve understanding of how SCCPs occur and of how they migrate, are transformed, and transferred in this area, we collected seawater, sediment, and organism samples, and determined the SCCP contents using a new approach based on high-resolution mass spectrometry. The ΣSCCP concentrations in the seawater, sediment, and organism samples ranged from 57.5 to 1150.4 ng/L, 167.7–1105.9 ng/g (dry weight), and 11.4–583.0 ng/g (wet weight), respectively. Simulation of the spatial distribution of SCCPs using Kriging interpolation showed that SCCPs were markedly influenced by land-based pollution. Substantial quantities of SCCPs were transported to the marine environment via surface runoff from rivers that passed through areas of major SCCP production. Once discharged from such rivers into the Bohai Sea, these SCCPs were further dispersed under the influence of ocean currents. Furthermore, the logarithmic bioaccumulation factor that varied from 2.12 to 3.20 and the trophic magnification factor that reached 5.60 (r 2 = 0.750, p < 0.01) suggest that organisms have the ability to accumulate and biomagnify SCCPs through the food chain, which could potentially present risks to both marine ecosystems and human health. [Display omitted] [ABSTRACT FROM AUTHOR]

Inorganic arsenic (iAs) is a widespread contaminant in marine environments, which is present in two different oxidation states (arsenate (AsV) and arsenite (AsIII)) that have complex toxic effects on marine organisms. The scallop Chlamys farreri (C. farreri) accumulates high levels of As and is a suitable bioindicator of As. In this report, we integrated transcriptomics and metabolomics to investigate genetic and metabolite changes and functional physiological disturbances in C. farreri exposured to inorganic arsenic. Physiological indicators antioxidant factors and cell apoptosis analysis macroscopically corroborated the toxic effects of inorganic arsenic revealed by omics results. Toxic effects of inorganic arsenic on C. farreri were signaling-mediated, causing interference with a variety of cell growth and small molecule metabolism. The results provide evidence that inorganic arsenic disrupts the physiological functions of bivalves, highlighting the correlations between different metabolic pathways and providing new insights into the toxic effects of environmental pollutants on marine organisms. [Display omitted] • The metabolism of scallops is disrupted by exposure to inorganic arsenic. • Signaling-dependent toxic effects of arsenic have been tentatively elucidated. • Induced metabolic pathways by inorganic arsenic are described holistically. • Integrated transcriptome and metabolome analysis of inorganic arsenic toxicity. [ABSTRACT FROM AUTHOR]

The wide use of chloramphenicol and its residues in the environments are an increasing threat to human beings. Electroactive microorganisms were proven with the ability of biodegradation of chloramphenicol, but the removal rate and efficiency need to be improved. In this study, a model electricigens, Geobacter metallireducens , was supplied with and Fe 3 O 4 and MnO 2 nanoparticles. Five times higher chloramphenicol removal rate (0.71 d−1) and two times higher chloramphenicol removal efficiency (100%) was achieved. Fe 3 O 4 and MnO 2 nanoparticles highly increased the current density and NADH-quinone oxidoreductase expression. Fe 3 O 4 nanoparticles enhanced the expression of alcohol dehydrogenase and c-type cytochrome, while MnO 2 nanoparticles increased the transcription of pyruvate dehydrogenase and Type IV pili assembly genes. Chloramphenicol was reduced to a type of dichlorination reducing product named CPD3 which is a benzene ring containing compound. Collectively, Fe 3 O 4 and MnO 2 nanoparticles increased the chloramphenicol removal capacity in MFCs by enhancing electron transfer efficiency. This study provides new enhancing strategies for the bioremediation of chloramphenicol in the environments. [Display omitted] • Fe 3 O 4 and MnO 2 particles showed five times increase in chloramphenicol removal rate. • Transcriptomic showed an increase of NADH-quinone oxidoreductase in two treatments. • Fe 3 O 4 and MnO 2 nanoparticles increased electron transfer efficiency. • The primary enzymes for chloramphenicol reduction were different in three treatments. [ABSTRACT FROM AUTHOR]