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Distribution characteristics and ecological risk analysis of microplastics in sediments and effluents related to offshore oil and gas activities in the Bohai Sea, China
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Researchers analyzed the distribution and size characteristics of microplastics in sediments at multiple sites, using ecological risk indices to assess whether plastic concentrations pose hazards to benthic communities in the study area.
Oil and gas activities are sources of marine microplastics (MPs) but have received less attention globally. This study assessed the distribution characteristics and ecological risks of MPs in 31 sediment samples and effluent samples of 5 oil and gas platforms related to offshore oil and gas activities in the Bohai Sea. The results showed that the mean abundance of MPs in sediment, produced water, and domestic sewage was 205.7 ± 151.5 items/kg d.w., 18 ± 11 items/L, and 26 ± 39 items/L, respectively. The MPs in sediments and effluents were dominated by transparent, rayon, and fibers <1 mm. Oil and gas activities may influence the abundance of MPs in the sediments. The sediments in the area were at a low level of risk, but some samples exhibited indexes beyond low levels. The mass of MPs carried by the effluents from oil and gas platforms in the Bohai Sea was less than that of other sources.
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Plastic pollution in the surface water and sediments of China's Bohai Sea was assessed, finding widespread contamination with fragments and pellets, and identifying shipping, river discharge, and coastal aquaculture as major sources.
Pollution characteristics and ecological risk of microplastic in sediments of Liaodong Bay from the northern Bohai Sea in China
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Researchers characterized microplastic pollution in estuarine sediments of Liaodong Bay in northern China, finding that rayon fibers dominated at concentrations averaging 32 to 50 items per kilogram, with ecological risk assessment indicating low to moderate risk levels.
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Researchers sampled sediments from the Bohai Sea and Yellow Sea and found widespread microplastic contamination, with fibers and fragments as the dominant forms, and higher concentrations near river mouths and urban coastlines.
Occurrence, trophic transfer and risk assessment of microplastics in fishery organisms from the Bohai Sea, China
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Researchers assessed microplastic occurrence, trophic transfer, and ecological risk in fishery organisms from a coastal area, finding evidence that MPs accumulated with trophic level and that certain commercially harvested species posed elevated risk to human consumers.
Spatio-temporal distribution of plastic and microplastic debris in the surface water of the Bohai Sea, China
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Researchers monitored plastic debris and microplastics in surface waters of the Bohai Sea across four seasons in 2016-2017, finding a mean density of 0.49 particles per square meter with seasonal and spatial variation across macro-, meso-, and micro-size fractions.
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