AI Article Synopsis
- Lake sediment serves as a natural sink for polycyclic aromatic hydrocarbons (PAHs), but past assessments of PAH sedimentation in Chinese lakes have been mostly qualitative rather than quantitative.
- Researchers analyzed historical PAH sedimentation data from 51 lakes in China and around the world, finding that PAH concentrations in Chinese lakes (478 ng/g) were significantly lower than those in North America and Europe.
- Between 1900 and 2015, most Chinese lakes experienced increasing PAH sedimentation, with a notable decrease in Southeastern China from 2001-2015, while factors like population growth and coal consumption emerged as key influences on PAH levels.
Article Abstract
Lake sediment is a natural sink for polycyclic aromatic hydrocarbons (PAHs). PAH sedimentation characteristics and their impact factors of Chinese lakes have mainly been qualitative assessed. However, quantitative impacts of PAH sedimentation from different factors have not been well analyzed. To fill this gap, we screened PAH sedimentation records from the literature, for 51 lakes in China and other regions of the world, to identify historical concentration variation and the impact factors of PAHs in different regions, in lake sediment. The results show that PAH concentrations in the sediment core in the selected Chinese lakes (478 ± 812 ng/g dry weight (dw)) were significantly lower than those in North America (5518 ± 6572 ng/g dw) and Europe (3817 ± 4033 ng/g dw). From 1900 to 2015, most of the lakes in China showed an increasing trend of PAH sedimentation concentrations, with the lakes in Southeastern China showed a decreasing trend of PAH concentration in the period of 2001-2015, which was later than the peak times shown in Western countries (1941-1970). The 2-3-ring PAHs were the main components in the sediment core of Chinese lakes, but the proportion to the total PAHs decreased from 72% in 1900-1940 to 55% in 2001-2015. Generalized additive modeling (GAM) was adopted to simulate the associations between PAH sedimentation records and the impact factors. There are large regional variations of economic and industrial development in China. The impact factors of PAH accumulation in the lake sediments differ in different regions. However, population and the consumption of coal, pesticides, and fertilizer were identified to be the most important impact factors influencing PAH sedimentation. The Chinese government needs to strengthen control measures on pollutant discharge to reduce the anthropogenic impact of PAH sedimentation in lakes.
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| http://dx.doi.org/10.1016/j.envres.2023.116690 | DOI Listing |
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