Multimedia Pollution Characteristics and Risks of Polycyclic Aromatic Hydrocarbons around a Typical Coal-based Industrial Park
A large amount of polycyclic aromatic hydrocarbons(PAHs)would be released into the environment in the pro-cess of coal-based industrial activities,contaminating soil,water and crops,and posing a potential threat to human health.In this study,taking a typical coal-based industrial park in Changzhi,Shanxi Province as the study area,drinking water,indoor and outdoor dust,and grain samples were collected at the center of the park and 2 km,5 km and 8 km upstream and down-stream,respectively.By determining the concentration of PAHs in the samples using chromatography-mass spectrometry(GS-MS),we analyzed the multimedia pollution characteristics of PAHs,and evaluated their human health risks.The results showed that the range of ∑ PAHs in drinking water in the study area was 233.57～337.05 ng/L,which complied with the limit value of ∑PAHs(2×103 ng/L)in the standard of drinking water(GB 5749-2022).As the increase of distance from the center of the study area,the ∑ PAHs in drinking water in both upwind and downwind directions showed a trend of first increasing and then decreasing.The ranges of ∑PAHs in millet and flour were 113.70～2 318.57 ng/g and 108.42～512.30 ng/g,respec-tively,and the trend of ∑ PAHs in grains both upwind and downwind showed an'N'trend with the increase of distance from the center.The levels of ∑ PAHs in indoor dust were higher than those in outdoor dust.As the distance increased,the levels of∑ PAHs in outdoor dust showed a trend of first decreasing and then increasing in both upwind and downwind directions.The carcinogenic risk index of PAHs in drinking water in the study area was within the range of 10-6～10-4,indicating a potential carcinogenic risk,especially for adults.PAHs in indoor dust had stronger carcinogenic risk to humans than outdoor dust,and the carcinogenic risks of indoor and outdoor dusts were higher to adults than children.PAHs in millet and flour posed high carcinogenic risks to humans.
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