Pollution,Sources,and Health Risk Assessment of PM 10-bound Polycyclic Aromatic Hydrocarbons in Bosten Lake Area,Xinjiang
To understand the pollution level and human health risk of polycyclic aromatic hydrocarbons(PAHs)in atmospheric parti-cles in the Bosten Lake area,a semi-arid region in western China,inhalable particles(PM10)samples were collected from Bohu coun-ty and Tazhong during the heating period in 2016 and non-heating period in 2017.In PM10,16 PAHs,which are prioritized for control by the US Environmental Protection Agency(USEPA),were quantified with gas chromatography mass spectrometry(GC-MS).With the aim to analyze their pollution,sources,and health risks to the population.The results showed that the concentrations of PM10-bound PAHs in Bohu county were significantly higher during the heating period(47.63±29.00 ng/m3)than the non-heating period(3.24±1.05 ng/m3).In comparison,the concentrations of PM10-bound PAHs in Tazhong(2.13±0.90 ng/m3 in the heating period and 1.89±0.23 ng/m3 in the non-heating period)were remarkably lower than Bohu country,without significant seasonal variation.Medium and high cyclic PAHs predominated the PM10 samples in the study areas,with fluoranthene(Flua),pyrene(Pyr),benzo[b]fluoranthene(BbF)and chrysene(Chr)as the major pollutants during the heating period and phenanthrene(Phe),fluoranthene(Flua),indeno[1,2,3-cd]pyrene(IcdP)and benzo[g,h,i]perylene(BghiP)during the non-heating period.The source anal-ysis points out that combustion was the biggest source,accounting for 82.54％and 61.13％of total PAHs emissions in Bohu country and Tazhong.The trajectory analysis demonstrates that PAHs emission from northern Xinjiang and the western Tarim Basin can affect Bosten Lake area through atmospheric transport.The health risk assessment highlights the potential carcinogenic risk for residents in Bohu county,according to the lifetime carcinogenic risk(ILCR)values of PAHs in PM10 valued 10-6～10-4 for all groups of people during the heating period.
Bosten Lake areaPM10PAHssource analysishealth risk assessment
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