Polycyclic Aromatic Hydrocarbons in PM2.5 and PM2.5–10 in Urumqi, China: Temporal Variations, Health Risk, and Sources
| Autor: | Abulikemu Abulizi, Mailikezhati Maihemuti, Xinming Wang, Dilinuer Talifu, Bo Gao, Yusan Turap, Suwubinuer Rekefu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
particulate matter
Atmospheric Science sources 010504 meteorology & atmospheric sciences Coal combustion products 010501 environmental sciences Environmental Science (miscellaneous) Particulates lcsh:QC851-999 Combustion 01 natural sciences chemistry.chemical_compound PAHs chemistry Environmental chemistry Pyrene lcsh:Meteorology. Climatology particle size distribution Health risk Biomass burning Cancer risk Carcinogenic potency 0105 earth and related environmental sciences |
| Zdroj: | Atmosphere, Vol 9, Iss 10, p 412 (2018) Atmosphere Volume 9 Issue 10 |
| ISSN: | 2073-4433 |
| Popis: | PM2.5 and PM2.5&ndash 10 samples were simultaneously collected in Urumqi from January to December 2011, and 14 priority polycyclic aromatic hydrocarbons (PAHs) were determined. The mean concentrations of total PAHs in PM2.5 and PM2.5&ndash 10 were 20.90~844.22 ng m&minus 3 and 19.65~176.5 ng m&minus 3 respectively, with the highest in winter and the lowest in summer. Above 80% of PAHs were enriched in PM2.5, which showed remarkable seasonal variations compared to coarse particles. High molecular weight (HMW) PAHs were predominant in PM2.5 (46.61~85.13%), whereas the proportions of lower molecular weight (LMW) and HMW PAHs in PM2.5&ndash 10 showed a decreasing and an increasing trend, respectively, from spring to winter. The estimated concentrations of benzo[a]pyrene equivalent carcinogenic potency (BaPeq) in PM2.5 (10.49~84.52 ng m&minus 3) were higher than that of in PM2.5&ndash 10 (1.15~13.33 ng m&minus 3) except in summer. The estimated value of inhalation cancer risk in PM2.5 and PM2.5&ndash 10 were 1.63 × 10&minus 4~7.35 × 3 and 9.94 × 5~1.16 × 3, respectively, far exceeding the health-based guideline level of 10&minus 4. Diagnostic ratios and positive matrix factorization results demonstrated that PAHs in PM2.5 and PM2.5&ndash 10 were from similar sources, such as coal combustion, biomass burning, coking, and petroleum combustion, respectively. Coal combustion was the most important source for PAHs both in PM2.5 and PM2.5&ndash 10, accounting for 54.20% and 50.29%, respectively. |
| Databáze: | OpenAIRE |
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