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Nitrated polycyclic aromatic hydrocarbons (NPAHs) and oxygenated polycyclic aromatic hydrocarbons (OPAHs) are two important derivatives of polycyclic aromatic hydrocarbons (PAHs). Samples from households in Tianjin indoor dust deposition were collected from April to May 2023 in this study. The concentrations of 18NPAHs and 5OPAHs were analyzed by GC-MS, and the concentration characteristics and source apportionment of these substances were discussed. The results showed that the median concentrations of ∑18NPAHs and ∑5OPAHs in Tianjin indoor dust deposition were 37.95 and 248.82ng/g, respectively. The median concentrations of ∑18NPAHs and ∑5OPAHs in the urban area were slightly higher than those in the surrounding urban area.There were no significant differences in these substance concentrations of ∑18NPAHs and ∑5OPAHs between the urban area and the surrounding urban area in Tianjin. From the perspective of different influencing factors, there was a statistically significant difference in the impact of smoking habits and energy types on the monomer concentrations of some NPAHs and OPAHs in Tianjin indoor dust deposition. The results of the characteristic ratio method showed that NPAHs in Tianjin indoor dust deposition mainly originated from primary emissions of combustion sources and vehicle exhaust emissions, and some secondary generation mainly formed by OH· catalytic reactions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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