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Objective To explore the pollution level and spatiotemporal characteristics of indoor dust di (2-ethylhexyl) phthalate(DEHP) in daily life and the influencing factors of potential family environment and personal living habits, providing scientific basis for the prevention and control of DEHP pollution in indoor dust. Methods Considering the factors of climate, economy and pollution level, household dust samples were collected and investigated in 9 typical cities of Lanzhou, Luoyang, Panjin,Mianyang, Qingdao, Shenzhen, Shijiazhuang, Wuxi, and Xi’an. DEHP content in the treated dust samples was measured using gas chromatography-mass spectrometry (GC-MS). The Wilcoxon rank sum test was employed to examine differences in DEHP levels across various seasons, dominant wind directions, types of home decoration, and living habits. Multiple linear regression was used to identify factors influencing DEHP content in indoor dust. Results DEHP levels in indoor dust varied significantly with season and dominant wind direction in some cities (P<0.05). Specifically, Luoyang and Mianyang exhibited higher DEHP levels during the heating season compared to other periods, while Shenzhen and Shijiazhuang showed lower levels during the heating season (P<0.05). In Mianyang, the upwind areas had significantly higher DEHP levels than the downwind areas (P<0.05). Factors influencing household dust DEHP levels included PM2.5 (β=0.003, 95%CI: 0.001-0.005), PM10 (β=-0.003,95%CI: -0.005 to -0. 001), formaldehyde (β=3.626, 95%CI: 0.195-7.057), and per capita GDP (β=-0.072, 95%CI: 0.050-0.095). Conclusion DEHP is commonly found in indoor dust in daily life. Seasonal variations and wind direction affect its levels in different cities, though no consistent pattern of pollution characteristics is observed across the cities. Additionally,DEHP content in indoor dust may be influenced by temperature, PM10, xylene, computer use, carpet use, and indoor plant cultivation..
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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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