Assessing Heavy Metals Contamination And Potential Health Risk From Indoor Dust In Shenyang, China

Indoor dust can reflect the air pollution of particulate matter in a period and a certain space. The aim of the article is to assess environmental quality and human health risk correctly. It analyzed heavy metals in indoor dust and outdoor street dust in Shenyang during heating period and unheating period. Comparing with the contents of heavy metals in outdoor street dust, as well as the heavy metals by correlation analysis in indoor dust and outdoor street dust in different areas in Shenyang, and the relationship between the contents of PM2.5, PM10 and contents of heavy metals inindoor dust, it elaborates the sources, influent factors to indoor dust. According to some health risk assessment to indoor dust, the results showed that the contents of heavy metals in heating period is higher than it in unheating period. The average contents of Zn in indoor dust is the biggest, the content is 602.57 mg·kg-1 in heating period, the content is 430.54 mg·kg-1 in unheating period, respectively, it is 1.03 and 1.50 times of street dust; and the average contents of Hg in indoor dust is the lowest, the content is 2.94 mg·kg-1 in heating period, the content is 2.43 mg·kg-1 in unheating period, it is 1.21 and 4.20 times of street dust. Through the analysis of heavy metals contents in different high in the spatial distribution characteristics of residential indoor dust, it concluded that the contents of heavy metals decreased in indoor dust with the increasing height. Compared with other cities at home and abroad, the zinc, copper and lead level in heavy metals in Shenyang is lower than the foreign cities. The contents of heavy metals in indoor dust is higher than it in outdoor dust. The relation between the contents of heavy metals in indoor dust and outdoor dust has obvious correlationship. And PM2.5, PM10 also have the correlationship. Most of heavy metals in indoor dust come from outdoor dust. No matter it is in indoor or outdoor, the health risk of heavy metals to children is more than adults. And Cd, As, Hg and Cr have the risk of cancer to human. And the health risk of heavy metals to human in heating period is higher than it in unheating period.