Chất lượng không khí trong nhà ngày càng được quan tâm do con người dành nhiều thời gian hơn cho các hoạt động ở trong nhà. Các mẫu bụi hô hấp được thu thập tại các trường mầm non trên địa bàn Hà Nội trong tháng 5 và 6 năm 2018. Mẫu bụi được lấy đồng thời trong lớp học và ngoài sân trường tại các thời điểm trong giờ học và buổi tối. | VNU Journal of Science: Natural Sciences and Technology, Vol. 35, No. 1 (2019) 1-10 Original article Concentration and Health Risk Assessment of Heavy Metals in Airborne Particles at Nursery Schools in Hanoi Tran Dinh Trinh*, Nguyen Thi Thuy Men Faculty of Chemistry, VNU University of Science, 19 Lê Thanh Tong, Hanoi, Vietnam Received 03 september 2018 Revised 29 November 2018; Accepted 25 December 2018 Abstract: Indoor air quality is increasingly important as people spend more and more time for indoor activities. A sampling campaign was conducted to sample airborne particles at nursery schools in Hanoi in May and June 2018. The sampling strategy was performed during lessons and in absence of children in classrooms. Heavy metals and trace element s (Cu, Pb, Cd, Zn, Ni, As, Mn, Cr, Hg, Fe ) were quantified by using ICP-MS method. Emission sources of heavy metals were estimated using statistical analyses such as factor analysis while cancer risk assessment was conducted using chronic daily intake (CDI) and slop factor (SF). In the presence of children, indoor concentrations of heavy metals and trace elements were within the range from 1,7-3,2 ng/m3 (Cd) to 1588-3238 ng/m3 (Zn), while these corresponding values obtained when the rooms were empty were in the ranges of 0,6-0,9 and 746,2-2011 ng/m3. Indoor/outdoor ratios of studied elements varied from school to school and ranged from to , implying presence of indoor emission sources. The calculated cancer risks ranged from -6 to -4, being hihgher than limit values set by USEPA, implying significant health risk to young children. Keywords: Indoor air quality, heavy metals, ICP-MS, health risk, young children, Hanoi. _ Corresponding author. Email address: trinhtd@ 1 VNU Journal of Science: Natural Sciences and Technology, Vol. 35, No. 1 (2019) 1-10 Original article Nghiên cứu xác định nồng độ và đánh giá rủi ro phơi .
