Nghiên cứu điều tra sự phân bố về hàm lượng và đánh giá độc tính tương đương của các hợp chất PAHs trong bụi phát thải từ quá trình đốt rơm sau thu hoạch tại Hà nội. Bụi mịn () được lấy bằng thiết bị lưu lượng nhỏ MiniVol TAS (, 4998, TAS, Airmetrics, USA) và bụi tổng (TSP) được lấy mẫu bằng thiết bị lưu lượng lớn (120H Staplex High-Vol sampler, 23759N, USA). | VNU Journal of Science Natural Sciences and Technology Vol. 37 No. 1 2021 97-106 Original Article Distribution and Toxic Equipvalent Assessement of Polycyclic Aromatic Hydrocarbons Pahs in Particulate Matter Emmited from Rice Straw Open Field Burning in Hanoi Pham Chau Thuy1 and Le Huu Tuyen2 1 Vietnam National University of Agriculture Trau Quy Gia Lam Ha noi 131001 Vietnam 2 VNU University of Science 334 Nguyen Trai Hanoi 11400 Vietnam Received 10 November 2020 Revised 17 February 2021 Accepted 28 February 2021 Abstract This study investigated the distribution and toxic equipvalent assesment of PAHs in particulate matter emitted from the open field burning of rice straw in Hanoi. Fine particles was collected using a MiniVol TAS device 4998 TAS Airmetrics USA and the total suspended particles TSP was collected using a high-volume sampler Staplex 120H Staplex 23759N USA . PAHs in particulate matter were analyzed by HPLC-FL with fluorescent detector. The results showed that 4-ring PAHs were dominant in particles emitted from rice straw burning especially the most abundant PAHs was Flu 57 8 37 1 and 64 8 34 9 µg g in and TSP respectively. However the accumulation of PAHs with a higher rings number especially the percentage of BaP in total 9PAHs in emitted from rice straw open burning was 2 times higher than that in the background samples while the ratio of BaP in total 9PAHs in TSP from burning smoke is smaller than that of background samples. The carcinogenic potential of fine particles emitted from rice straw open burning calculated by BaPeq are 20 times higher than that of the background sample. Although the concentration of atmospheric particles - bound BaP in the present study 1 0 0 8 ng m3 is lower than that in urban and traffic areas the average value of BaP is still 8 7 times higher than the value recommended by the WHO. The results of this study show a picture of the toxic levels of atmospheric particles and particles emitted from
