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Phân tích đồng thời và sơ bộ ước đoán nguồn phát thải của các polyclo biphenyl và polybrom diphenyl ete trong mẫu bụi được lấy trên mặt đường tại một số khu vực ở miền Bắc Việt Nam

Bài viết tiến hành lựa chọn đối tượng phân tích là mẫu bụi trên mặt đường để xác định đồng thời hàm lượng của 2 nhóm chất POPs điển hình là PCBs và PBDEs. | VNU Journal of Science Earth and Environmental Sciences Vol. 37 No. 1 2021 52-60 Original Article Simultaneous Determination and Preliminary Source Estimation of Polychlorinated Biphenyls and Polybrominated Diphenyl Ethers in Road Dust from Northern Vietnam Hoang Quoc Anh1 2 Shin Takahashi2 Thai Thu Thuy3 Pham Thi Ngoc Mai1 Nguyen Thi Anh Huong1 1 University of Science Vietnam National University Hanoi 19 Le Thanh Tong Hanoi Vietnam 2 Center of Advanced Technology for the Environment CATE Ehime University 3-5-7 Tarumi Matsuyama 790-8566 Japan 3 Institute for Tropical Technology Vietnam Academy of Science and Technology A13 18 Hoang Quoc Viet Hanoi Vietnam Received 22 January 2020 Revised 21 July 2020 Accepted 28 July 2020 Abstract Concentrations of seven indicator polychlorinated biphenyls Ʃ7PCBs and eight predominant polybrominated diphenyl ethers Ʃ8PBDEs were examined in outdoor dust samples collected from some representative areas in northern Vietnam including a core urban area of Hanoi City an industrial park in Thai Nguyen Province and a rural area in Bac Giang Province. Levels median and range of Ʃ7PCBs and Ʃ8PBDEs in our dust samples were 2.8 0.028 22 and 11 0.55 52 ng g respectively. Concentrations of PCBs and PBDEs in the urban and industrial dust samples were significantly higher than those measured in the rural ones suggesting the role of urbanization- industrialization processes on the emission of these pollutants. PCBs exhibited specific profiles in the industrial dusts with significant proportions of low-chlorinated congeners such as CB-28 and CB-52 while the remaining samples were more contaminated by heavier compounds such as CB- 118 CB-138 and CB-153. For PBDEs BDE-209 was the most predominant congener in all the samples. Emission souces of PCBs and PBDEs in our dust samples were estimated to be household traffic and industrial activities. Human exposure to PCBs and PBDEs in outdoor dusts was estimated implying relatively low health risk. Keywords