Contamination status and temporal trends of persistent toxic substances in sediment cores from coastal areas of central Vietnam

Trinh Thi Tham; Hoang Quoc Anh; Bui Thi Phuong; Le Thi Trinh; Nguyen Thi Thu Thuy; Nguyen Thi Hong Yen; Tran Manh Tri; Tu Binh Minh

doi:10.1016/j.marpolbul.2020.111222

Contamination status and temporal trends of persistent toxic substances in sediment cores from coastal areas of central Vietnam

Mar Pollut Bull. 2020 Jul:156:111222. doi: 10.1016/j.marpolbul.2020.111222. Epub 2020 May 3.

Authors

Trinh Thi Tham¹, Hoang Quoc Anh², Bui Thi Phuong¹, Le Thi Trinh¹, Nguyen Thi Thu Thuy³, Nguyen Thi Hong Yen⁴, Tran Manh Tri⁵, Tu Binh Minh⁶

Affiliations

¹ Faculty of Environment, Hanoi University of Natural Resources and Environment, Cau Dien, Tu Liem, Hanoi, Viet Nam.
² Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Viet Nam; Center of Advanced Technology for the Environment, Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan. Electronic address: hoangquocanh1990@gmail.com.
³ Faculty of Chemistry, TNU University of Science, Thai Nguyen University, Tan Thinh Ward, Thai Nguyen City, Viet Nam.
⁴ National Institute of Hygiene and Epidemiology, Hai Ba Trung, Hanoi, Viet Nam.
⁵ Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Viet Nam.
⁶ Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Viet Nam. Electronic address: tubinhminh@gmail.com.

PMID: 32366366
DOI: 10.1016/j.marpolbul.2020.111222

Abstract

Residue concentrations of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and polybrominated diphenyl ethers (PBDEs) were measured in sediment core samples from two estuary areas of central Vietnam to elucidate recent status and temporal trends of pollution based on the depth profiles. Concentrations of PCBs, PBDEs, and endosulfan compounds were generally higher than those of the remaining OCPs. Peak concentrations of OCPs were found in the sediment layers corresponding to the late 1950s to the early 1980s, implying the intensive application of these insecticides in Vietnam during such periods. Although the highest PCB concentrations were measured in sediment layers dated in the 1970s, increasing PCB residues observed in the shallower layers may be related to the strong industrialization and urbanization in Vietnam. BDE-209 exhibited increasing concentrations and proportions to total PBDEs towards shallower depths, suggesting substantial use and on-going releases of deca-BDE products in recent years.

Keywords: OCPs; PBDEs; PCBs; Sediment cores; Vietnamese coastal areas.

MeSH terms

Environmental Monitoring
Geologic Sediments
Halogenated Diphenyl Ethers / analysis
Polychlorinated Biphenyls / analysis*
Vietnam
Water Pollutants, Chemical / analysis*

Substances

Halogenated Diphenyl Ethers
Water Pollutants, Chemical
Polychlorinated Biphenyls