PCDD/Fs in sediments of Central Vietnam coastal lagoons: In search of TCDD

MARINE POLLUTION BULLETIN

卷:60

Article

Piazza, Rossano^2,3  Giuliani, Silvia¹  Bellucci, Luca Giorgio¹  Mugnai, Cristian¹  Nguyen Huu Cu⁴  Dang Hoai Nhon⁴  Vecchiato, Marco²  Romano, Stefania¹  Frignani, Mauro¹ 

[1] CNR, Ist Sci Marine, I-40129 Bologna, Italy

[2] Univ Ca Foscari, I-30123 Venice, Italy

[3] CNR, Ist Dinam Proc Ambientali, I-30123 Venice, Italy

[4] Inst Marine Environm & Resources, Haiphong City, Vietnam

关键词: Dioxins;    Furans;    Sediments;    Soils;    Reservoirs;    Central Vietnam;   

DOI  :  10.1016/j.marpolbul.2010.09.023

来源: Elsevier

【 摘 要 】

Samples from nine Central Vietnam coastal lagoons, together with three soils and sediments collected in two freshwater reservoirs of the Thua Thien-Hue province, were analysed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). Total concentrations are low, from 192 to 2912 pg g(-1) and depth profiles in Tam Giang-Cau Hai (TG-CH) sediment cores show only minor changes over time in PCDD/F input and composition. Octachloro dibenzo-p-dioxin (OCDD) is the prevailing congener (approximately 90%), indicating combustion as the main PCDD/F source to these coastal systems, whereas natural formation might be partly responsible for the presence at depth. 2,3,7,8-Tetrachloro dibenzo-p-dioxin (TCDD), largely sprayed together with Agent Orange over the study areas during the war (1961-1971), is absent or very low. This result supports the hypothesis of strong degradation soon after spraying. Multivariate statistical analyses account for the presence of local, short-range sources as observed in the northern part of the TG-CH lagoon. (C) 2010 Elsevier Ltd. All rights reserved.

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