PCDD/Fs in sediments of Central Vietnam coastal lagoons: in search of TCDD |
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Authors: | Piazza Rossano Giuliani Silvia Bellucci Luca Giorgio Mugnai Cristian Cu Nguyen Huu Nhon Dang Hoai Vecchiato Marco Romano Stefania Frignani Mauro |
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Institution: | aUniversity Ca’ Foscari, Dorsoduro 2137, 30123 Venice, Italy;bCNR-Istituto per la Dinamica dei Processi Ambientali, Dorsoduro 2137, 30123 Venezia, Italy;cCNR-Istituto di Scienze Marine, Via Gobetti 101, 40129 Bologna, Italy;dInstitute for Marine Environment and Resources, 246 Da Nang Street, Haiphong City, Viet Nam |
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Abstract: | Samples from nine Central Vietnam coastal lagoons, together with three soils and sediments collected in two freshwater reservoirs of the Thua Thien-Hué 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. |
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Keywords: | Dioxins Furans Sediments Soils Reservoirs Central Vietnam |
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