“…The total concentration of PCDDs (including: 1,3,6,1,3,7,2,3,7,1,2,3,7,1,2,3,4,7,1,2,3,6,7,1,2,3,7,8,1,2,3,4,6,7,HpCDD; and OCDD) ranged from 200 to 460 pg g -1 in 19 sediment core samples (Table 2, Figure 2). Comparison with an earlier study, the total concentration of PCDD/Fs in sediment cores collected from Thua Thien -Hue (Central Vietnam coastal lagoons) ranged 192 to 2910 pg g -1 (Piazza et al, 2010) which were 2 to 5 times higher than the results reported here. Kishida et al (2010) reported the total PCDDs in sediment collected from Can Gio, Thua Thien -Hue, and Hanoi ranging from 350 to 980 pg g -1 , and there was also higher concentration in sediments than reported here.…”