Occurrence of polychlorinated dibenzo-p-dioxins, dibenzofurans and biphenyls pollution in sediments from the Haihe River and Dagu Drainage River in Tianjin City, China

Abstract

The pollution status of polychlorinated dibenzo-p-dioxins, dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) in the sediments of Haihe River, which is the most polluted among the seven largest basins in China, Dagu Drainage River flowing through a chemical industry zone, and two other rivers flowing into Bohai Sea in Tianjin City, China were investigated. The concentrations of PCDD/Fs and PCBs in the sediments from the mainstream of Haihe River were 1.3-26 pg I-TEQ g À1 dry weight (dw) and 0.07-0.54 pg TEQ g À1 dw, respectively. Heavy PCDD/Fs and PCBs pollution, with 1264 pg I-TEQ g À1 dw and 21 pg TEQ g À1 dw, was found in sediment from Dagu Drainage River. The congener profiles of PCDD/Fs indicated that the principal contamination source was the production of pentachlorophenol (PCP) or PCP-Na in this area. The correlation between PCDD/Fs or PCBs and total organic matter (TOM) showed that PCDD/Fs or PCBs were independent on TOM.

Occurrence, sources, and ecological risks of PBDEs, PCBs, OCPs, and PAHs in surface sediments of the Yangtze River Delta city cluster, China

“…Average PCB concentrations of 14.1 − 24.9 ng/g in sediments of the Yangtze River Estuary have been observed by Gao et al (2013), which were higher than the levels in the present study. Our result was also significantly lower than the average PCB levels (ranging from 9.20 to 233 ng/g) in the urban sediments recently reported in China (Liu et al 2007;Yang et al 2009;Zhang et al 2010;Zhao et al 2010a) as well as in many riverine, estuarial, and lake sediments at other locations in the world (Vane et al 2007;Shen et al 2009;Hoai et al 2010;Martinez et al 2010;Ilyas et al 2011). The likely explanation is that the three cities in the present study are all emerging cities where commercial PCBs products were not used in large quantities in the past.…”

Polychlorinated dibenzo-p-dioxins and dibenzofurans in water and six fish species from Dongting Lake, China

“…OCDD, HpCDD, and OCDF have been found to be the main PCDD/F homologs in sediments from the Yangtze and Yellow Rivers (Hui et al, 2009). The PCDD/F congener profiles found in sediments from the Haihe River, the Dagu Drainage River (Liu et al, 2007), and Taihu Lake (Zhang and Jiang, 2005) also agreed well with the results of this study. International and World Health Organization toxic equivalency factors (I-TEFs and WHO-TEFs) (Kutz et al, 1990; Van den Berg et al, 1998) were used to calculate the international toxic equivalents (I-TEQs and WHO-TEQs) for each water sample, to normalize the PCDD/F concentrations and estimate the overall toxicity of the mixtures present.…”

“…There are limited data with which to compare the PCDD/F concentrations found in the Dongting Lake water samples. PCDD/F concentrations of 0.012-0.075 pg L À1 WHO-TEQ were found in the Xijiang River (Liu et al, 2007). Kakimoto et al (2006) found PCDD/F WHO-TEQs of 0.039-3.6 pg L À1 in water samples from Japanese coastal areas.…”

PBDEs, PCBs and PCDD/Fs in the sediments from seven major river basins in China: Occurrence, congener profile and spatial tendency

“…The three contaminants were changed slightly in Tarim River Basin and the concentrations fell into the moderate pollution level compared with those in other rivers of north China (Table S1). Even in Liaohe River, they were at much lower level compared to the previous studies (Liu et al, 2007;Zhang et al, 2010).…”