The Distribution And Consumption Of Health Risk Assessment Of Pbdes In Organisms Collected From The Coastal Of Bohai Sea

Polybrominated diphenyl ethers(PBDEs), as one of the most common brominated flame retardants(BFRs) and a typical persistent organic pollutants(POPs), environmentally persistent, with carcinogenic toxicity, bioaccumulation, and long-distance transportation, widely exists in the marine environment. It is of great significance to study the occurrence of PBDEs in different medium for understanding its environmental behavior.In this paper, the concentration of PBDEs in the benthic organism samples from the surface sediments of Bohai Sea and ten cities along the coast was detected. We investigated the content, spatial distribution, pollution model and BSAF of the PBDEs in the surface sediments and benthic organisms around the Bohai Sea, and also assess its consumption of health risk.The results showed that the concentration of PBDEs(Σ12PBDEs) in surficial sediments collected from the coastal waters ranged from 0.055 to 4.66 ng/g(dry weight, dw) with the mean value of 0.862 ng/g(dw) and the concentration of BDE-209 ranged from 0.347 to 31.1 ng/g(dw) with the mean value of 6.41 ng/g(dw). The concentration of PBDEs(Σ12PBDEs) in surficial sediments collected from center of the sea ranged from 0.064 to 0.499 ng/g(dw) with the mean value of 0.181ng/g(dw) and the concentration of BDE-209 ranged from 0.173 to 3.59 ng/g(dw) with the mean value of 0.862 ng/g(dw). Significantly positive correlation between ∑PAHs and TOCs implied that the organic content was one important factor affecting the distribution of PAHs in surficial sediments. BDE-209 and typical persistent toxic substance PAHs has a significant statistical relationship(r = 0.74, p < 0.01), which indicates that they have a similar input pathway. And values of ∑12PBDEs and TOC shows no significant linear relationship(R2 = 0.13, p < 0.05), indicating that ∑12PBDEs distribute in Bohai Sea by the type of pollutant source. Principal component analysis of PBDEs shows that the PBDEs pollution come from land-based sources mainly. The concentration of columnar samples decreased with the increase of depth, and the sediment concentration in the silt area was higher.The results showed that the total concentration of PBDEs(Σ10PBDEs) in surficial sediments ranged from 0.446 to 26.8 ng/g(dw) with the median value of 1.02 ng/g(dw). The Σ9PBDEs in the benthic organisms ranged from 0.053 to 9.90 ng/g(dw) with the median of 1.25 ng/g(dw). The congener BDE-209 predominated in the surficial sediments with the mean abundance of 90.5%. With a difference, the lowly brominated BDEs was dominated in the benthic organisms, and BDE-47 was the highest congener with the mean abundance of 43.2 ~ 49.7%. The spatial distribution of total PBDEs concentration in sediments and organisms showed a significant difference, which the results around the Laizhou Bay and Jinzhou were significantly higher than those from other areas. The five different species all showed the bioaccumulation and BSAF values of ∑9PBDEs with descending values followed the sequence of Ruditapes philippinarum(0.43 ~ 4.06, mean=1.19) > Mytilus edulis(0.34 ~ 2.86,1.03) > Mactra veneriformis(0.17 ~ 1.95, 0.82) > Anadara subcrenata(0.13 ~ 2.33, 0.61) > Ostrea gigas Thunberg(0.09 ~ 1.20, 0.52). The correlation analysis between octanol-water partition coefficient(log KOW) and BSAFs in different species both showed a decrease trend with the increase of log KOW values except the congener BDE-17. Lifetime cancer risks can be qualitatively described with the following of the range of 10-6 to 10-4. These results suggested that consumption of health risk assessment of PBDEs in organisms collected from the coastal of Bohai Sea tested were extremely low.