Comparison Of Measuring Methods Of Persistent Organic Pollutants Bioavailability And Risk Assessment In Sediments In HunheRiver

The level of Persistent Organic Pollutants(POPs)pollution in sediments can directly affect the health of human and other creatures in research area. Measuring the bioavailability of POPs correctly is the premise of ecological risk assessment. This study chose Fushun-Shenyang basin of Hunhe River as research area and3typical kinds of POPs as study objects, compared the bioavailability with5extraction methods. Then based on the most accurate method results, the paper probed the level of pollution, distribution of the POPs in sediments of research area, and assessed the ecological risk with multiple methods. The results of this paper are as follows:(1)The results of comparing methods of bilavailability measurement show that:the measuring effectivenesses of passive sampling are obviously better than Soxhlet extraction and continuous extraction. The results of passive sampling are close to bioaccumulation of earthworms on total amounts, ditributions, concentration magnitudes and results correlation. While the latter two overestimate the level of pollution and bioavailability of target POPs. In summary the results of PE membrane extraction can reflect the real bioaccumulation best.(2)The level of pollution and distribution of POPs in sediments show that:3rings PAHs have the largest percentage(from30.55%to50.52%); the concentrations of PAHs in sediments are from55.121to162.093ng/g and the level of pollution of PAHs is relatively low compared with other areas.3rings PAHs occupy the largest proportion in interstitial water(from77.77%to96.05%). The concentrations of PAHs in interstitial water are from0.409to2.941μg/L and the level of PAHs pollution is middle when compared with other areas. Source apportionment of PAHs shows that PAHs of research area are mainly come from imperfect combustion of wood and coal. The hydrophobic PAEs have the largest percentage in all target PAEs; the concentrations of PAEs in sediments are from97.33to326.15ng/g and the level of pollution of PAEs is below average level compared with other areas. The hydrophobic PAEs is most prevalent in interstitial water(from67.86%to93.91%); the concentrations of PAEs in interstitial water are from0.778to1.923μg/L and the level of PAEs pollution is relatively low when compared with other areas. The concentrations of BTEX in sediments are from23.83to37.07ng/g while in insterstitial water are0.354～0.702μg/L. The hydrophobic BTEX have the largest parts of all BTEX(from45.7%to83.56%). (3)The results of ecological risk assessment show that:The biological toxicity effect of fluorine may happen occasionally; The probability of toxicity is zero. PAHs in sediments of research area have no obvious risk of cancer or non-cancer health effect on human body. The assessment of ecological toxicity risk shows that target PAHs have no high ecological toxicity risk in research area. There is no potential hazards of biological toxicity of target PAEs in reseatch area for now; the result of human exposure risk assessment shows that PAEs in research area have no obvious risk of cancer or non-cancer health effect on human body; target PAEs have no ecological toxicity risk in research area. The result of human exposure risk assessment of BTEX shows that BTEX in research area have no obvious non-cancer health effect on human body.