| In recent years, With the increasing worsening of the global oceanic and coastal environment, the chemical behaviors of the environmental Persistent Organic Pollutants in the coastal environment have attracted much attention from the academic society. Studies were carried out in some typical urban coastal and estuarine areas in terms of the distribution laws. The Jiouzhou Bay is highly urbanized, industrialized areas. With the rapid economic development and the huge population growth in Qingdao, Its environment becomes worse and worse, many kinds of contaminants from different sources are inputted. The previous studies have shown that the Jiouzhou Bay have been polluted by many kinds of organic contaminants, including nonylphenol (NP) which is harmful to environment and human health. nonylphenol is persistent organic pollutants that can be transported long range from source areas. It is toxic, persistent and bio-accumulative, even extremely low concentration can cause server effect, Much more concern has been focused on its occurrence and environmental behavior and its ecological risk assessment is of urgent need.The Jiouzhou Bay,The Jiouzhou Bay's main rivers and sewage treatment plants(STPS)were investigated in August 2009 and December, According to the survey results, NP flux flowing into The Jiouzhou Bay are approximately calculated; the distribution characteristics of the NP in various environmental matrices of Jiouzhou Bay and its adjacent rivers were systematically studied; the distribution characteristics of target compounds in environment matrices of the Jiaozhou bay were studied; Base on laboratory experiments, The effects on growth, lipid peroxidation and antioxidant enzymes activities of two species of marine microalgae(SkeLetonema costatum and C.curvisetus) in response to different concentrations of NP were studied by using experimental ecology and biochemical methods. Base on the result of laboratory study, a primary ecological risk assessment of NP was attempted by the calculation of risk quotients. Main conclusions were as follows:1. Contaminative Conditions of NP of Main Rivers and STPS Around the Jiaozhou bay and Pollutant Flux Flowing into Sea of 2009In jiaozhou Bay's adjacent rivers, nonylphenol concentrations in water was 114.7-31678.2ng/l, Moshui River was the most polluted one than others; in 5 STPSs of Qingdao, nonylphenol concentrations in water was 114.4-291.8ng/l..In 2009, NP flux flowing into the Jiaozhou Bay was 1008.03kg in Wet period. The main Sewage units of the jiaozhou Bay are lianwan river,dagu river,moshui river,licun river.haibo river and tuandao Treatment Plant. Their NP flux into jiaozhou Bay are 10.78kg.227.93kg.711.91kg.16.41kg.39.61kg and 1.39kg; the pollutant of NP flux flowing into the Jiaozhou Bay was 591.63kg low water period which is lower than that in wet period,it is mainly due to the change of runoff of rivers. The main Sewage units of jiaozhou Bay are lianwan river,yang river,dagu river,moshui river,loushan river,licun river,haibo river and tuandao Treatment Plant. Their NP flux into jiaozhou Bay are 8.45kg.0.99kg.112.24kg.338.83kg.84.02kg.27.82kg. 18.94kg and 0.64kg.2. The distribution characteristics of target compounds in environment matrices of the Jiaozhou bayThe concentrations of nonylphenol determined in water,and surface sediment in ranged between 18.5-179.3ng/l and 7.1-112.4ng/g, respectively; Concerning the spatial distribution characteristics, the level of phenolic compounds in the northeast of part of Jiaozhou Bay were much higher than the other parts, and this distribution pattern was affected by the pollutant sources, circulation system and water exchange conditions together; and the nonylphenol concentrations in the Jiaozhou Bay were much lower than that in river indicating the inflowing rivers were the main source of NP to Jiaozhou bay. 3. Simulated experiment results in laboratory(1) Growth of two Marine Microalgae Species to NPnonylphenol effect on alga indicated that NP has the inhibitory action under certain concentration to two kind of algae's growths, and suppresses increased by the concentration. The EC50 values were different, the sensitive sequence was SkeLetonema costatum> C. curvisetus.(2) Lipid peroxidation and antioxidant Responses of two Marine Microalgae Species to NPThe two micralgae (SkeLetonema costatum and C.curvisetus) were exposed to NP at various concentrations. After 24h,48h,72h and 96h of exposure, the activities of SOD in both gills and digestive gland were measured. The activities of SOD in different treatment groups were induced at first and then inhibited. The sensitivity of SOD enzymes of two species of marine microalgaes to NP is in the order of SkeLetonema costatum> C. curvisetus.there were significant effects on the malondialdehyde(MDA) content of algal cells treated with fluoranthene at different concentration or ex posed time, indicating that the lipid peroxdation of algae cells increased signi6cantly by fluoranthene stress, which might have adverse effects on the function of algal cell membrane. The sensitivity of MDA content enzymes of two species of marine microalgaes to NP is in the order of C. curvisetus>SkeLetonema costatum.4. Based on the experiment of nonylphenol mentioned above, a primary ecological risk assessment of NP in Jiaozhou Bay,its adjast rivers and STPSs was attempted by the calculation of risk quotients.The value of RQwater in the water of the Jiaozhou Bay was calculated asO.15-1.65, Harmful biological effects especially endocrine disrupting effects might happen to some invertebrates particularly the benthos. The values of RQwater in the inflowing rivers were much higher than the PNECwater of NP except the Baisha River and yang river, The value of RQwater in the water of four STPSs was calculated as 1.057-2.70, the biota were seriously threatened by the phenolic compounds, and measures must be taken immediately to mitigate the risk potential.
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