| The Haihe river basin is one of the best developed region in China. More than130million peoplelives in this region, however, the Haihe river basin is short of water and seriously polluted. The HutuoRiver and Fuyang River which located in the upstream of the Ziya River were selected in this paper. Thesamples were processed and analyzed for concentrations of heavy metals using inductively coupled plasma-mass spectrometry. Spatial distribution of the metals was analyzed, and the geoaccumulation index andpotential ecological risk assessment were used to reveal the ecological risk result from the heavy metalpollution. In order to obtain ideal biological indicators for the detection of the metal, the toxic test withheavy metal which affects the environment more badly was designed. The results are listed as follows:The concentrations of the heavy metals are very low in the water samples of18sampling sites,however, the heavy metals pollution status was worse in the sediments samples. Results were revealed thatthe average concentrations of Cr, Co, Cu, Cd, Mn, Fe, Hg, Pb, Ni, Sn, Se were99.84,15.32,57.82,2.71,567.21,29889.63,0.14,25.69,34.10,3.38,0.78mg/kg in the sediments samples of the Hutuo River,respectively. The samples located in Wutai County were most polluted by Cd, Co, Cr, Cu, Ni, Pb.Uncontaminated to moderately contaminated or moderately contaminated with Cd, Co, Cr was detected inthe downstream of the river located in Shenze County. And the pollution sources are mainly the wastewater discharged by sewage agricultural and industry.Water of the Fuyang River was not seriously polluted by heavy metals. The sample planes located inYongnian County and Shaocunpai were the main pollution parts, and the average concentration of the mainpollution metals (Zn, Cr) were517.04,191.51μg/L, respectively. The concentrations of the heavy metals inthe rest of the Fuyang River were low, and these areas were not polluted by heavy metals. Results wererevealed that the average concentrations of Cr, Co, Cu, Cd, Mn, Fe, Hg, Pb, Ni, Sn, Se were99.84,15.32,57.82,2.71,567.21,29889.63,0.14,25.69,34.10,3.38,0.78mg/kg in the sediments samples of the FuyangRiver, respectively. The ecological risk to the upstream and downstream of the Fuyang River was low. Bycontrast, the reaches of Yongnian County faced considerable risk. The midstream of the river was the mostpolluted area of the river, and the ecological risk to the river reaches around Xingtai City and theAixinzhuang Dam was high. In Xingtai City, the ecological risk to sampling sites13,18, and19was veryhigh. The main pollutants were Cd, As, Cr, Cu, Co, Sn, and Ni. The main sources of pollution wereindustrial and agricultural activities. The waste water generated by standard component factories inYongnian County was the primary source of Cr, Cd, and Sn pollution. The numerous chemical factories, steel mills, and coking and metallurgical plants in Xingtai City contributed substantially to the highecological risk faced by the river reaches.Compared with the results of oxidative damage of Hg2+to Scenedesmus Obliquus, we found thatnumber of cells was decreasing with the increase of Hg2+. Results of the contents of Chlorophyll inScenedesmus Obliquus cells in96h show that Hg2+can promote growth of Scenedesmus Obliquus whenthe concentration of Hg2+was below to0.25mg/L, after the concentration beyond0.5mg/L Hg2+showinhibited effect to the growth of Scenedesmus Obliquus. Changes of concentration of Chlorophyll canreflect the toxicity of Hg2+better. Certain law can also observed in the detection of the contents ofMalondialdehyde and the activity of Superoxide Dismutase, however, when the two indicators were used toreflect the toxicity of Hg2+, good results can not observed. Thus, Chlorophyll Content was an idealbiological indicators for the detection of Hg2+. |
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