太湖典型入湖河流氮的污染特征研究(8700字)
摘 要：通过对太湖典型入湖河流洪巷港、沙塘河、烧香港、殷村港漕桥河、太滆运河直湖港、武进港、乌溪港、大港河和望虞河进行布点采样，分析水体和表层沉积物中的氮及其形态。研究表明：入湖河流水质TN浓度在1.75-4.07mg/L之间，平均浓度为2.95mg/L，NH4+-N浓度在0.14-2.1 mg/L之间，平均浓度为0.76 mg/L，NO3--N浓度在0.59-2.00 mg/L之间，平均浓度为1.24 mg/L，NO3--N占TN的比例为42.03%，为氮的主要形态，按《地表水环境质量标准》评价各河流TN浓度，除烧香港、望虞河属于Ⅴ类水体外其余9条河流均为劣Ⅴ类水体；河流表层沉积物中NH4+-N平均浓度为223.95 mg/kg，NO3--N平均浓度仅为1.15 mg/kg，NH4+-N平均浓度为NO3--N平均浓度的195倍，为主要的氮形态。
关键词：太湖；入湖河流；氮污染
STUDY ON CHARACTERISTICS OF NITROGEN POLLUTION IN THE TYPICAL RIVER ENTERING LAKE TAIHU
Abstract: Through stationing sampling at TaiHu lake flood lane Hongxiang port, Shatang river, Shaoxiang port, Yincun port, Caoqiao river, Taige canal, Zhi Hu port,wujin port, Wuxi port, dagang river and Wangyu rive ,which are the typical river flood into the lake of Taihu, analysis nitrogen and the morphological in the surface sediments and water. the results show that: the TN concentration of the inflowing rivers water quality arranges from 1.75to4.07mg/L,and average concentration is 2.95mg/L, the concentration of NH4+-N is from 0.59 to 2.00 mg/L, and average concentration is 0.76 mg/L; the concentration of NO3--N is from 0.14 to 2.1mg/L, and average concentration is 1.24 mg/L; the NO3—N accounting for 42.03% in TN concentration, is the main form of nitrogen. According to the surface water environment quality standard ,evaluations about each river's TN concentration indicate that nine rivers are bad Ⅴ kind of water, besides that other two Shaoxiang port and Wangyu rive belong to Ⅴ kind of water. The average concentration of NH4+-N in river surface sediment is 223.95 mg/kg, and the average concentration of NO3--N is just 1.15 mg/kg, NH4+-N is 195 times average concentration of NO3--N, as the main form of nitrogen.
Key words: Taihu；Inflowing rivers；Nitrogen pollution
目 录
摘 要………………………………………………………………………………………1
关键词………………………………………………………………………………………1
1 前言………………………………………………………………………………………2
2 材料与方法………………………………………………………………………………3
2.1 研究区概况………………………………………………………………………3
2.2 样品的采集及预处理……………………………………………………………4
2.3 样品的测定………………………………………………………………………7
2.3.1 水样中总氮的测定………………………………………………………7
2.3.2 水样中氨态氮的测定……………………………………………………7
2.3.3 水样中硝态氮的测定……………………………………………………7
2.3.4 沉积物中含水率的测定…………………………………………………7
2.3.5 沉积物中氨态氮的测定…………………………………………………7
2.3.6 沉积物中硝态氮的测定…………………………………………………7
3 结果与分析………………………………………………………………………………8
3.1 太湖典型入湖河流水体中氮污染特征…………………………………………11
3.2 太湖典型入湖河流表层沉积物中氮污染特征…………………………………10
4 结论……………………………………………………………………………………14
参考文献……………………………………………………………………………………14
致谢…………………………………………………………………………………………16
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