CAJ | 학술논문

采用连续分级提取法对许昌市清潩河河道10个表层沉积物样品中氮形态含量进行测定,分别得到离子交换态氮(IEF-N)、弱酸可提取态氮(WAEF-N)、强碱可提取态氮(SAEF-N)、强氧化剂可提取态氮(SOEF-N)和非可转化态氮(NTN),探讨了不同形态氮分布特征、影响因素及其对河道水环境潜在的风险。结果表明,沉积物中总氮(TN)含量为2140~9470mg/kg,与沉积物有机质含量沿河道变化趋势基本一致；可转化态氮(TTN)的优势形态从上游至下游逐渐由IEF-N向SAEF-N再向SOEF-N转化,逐渐趋于稳定；IEF-N含量受沉积物有机质、pH值及上覆水体氨氮和悬浮物含量影响,且与TN极显著相关,说明清潩河沉积物TN含量可以作为河道内源污染风险判断的重要指标；此外上覆水体较高的COD含量对SAEF-N和NTN的沉积、较高的氨氮含量对IEF-N和TN的释放以及总磷含量对 NTN 活性的增强等都产生影响。因此,在开展清潩河水环境综合整治时,需考虑水相与沉积物相的相互作用,同步开展治理工作。
채용련속분급제취법대허창시청이하하도10개표층침적물양품중담형태함량진행측정,분별득도리자교환태담(IEF-N)、약산가제취태담(WAEF-N)、강감가제취태담(SAEF-N)、강양화제가제취태담(SOEF-N)화비가전화태담(NTN),탐토료불동형태담분포특정、영향인소급기대하도수배경잠재적풍험。결과표명,침적물중총담(TN)함량위2140~9470mg/kg,여침적물유궤질함량연하도변화추세기본일치；가전화태담(TTN)적우세형태종상유지하유축점유IEF-N향SAEF-N재향SOEF-N전화,축점추우은정；IEF-N함량수침적물유궤질、pH치급상복수체안담화현부물함량영향,차여TN겁현저상관,설명청이하침적물TN함량가이작위하도내원오염풍험판단적중요지표；차외상복수체교고적COD함량대SAEF-N화NTN적침적、교고적안담함량대IEF-N화TN적석방이급총린함량대 NTN 활성적증강등도산생영향。인차,재개전청이하수배경종합정치시,수고필수상여침적물상적상호작용,동보개전치리공작。
The amounts of nitrogen forms in 10surface sediments of Qingyi River in Xuchang City were determined by the sequential extraction technique and 4forms of extractable nitrogen (TTN) including ion exchangeable form (IEF-N), weak acid extractable form (WAEF-N), strong alkali extractable form (SAEF-N), and strong oxidant extractable form (SOEF-N) and non-extractable form (NTN) were found. The distribution characteristics, influence factors and potential risks of nitrogen forms to the river environment were also discussed. The results indicated that the concentration of total nitrogen (TN) was in the range of 2140~9470mg/kg, and had the similar distribution trend with the sediment organic matter (OM) along the mainstream. The dominant form of TTN changed from IEF-N to SAEF-N and then to SOEF-N from upstream to downstream, finally tended to be stable. IEF-N content in the sediment was influenced by sediment OM, pH value, and the amount of ammonia and suspended solid in the overlying water, and was significantly related to TN, which showed that TN can be used as an important indicator for judging the endogenous pollution risk of Qingyi River. In addition, in the overlying water high COD concentration had great effect on the sediment of SAEF-N and NTN, high content of ammonia intensified the release of IEF-N and TN, and TP influenced the activity of NTN. Therefore, the interaction of the overlying water and the sediment must be taken into account during the practical river improvement, and the regulation of water body and sediment. This study could provide important guidance to the water environment comprehensive improvement of Qingyi River and the other similar rivers.