广西坡豪湖氨氮水生生物水质基准及生态风险评估

Water Quality Criteria and Ecological Risk Assessment of Aquatic Organisms with Ammonia Nitrogen in Pohao Lake in Guangxi

为坡豪湖管理提供科学依据,以广西东兰县坡豪湖为研究对象,根据美国国家环保局(US EPA)发布的氨氮水质基准标准,对坡豪湖的氨氮水质基准值〔急性基准值(CMC)和慢性基准值(CCC)〕进行推算,并依此对其进行氨氮暴露生态风险评估。结果表明:7月氨氮水质基准值最高,CMC为2.23mg/L,CCC为0.56mg/L;11月氨氮水质基准值最低,CMC为1.05mg/L,CCC为0.41mg/L;在全年监测中,坡豪湖的风险熵值均小于1。坡豪湖水质基本不存在生态风险。

In order to provide scientific basis for the management of Pohao lake,the Pohao lake in Donglan county of Guangxi was taken as the research object.Using the reference document of the ammonia nitrogen water quality issued by the National Environmental Protection Administration(US EPA)of the United States,the datum value of the ammonia nitrogen water quality of Pohao lake was calculated,and the ammonia nitrogen exposure ecological risk assessment was carried out by the obtained ammonia nitrogen datum value.Results:The standard value of ammonia nitrogen in July was the highest,the acute and chronic criteria were 2.23 mg/L and 0.56 mg/L;The lowest was in November,CMC was 1.05 mg/L,and CCC was 0.41 mg/L.In the past year's monitoring,the risk quotient of lakes did not exceed 1,indicating that Pohao Lake basically had no ecological risk.