大连市中心城区地下水“三氮”污染分析

依据《地下水质量标准》(GB/T 14848-1993),对大连市中心城区2006-2010年地下水"三氮"监测资料进行分析。结果表明,"三氮"的检出率(最高为100%)和超标率(最高为58.8%)都较高,其中亚硝酸盐氮超标显著。氨氮浓度各年均值均超标,呈波动变化;亚硝酸盐氮浓度各年均值均超标,并呈上升趋势;硝酸盐氮各年均值波动变化,总体呈上升趋势。除2009年以外,其他4年中丰水期的硝酸盐氮浓度都比枯水期高;除2007年外,其他4年中的丰水期氨氮浓度都比枯水期低。"三氮"最高浓度值主要出现在中心城区周边区域。

Analysis of "Three Nitrogen" Pollution in Groundwater of the Centre Area in Dalian

According to "Groundwater quality standards" (GB/T 14848-1993), the data of groundwater of the centre area in Dalian during 2006-2010 were analyzed. It was found that: The detection rate (Max value 100%) and the standard exceeding rate (Max value 58.8%) of three nitrogen were all high. Among these, the standard exceeding rate of NO₂^--N was obviously high. The annual average concentrations of NH₄⁺-N exceeded the standard and waved up and down. The annual average concentrations of NO₂^--N exceeded the standard and was in an rising trend. The annual average concentrations of NO₃^--N fluctuated and was in an rising trend, on the whole. Between 2006 and 2010, the concentrations of NO₃^--N in the wet season were greater than those in the dry season except 2007 and the concentrations of NH₄⁺-N in the wet season were lower than those in the dry season except 2009. The max values of three nitrogen were mainly distributed around of the centre area of Dalian.