用离子交换树脂柱法观测长春市大气氮沉降

Monitoring Atmospheric Nitrogen Deposition in Changchun Using Ion Exchange Resin Columns Method

为了解城市环境中大气氮沉降的特点,于2008年9月—2009年9月,使用离子交换树脂柱法对长春市大气氮沉降进行了观测.结果表明:观测期间,长春市大气硝态氮沉降量月均值为5.33mg/m2,亚硝态氮沉降量月均值为1.67mg/m2.大气硝态氮和亚硝态氮沉降量有明显的局部分异特点,沉降量大的地点主要分布在交通干线和热电厂周边地区,显示了大气硝态氮的点源和线源特征.大气氨氮沉降量月均值为3.10mg/m2;各观测点间大气氨氮沉降量变化明显小于硝态氮和亚硝态氮,显示了大气氨氮的面源特征.

In order to understand the characteristics of atmospheric nitrogen deposition in urban environments,observations were carried out in Changchun from September 2008 to September 2009 using the ion exchange resin columns method. The results showed that the monthly average value of atmospheric nitrate nitrogen deposition was 5. 33 mg /m2 ,and that of nitrite nitrogen deposition was 1. 67 mg /m2. Atmospheric nitrate and nitrite nitrogen deposition had obvious local differences; there were relatively large amounts of deposition around traffic arteries and power plants,which showed the characteristics of point /line source of atmospheric nitrate and nitrite nitrogen depositions. The monthly average value of atmospheric ammonia nitrogen deposition was 3. 10 mg /m2. The change of atmospheric ammonia nitrogen deposition among monitoring points was obviously smaller than that of atmospheric nitrate and nitrite nitrogen depositions,which showed the characteristics of non-point sources of atmospheric ammonia nitrogen deposition.