研究报告
肖红伟,肖化云,龙爱民,王燕丽.贵阳地区大气降水中δ15N-NO3-组成及来源分析[J].环境科学学报,2012,32(4):940-945
贵阳地区大气降水中δ15N-NO3-组成及来源分析
- Nitrogen isotopic composition and source of nitrate in precipitation at Guiyang
- 基金项目：国家自然科学基金资助项目(No. 40573006,40721002,40373039)
- 作者
- 单位
- 肖红伟
- 中国科学院南海海洋研究所 热带海洋环境国家重点实验室,广州 510301
- 肖化云
- 中国科学院地球化学研究所 环境地球化学国家重点实验室,贵阳 550002
- 龙爱民
- 中国科学院南海海洋研究所 热带海洋环境国家重点实验室,广州 510301
- 王燕丽
- 中国科学院地球化学研究所 环境地球化学国家重点实验室,贵阳 550002
- 摘要：对贵阳地区2008年10月1日至2009年9月30日大气降水样品中的NO3-浓度和δ15N组成进行了测定.结果表明,这一年大气降水中NO3-浓度加权平均值为0.45 mg·L-1,δ15N组成的变化范围为-8.0‰~28.7‰,年均值为2.3‰,且主要来源于燃煤释放的含氮物质.NO3-浓度呈现冬高夏低的变化趋势,这可能是受降水量等因素的影响.但δ15N组成的季节变化与NO3-浓度有所不同,呈现秋冬季偏正,而春夏季偏负的特征,推测可能是由生物释放氮、大气雷电固氮及NOx本身的大气行为等引起δ15N组成的季节差异.
- Abstract：This study analyzed the concentrations of NO3- and values of δ15N-NO3- in precipitation taken at Guiyang throughout one year from October 1, 2008 to September 30, 2009. The results indicated that the volume-weighted average concentration of NO3- was 0.45 mg·L-1, and the value of δ15N-NO3- ranges from -8.0‰ to 28.7‰ with the annual average of 2.3‰ This implied that the source of NO3- was mainly from coal combustion. Significantly higher NO3- concentration in winter than summer suggested that NO3- concentration was mainly affected by precipitation. Seasonal variation of nitrogen isotopic composition was a bit different, with positive in autumn and winter and negative in spring and summer. This suggested that δ15N-NO3- was mainly affected by biologically-released N, atmospheric nitrogen fixation and NOx behavior in the atmosphere.
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