Groundwater recharge and pollution management using environmental isotope

使用环境同位素进行地下水补给和污染管理

基本信息

批准号：
06650578
负责人：
HIRATA Tatemasa
金额：
$ 1.47万
依托单位：
Wakayama University (1995)National Institute for Environmental Studies (1994)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650578/
关键词：
Groundwater pollution Nitrate nitrogen Chemical fertilizer Sewage water Land treatment Stable nitrogen isotope Land use Groundwater use 硝酸性窒素酸素安定同位体

项目摘要

The nitrate nitrogen was detected widely in the regional gound water of Japan, and has been becoming a great environmental issue in many developed nations. The nitrate in ground water is considered to originate mainly from agricultural practice of fertilizer application to arable land and land application of industrial and domestic sewage.The research program was designed to reveal the effect of land use like forest, arable land and urbanization on the groundwater chemical features in cooperation with several environmental institutes belonging to local governments. The nitrate nitrogen in regional groundwater was analyzed with other chemicals to calculate the nitrogen load from human activities such as the agricultural practice and land application of sewage etc. In order to do that, seven investigation wells to sample groundwaters at different depth were constructed in a study basin of arable land in Yamagata Prefecture. In particular, the nitrogen isotope values of nitrate delta ^<15 … More >N were measured for discriminating the origin of the nitrate discovered in regional groundwater. The results indicated that the concentrations of nitrate nitrogen and SO4^<2-> ion reduce with groundwater depth, while the nitrogen isotope ratio delta^<15>N increases. Such behavior of nitrogen in subsurface environment implies that the shallow groundwater is clearly affected by the inorganic fertilizer application and its leachate to groundwater. In addition to Yamagata basin, the isotope value delta ^<15>N was also measured in the groundwater of Miyakojima Isle in Okinawa Prefecture. The delta^<15> N values classified into the land use showed that they tends to slightly reduce with groundwater passing through arable land, for example, from 7.28 to 5.76 % and that they take higher values in urban area such as about 12% than those in arable land. The behavior of nitrogen isotope ratio has a possibility to identify the origin of nitrogen in groundwater and to calculate nitrogen load with use of other dissolved chemicals, separating individual nitrogen source. Less

日本区域水中广泛的硝酸盐氮被认为是从肥料施用的农业实践中，用于耕地土地和工业和家庭污水的土地应用。与其他化学物质分析了森林水的化学特征。是在Yamagata县的Arable土地上构建的，尤其是在硝酸盐delta ^<15…的硝酸盐中，用于Al地下水的起源。 SO4^<2->离子随着地下水的深度，氮的比率delta^<15>硝酸盐。在冲绳县。。