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

在日本的区域围场水中广泛检测到硝酸盐氮，并且在许多发达国家中一直成为一个伟大的环境问题。地下水中的硝酸盐被认为主要是从农业实践中施用的农业实践，用于耕地和工业污水的土地应用。该研究计划旨在揭示土地使用的影响，例如森林，可耕地和城市化对地下水化学化学特征，与几家属于地方政府的环境机构合作。与其他化学物质分析了区域地下水中的硝酸盐氮，以计算人类活动中的氮负荷，例如农业实践和污水的土地应用等。为了做到这一点，在亚马加塔（Yamagata）耕地的研究盆地中构建了七个投资井来在不同深度采样不同深度的地下水。特别是，测量了硝酸盐delta ^<15…更多> N的氮同位素值，以区分区域地下水中发现的硝酸盐的起源。结果表明，硝酸盐氮和SO4^<2->离子的浓度随地下水深度减少，而氮同位素比delta^<15> n增加。氮在地下环境中的这种行为意味着浅地下水显然受无机肥料的施用及其导致地下水的影响。除了Yamagata盆地外，在冲绳县的Miyakojima Isle地下水中还测量了同位素值Delta ^<15>N。划分为土地使用的Delta^<15> N值表明，随着地下水经过可耕地的土地，它们往往会略微减少，例如从7.28％到5.76％，并且在城市地区的价值（例如比可耕地的城市）更高。氮同位素比的行为有可能鉴定地下水中氮的起源并使用其他溶解化学物质来计算氮负荷，从而将单个氮源分开。较少的