Spatiotemporal variation of nitrate concentrations in soil and groundwater of an intensely polluted agricultural area.

ABSTRACT: Nitrate pollution in groundwater is a serious problem in many parts of the world. However, due to the diffuse and common spatially over-lapping character of potential several non-point pollution sources, it is often difficult to distinguish main nitrate sources responsible for the pollution. For this purpose, we present a novel methodology applied to groundwater for an intensely polluted area. Groundwater samples were collected monthly from April 2017 to March 2018 in Shimabara City, Nagasaki, Japan. Soil samples were collected seasonally at soil surface and 50 cm depth at 10 locations during the same period. Sequential extraction by water and extract agents was performed using calcium phosphate for anions and strontium chloride for cations. Mean nitrate concentration in groundwater close

SUBMITTER: Nakagawa K 

PROVIDER: S-EPMC7844300 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature