Level of Nitrate on Shallow Groundwater in Pleiku City, Gia Lai

Determination of pollution level and spatial distribution of nitrate (NO3-) in groundwater plays an important role in planning and management of groundwater resources, especially in areas with strong agricultural development like Pleiku city. The results of study determine the level of pollution and spatial change of NO3-. The concentration of N – NO3- in shallow groundwater fluctuates from 0,09 to 95,96 mg/l. There are 10/56 samples in the dry season and 28/56 samples in the rainy season, exceeding the permissible limit (QCVN - 09 MT: 2015/BTNMT). N – NO3- concentration has different spatial distribution. The high values appear in the central and northern areas of city. In addition, the study has recorded the positive correlation between groundwater levels and N –NO3- concentration.Most N – NO3- samples exceeding the permissible limit are more than 17 metres in depth