Background: This research aims to measure and study spatial changes, and the reason
behind the increasing nitrate content in water wells in the Central District of Khodabandeh
County in the
Methods: The nitrate and nitrite content, electrical conductivity, dissolved oxygen,
temperature, total hardness and pH were measured at 40 sampling stations in the study
area. The obtained features were categorized into four classes by principal component
analysis. The kriging and cokriging methods along with electrical conductivity and total
hardness covariates were used to study the spatial changes. By using the cross-validation
method, the linear model for cokriging method with electrical conductivity covariate was
selected as the best model for nitrate zoning in ArcGIS 10.2 software.
Results: The principal component analysis indicated that nitrate feature was in the same
classification as that of electrical conductivity and total hardness. The comparison of
surface digital elevation model, geology and land use maps with nitrate zoning indicated
that nitrate pollution in the south and south-west regions was due to geological content,
agricultural activities, and the discharge of human sewage into absorbing wells.
Conclusion: The findings of the present research revealed that lowlands with agricultural
use had more nitrate content than other uses, and the most important reason could be
attributed to the excessive use of nitrate containing chemical fertilizers.
Younes Khosravi ,Abbas Ali Zamani ,Abdol Hossein Parizanganeh ,Mir Ali Asghar Mokhtari ,Akbar Nadi ,
Studying Spatial Changes of Groundwater’s Nitrate Content in Central District of Khodabandeh, Iran,
J. Hum. Environ. Health Promot. 2017;
13-20 . DOI: 10.29252/jhehp.3.1.4 Views : 15