Assessment of groundwater vulnerability to nitrate pollution caused by agricultural practices

Abstract

Environmental risk assessment is a step towards identification, analysis, and classification of risk factors and thus reduction of the possibility of adverse consequences. In this research, a novel approach for environmental risk assessment on groundwater pollution is applied. By combination of aquifer vulnerability DRASTIC map, pollution severity and prioritizing of the plain regions by the TOPSIS method, more sensitive regions of Qazvin aquifer in Iran are identified. In the first step, seven hydro-geological characteristics of the aquifer are overlaid to produce the potential vulnerability map. Nitrate is used as the pollution parameter and its value in monitoring wells is measured by sampling. Spatial distribution of nitrate concentration is investigated using the ordinary kriging method. The TOPSIS ranking method is also applied to estimate the probability of occurrence of pollution based on five affecting criteria defined and quantified in regions of the aquifer. By production of these three layers, the risk map of the aquifer is generated. Results indicate that 9% of the area of the aquifer is categorized in the high risk level which needs an emergency recovery action plan. Also, sensitivity analysis on the parameters of the aquifer vulnerability shows the effect of the soil media more than other parameters.

Ultrasensitive Detection of Nitrite through Implementation ofN-(1-Naphthyl)ethylenediamine-Grafted Cellulose into a Paper-Based Device

“…Nitrite, a prevalent environmental contaminant − that is released into the environment by human activities such as wastewater treatment, agricultural activities, and industrial processes, − can successfully be quantified at sub-micromolar levels using techniques such as capillary electrophoresis, spectrophotometry, electrochemical detection, and ion chromatography. , While these techniques are useful in laboratory settings, in most cases, they are not easily translocated for onsite, real-time measurements, despite the need to detect nitrite in the field. Many commercially available dipstick test strips have been designed for onsite use, yet these cannot detect sub-micromolar levels that are relevant for environmental monitoring.…”

Denitrification in Intrinsic and Specific Groundwater Vulnerability Assessment: A Review

“…On the other hand, much more attention has been paid to the determination of the different NO 3 − sources, so much so that there are numerous studies that have correlated the rating methods to land use [92][93][94] and to probabilistic models [95,96].…”

Avaliação da vulnerabilidade à contaminação das águas subterrâneas por meio dos métodos AHP e TOPSIS

“…A vulnerabilidade é definida como uma propriedade intrínseca do sistema de água subterrânea que depende da sensibilidade desse sistema aos impactos humanos e naturais (FOSTER et al, 2006;WITKOWSKI;KOWALCZYK;VRBA, 2014;RIBEIRO;PINDO;DOMINGUEZ-GRANDA, 2017). A vulnerabilidade específica é definida como a suscetibilidade de águas subterrâneas a contaminantes específicos ou a um grupo de contaminantes, levando-se em consideração as propriedades contaminantes (EL-FADEL et al, 2014;GOUDARZI et al, 2017;MACHIWAL et al, 2018).…”