Abstract
In southern Latium region, Central Italy, groundwater and spring water resources in the carbonate aquifers are the major contributors of drinking and irrigation water supply. The aim of this study was to review hydrochemical processes that control the groundwater chemistry and to determine the suitability of springs and groundwater for irrigation and drinking purposes on the basis of the water quality indices. Physical (pH, electrical conductivity, total dissolved solids) and hydrochemical characteristics (Na+, K+, Ca2+, Mg2+, HCO3−, Cl−, and SO4−) of springs and groundwater were determined. To assess the water quality, chemical parameters like sodium adsorption ratio (SAR), total hardness, Mg-hazard (MH), sodium percentage (Na %), salinity hazard, permeability index, and Kelly’s ratio were calculated based on the analytical results. A Durov diagram plot revealed that the groundwater has been evolved from Ca to HCO3 recharge water, followed by mixing and reverse ion exchange processes, due to the respective dominance of Na–Cl and Ca–Cl water types. According to Gibbs’s diagram plots, chemical weathering of rock forming minerals is the major driving force controlling water chemistry in this area. Groundwater and spring samples were grouped into six categories according to irrigation water quality assessment diagram of US Salinity Laboratory classification and most of the water samples distributed in category C2–S1 and C3–S1 highlighting medium to high salinity hazard and low sodium content class. The results of hydrochemical analyses and the calculated water quality parameters suggest that most of the water samples are suitable for irrigation and drinking purposes, except for the samples influenced by seawater and enhanced water–rock interaction. High values of salinity, Na %, SAR, and MH at certain sites, restrict the suitability for agricultural uses.
Highlights
Groundwater is an important natural resource especially for drinking and irrigation uses
Groundwater and spring samples were grouped into six categories according to irrigation water quality assessment diagram of US Salinity Laboratory classification and most of the water samples distributed in category C2–S1 and
The types of water that predominates in the study area are (1) Ca–Mg–HCO3; (2) mixed facies between Ca–HCO3 and Na–Cl; (3) Na–Cl; (4) Ca–Cl (Fig. 2)
Summary
Groundwater is an important natural resource especially for drinking and irrigation uses. The natural water analyses for physico-chemical properties are very important for public health studies (Rizwan and Singh 2009). These studies are a main part of pollution studies in the environment (Palma et al 2010). The variations of water quality are essentially the combination of both anthropogenic and natural contributions (Chen et al 2006). Natural variations in groundwater hydrochemistry should be considered when assessing water quality data from groundwater monitoring programmes, as elevated concentrations for certain parameters might be influenced by the aquifer lithology (Kumar et al 2009).
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