Classificação da água subterrânea para uso na irrigação

Abstract

In regions undercontinuous water shortage, implementation of wells is a common practice. Although it is an effective means of obtaining water, this method does not guarantee water quality. In the state of Ceará, the basement of crystalline rockspredominates and, consequently waters contain high con-centrations of ions that confer a high salinity to water. These waters are usedfor irrigation and, waters with high salinity, cause damage to plant species. For this reason, it is necessary to evaluate the water quality for this use. The study was conducted withgroundwater from wells located in five sitesin two different municipalities in the state of Ceará. Water samples were takenfrom January to March 2020 and the selected parameters analyzed were calcium, magnesium and sodium, for the calcula-tion of the Sodium Adsorption Ratio,andElectric Conductivity to make the classification of waters, according to the risks of sodification (sodium) and salinization. The analyses followed the methodol-ogies described in the Standard Methods for the Examination of Water and Wastewater (APHA, 2012) and were carried out at the Environmental Chemistry Laboratory of the Industrial Technology Foun-dation of Ceará (NUTEC).According to the results obtained for risksclasses, it can be concluded that the groundwater was unsuitable for irrigation, unless special precautions are taken for use.