Quality investigation of water resources is important for suitable management and environment protection. In this study, quality determination and classification of groundwater in Chenaran arable plain, North East of Iran, Razavi Khorasan Province, were examined for drinking and industrial usages. Eight groundwater samples were collected form the Chenaran plain in September 2018. Temperature, pH and electrical conductivity were measured at the field. Major cations (Ca2+, Mg2+, Na+, K+) and anions (Cl-, SO42-, HCO3-and CO32-) were analyzed in central chemical laboratory in Ferdowsi University of Mashhad. Electrical conductivity (EC) value was varied from 412 to 5100 µs/cm. Dominant cations and anions were Ca2+, Mg2+, HCO3- and Cl- in the samples. The Gibbs diagram, which is provided using Cl/Cl+HCO3 and Na/Na+Ca vs. TDS, shows three main controlling processes such as precipitation, water-rock interaction and evaporation. According to the diagram, the groundwater samples were affected by a water-rock interaction and partly evaporation. Also, based on ionic ratios as Na/Na+Cl and Mg/Mg+Ca, Na-bearing silicate minerals dissolution, ionic exchange, limestone and dolomite weathering, and rare halite dissolution has a significant effect on water composition.

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