Hydrochemical investigations were carried out\r\nin Bukan area, Northwestern Iran, to assess chemical\r\ncomposition of groundwater. A total of 35 groundwater\r\nsamples were collected and analyzed for major cations and\r\nanions. The domination of cations and anions was in the\r\norder of Na?[Ca2?[Mg2?[K? for cations and\r\nHCO3\r\n-[SO4\r\n2-[Cl- in anions. The similarity between\r\nrock and groundwater chemistries in the recharge area\r\nindicates a significant rock-water interaction. The hydrochemical\r\ntypes Na ? HCO3 ? CL ? Mg and Na ? Cl are\r\nthe predominate forms in the groundwater, followed by\r\nwater Ca ? Mg ? SO4 ? Cl and Ca ? Mg ? HCO3.\r\nAssessment of water samples according to exceeding the\r\npermissible limits prescribed by WHO for drinking purposes\r\nindicated that groundwater in study area is chemically\r\nsuitable for drinking uses. The most dominant classes\r\nC2ââ?¬â??S2, C2ââ?¬â??S1 and C3ââ?¬â??S2 were found in the studied area.\r\nThe salinity hazard for water wells is classified as medium\r\nand high salinity.
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