Geological mapping and evaluation of groundwater geochemistry in Jedok, Tanah Merah

The present study form groundwater on chemistry of groundwater and geological mapping in Jedok, Tanah Merah Kelantan. Total 13 groundwater samples were collected uniformly from selected locations and analyzed physical properties by using portable instruments such as Multi-Parameter to measure pH, EC, turbidity, TDS and hardness. In addition, chemical properties were also be analyzed samples in UMK laboratory by using different methods such as colorimetric, titration and gravimetric to measure the major anions (SO₄, Cl⁻, HCO₃) and cations (Mg, Ca, K, Na). It is found that the majority of samples showed less than pH 5.9 that can be related to geology of the area covered by granite bedrocks that resulted from weathering process of dissolution of minerals. Three important types of groundwater were identified that is Ca-Mg-Cl-SO₄ type, Mixed type and Alkali Cl-SO₄. All the samples were collected from shallow aquifer that can be resulted more towards anthropogenic process than geo-genic process.