THE SOURCE OF ARSENIC POLLUTION IN GROUNDWATER IN CAT TIEN DISTRICT, LAM ĐONG PROVINCE

Abstract

    During the period of 2014-2015, five sites in Cat Tien District, Lam Dong Province have been drilled to the depth of 45 meters. The concentrations of As(tt), As5+, Fe(tt), NH4+, SO42-, Cl-, Ca2+, Mg2+, PO43- in geological samples including soild, sediment, rock samples from drilling wells have been determined.The obtained analytical results showed that in Cat Tien District, high arsenic levels in groundwater are present in both of the Holocene(adQ) and Pleistocene(J2ln) aquifers.The concentration of arsenic that is absorbed on the surface of iron hydroxides in the sediment samples from drilling wells in Cat Tien is the main source to explain the extreme degree and extent of arsenic pollution in groundwater in Cat Tien District, Lam Dong Province.