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The Lluta River, located on the northern Chile, rises in the Andes and flows into the Pacific Ocean at the southern part of Arica City. The river is very precious in this drying area for the water supply source because of the perennial flow. The river water, however, is known as high concentrations of arsenic and boron. On the lower reaches of the Lluta River, the aquifers are composed of river deposits. The hydrogeological conditions of the area suggest that the river water is only the recharge source of the aquifers. Instead of the same origin of the water, the concentrations of arsenic and boron in the groundwater and the river water are different; arsenic is higher in the river water (0. 124 —O. 305mg/L) than in the groundwater (0. 005 —0. 045mg/L), while boron is higher in the groundwater (11. 9 —27. 3mWL) than in the other (10. 7 — 16. 8mg/L). Decrease of the arsenic concentration in the aquifer from the recharged surface water must be caused by filtering process and increase of the boron by condensation.

Changes and Their Factors of Concentrations of Arsenic and Boron in the Process of Groundwater Recharge in the Lower Lluta River Basin, Chile