摘要：Iron which is among the most common heavy metals in water supply can be a nuisance despite it is non-hazardous elements. Because ferrous iron in the water sources reacts with air causing turbidity and turns reddish-brown color and it cannot be used as drinking water according to TSE (Turkish Standards Institute) legislations. Ferrous iron concentrations in the ground waters and some surface waters which are used as drinking water sources in Turkey exceed the limit values recommended by EPA (Environmental Protection Agency) legislations. Also iron in waters causes stains in the fabrics and accumulates on pipe walls which cause head loss.The aim of this paper is to establish the effects of inorganic and organic substances which are chosen as the humic acid and SO_4~(2-), NO_3~(2-) ions on the oxidation of low concentration of Fe~(+2) with atmospheric oxygen by using synthetic water.For this purpose, first the calibration curve was obtained from specific concentration of Fe~(+2) by using a spectrometer, then the oxidation of Fe~(+2) with atmospheric oxygen was investigated in batch reactor with and without organic and inorganic compounds. Experiments were conducted under the conditions of Fe~(+2):lmg/L, pH:6.7, temperature:25°C and alkalinity:2xl0~(-2) eq/L.The experimental results show that the oxidation rate of Fe~(+2) decreases in the presence of sulphate and nitrate. Humic acid increases the oxidation rate ofFe+2 in the beginning of the experiment, then decreases. The increase in the humic acid concentrations accelerates the oxidation rate.
