Decolorization of Humate Solusion by Ultraviolet Irradiation

We describe experimental results and discussions on the decolorization of humate solution by ultraviolet (UV) irradiation. Two kinds of low pressure mercury lamps are prepared as UV source and the shortest wavelength of their light emission are limited at 180 and 200 nm. The absorbance and total carbon concentration in the humate solution is measured by a spectrophotometer and a total organic carbon analyzer. From the results, the temporal variation of absorbance and total carbon concentration in the humate solution is observed after ultraviolet irradiation. It is clarified that the variation of absorbance in the humate solution by UV in shorter than 200nm is remarkable to decolorize the humate solution.