EFFECTS OF SIMULATED SUNLIGHT ON AQUATIC HUMIC MATTER
Natural humic water was treated with simulated sunlight (310-800 nm) and the effects on some chemical parameters and the molecular size distribution of the dissolved organic matter were recorded. The dissolved organic carbon content, the light absorbance (254 nm), and the colour were found to decrease substantially already after irradiation for 24 hours. The proportion of ultraviolet-absorbing low molecular-weight organic material was initially increased. At longer irradiation times (>5 days) part of the dissolved organic matter was found to precipitate.