MX was found to be quantitatively extracted from acidified waters by the XAD resin adsorption technique. 相似文献
The DOC content and the UV-abs. of the water decreased substantially during treatment with UV/H2O2. The decreases were dependent on the time of irradiation (UV dose) as well as on the H2O2 dose applied. The humus macromolecules were degraded to smaller fragments during irradiation. At higher UV doses, however, part of the dissolved organic matter (DOM) was found to precipitate, probably as a result of polymerization. Oxalic acid, acetic acid, malonic acid, and n-butanoic acid were the most abundant degradation products detected. These acids were found to account for up to 20% and 80% of the DOM in UV- and UV/H2O2-treated waters, respectively. No mutagenic activity was generated by the UV irradiation or the UV/H2O2 treatment. It is further concluded that the substantial mutagenic activity formed during chlorination of humic waters cannot be decreased by using UV irradiation as a pretreatment step. 相似文献