Abstract
Dissolved organic matter (DOM) contained in the Tone River as an example of resource for drinking water was analyzed by fluorescence intensity (FI) and fractionation with ozonation. The fractionation into hydrophobic acid and hydrophilic matter was conducted. And the FIs of the fractionated samples were measured as quantitative analysis of the contained DOM. As a result, any FIs in the samples had no relationship with the assimilable organic carbon (AOC) . However, the decrease of FIs of the hydrophilic fractionated samples by ozonation (CT = approx. 0.5 mg min L-1) had highly correlation with AOC. The wavelength used for measuring these FIs were 250 nm/435 nm and 335 nm/435 nm as excitation/emission which were correspondent with the existence of a fulvic acid or humic acid-like substance. Especially those correlation were observed in case of AOC determined by the Pseudomonas fluorescens P17 strain and not by the Aquaspirillum sp. NOX strain. It was suspected that the correlation between AOC and the decrease of FI by ozonation was based on the correspondence of biodegradable organic matter for P17 strain with ozone reactive matter.
