The dissolved organic matter (DOM) protonated fractions of various hydrophobicities were correlated with the tropical peat waters' UV-Vis spectral slopes. This study was conducted to determine how microbubble pre-ozonation affects UV-Vis spectral slopes in tropical peat water treatment processes This study was conducted to determine how microbubble pre-ozonation affects UV-Vis spectral slopes in tropical peat water treatment processes. Microbubble pre-ozonation was carried out at pH 7 followed by alum coagulation and activated carbon (AC) adsorption. The results showed that the log-transformed UV-Vis absorption of processed peat water had four spectral slopes in the range of 220 to 420 nm. The degradation of the transphilic (TPH) DOM fraction had a strong negative correlation with the S220-240 and S241-272 values (R-2 > 0.85). Similarly, the hydrophilic-charged (HPIC) and hydrophilic-neutral (HPIN) fractions had a strong negative correlation with the S220-240 and S241-272 values (R-2 > 0.84 and R-2 > 0.70). Meanwhile, the S273-350 S->350 values had a low and negligible correlation with all analyzed DOM fractions (R-2 < 0.30). The lower wavelength spectral slopes ratio (S220-240/S241-272) was moderately correlated with the DOM fraction, while the correlation with higher wavelength values was negligible. Based on these findings, the UV-Vis spectral slopes ratio at lower wavelengths appears to be useful information for developing a surrogate parameter of DOM fractions in peat water treatment processes.
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