Implementation of spectroscopic parameters for practical monitoring of natural organic matter

A comparative study on the photocatalytic degradation of humic substances of various origins

“…Since 1996, Bekbolet and coworkers have been studying the photocatalytic degradation of HA in detail, focusing on operational parameters that affect the process efficiency [3][4][5][6]. Complementary to previous research and in parallel to the recent results of a study where UV-vis spectroscopic properties of humic substances have been investigated, this study presents data on the photocatalytic removal of model HA and FA of different origins using TiO2 Degussa P-25 as the photocatalyst [7]. The UVvis properties ofhumic substances are utilized to assess the degradation kinetics that is presented comparatively based on pseudo-first-order and Langmuir-Hinshelwood kinetic models [5,8].…”

Spectral characterization of selected humic substances

“…All these absorption indexes give information about aromaticity of humic substances. E 2 /E 3 is the ratio of absorbance at 250 nm to at 365 nm and often used as an indicator for humification and molecular weight of humic substances (Peuravuori & Pihlaja 1997;Duarte et al 2003;Uyguner & Bekbolet 2005;Li et al 2009). The lower values of E 2 /E 3 ratio of SH, which were isolated from brown soil, compost, and lignite may be indicative of the presence of structures with higher molecular weight, aromaticity, and humification degree.…”

Evaluation of humic acid photocatalytic degradation by UV–vis and fluorescence spectroscopy

“…These UV and Color designated terms were used to signify the previous data [8,9]. The related absorbance ratios were described as E 254 /E 365 (UV 254 /UV 365 ) , E 280 /E 365 (UV 280 /UV 365 ), E 254 /E 436 (UV 254 /Color 436 ), E 280 /E 436 (UV 280 /Color 436 ), and E 300 /E 436 (UV 300 /UV 365 ).…”