Abstract
Purpose Over the last decades, commercial humic products (HPs) from various resources found multiple applications in agriculture and environmental technologies. The key factor defining chemical properties and biological activity of HPs is their organic matter origin. Thus, there is a need to find diagnostic criteria for differentiating organic sources of HPs. The objective was to determine indicators using absorption and fluorescence spectra in combination with derivative spectroscopy that might serve as tools to compare HPs from various environments, both as bulk materials and their humic acid (HA) fractions.
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