Potential release of dissolved organic matter from agricultural residue-derived hydrochar: Insight from excitation emission matrix and parallel factor analysis

Potential release quantity and quality of dissolved organic matter (DOM) from hydrochar (HDOM) in various environmental conditions were investigated. Corn cobs utilized as model agricultural residue to prepare the hydrochar. Four extracts, ultra-pure water, acid solution, alkali solution salt two temperatures, 20 °C 60 °C, adopted imitate conditions. Excitation-emission spectrophotometry with parallel factor analysis was used evaluate chemical properties HDOM. The results showed that carbon HDOM high, ranging 46 268 mg g?1. components confirmed HDOM: mixed substances humic-like protein-like components, marine substances, terrestrial tyrosine-like substances. Alkalinity high temperature could enhance leaching amount HDOM, particularly change relative proportion quality. In addition, values fluorescence indexes indicated microbial availability. Released may result significant impacts ecosystem functionality. These findings reveal potential characteristics environment, opening new doors understanding guiding its rational application.