Revealing the Inner Changes of Component Composition Derived from DOM PARAFAC Based on Two-Dimensional Correlation...

Area of Science:

• Environmental Chemistry
• Soil Science
• Organic Geochemistry

Background:

• Dissolved organic matter (DOM) in compost contains humic acid components.
• Fluorescence spectroscopy is a key technique for analyzing DOM.
• Understanding DOM transformation during composting is crucial for soil health.

Purpose of the Study:

• To characterize the dynamic changes in DOM components during composting.
• To investigate the evolution of DOM fluorescence peaks within PARAFAC components.
• To elucidate the formation pathways of complex DOM fluorescence substances.

Main Methods:

• Employing fluorescence excitation-emission matrix (EEM) coupled with parallel factor analysis (PARAFAC).
• Utilizing two-dimensional correlation spectroscopy (2DCOS) to analyze DOM dynamics.
• Identifying and tracking five individual DOM PARAFAC components throughout composting.

Main Results:

• PARAFAC analysis identified distinct DOM components, with simple C1 absent and complex C5 present at composting's end.
• 2DCOS revealed differential variations in PARAFAC component peaks during composting.
• The degradation of simple fluorescence peaks contributes to the formation of complex DOM fluorescence substances.

Conclusions:

• Simple structure compounds facilitate the formation of complex DOM fluorescence substances during composting.
• The combined EEM/PARAFAC and 2DCOS approach effectively tracks DOM PARAFAC component evolution.
• This study provides insights into humification processes in composting organic matter.