Deciphering CO2 flux and fluorescent DOM origins in the carbon cycle of Kaptai Lake.

ABSTRACT: This study aimed to assess the current water quality, identify the sources of fluorescent dissolved organic matter (fDOM), and quantify the CO2 flux from Kaptai Lake surface water. A water quality multiparameter analyzer, a membrane-enclosed pCO2 sensor, and a weather monitoring device were deployed to continuously record data over 48 hours to observe daily and spatial shifts. All measured water quality parameters remained within the acceptable limits set by the Department of Environment (DoE). The three-dimensional excitation-emission matrix (3D-EEM) analysis identified distinct fluorophores at peak A (Ex/Em = 245/404 nm), peak M (Ex/Em = 310/404 nm), peak T (Ex/Em = 280/338-346 nm), and peak Tuv (Ex/Em = 230/338-350 nm). Parallel factor analysis (PARAFAC) modelling further resolved these

SUBMITTER: Miah O 

PROVIDER: S-EPMC12617867 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature