Challenges in quantifying and characterizing dissolved organic carbon: Sampling, isolation, storage, and analysis

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Water Quality Analysis

Background:

• Dissolved organic carbon (DOC) plays crucial roles in aquatic ecosystems and water treatment processes.
• Accurate quantification and characterization of DOC are essential but hindered by analytical challenges.
• Understanding DOC variability and properties is vital for water resource management.

Purpose of the Study:

• To review the ecological and engineering roles of DOC across the water continuum.
• To identify limitations and artifacts in current DOC characterization methods.
• To provide recommendations for enhancing analytical accuracy in DOC determination.

Main Methods:

• Literature review of DOC roles, variability, and analytical techniques.
• Analysis of challenges in sampling, isolation, storage, and bulk chemical characterization of DOC.
• Evaluation of advantages and disadvantages of various analytical options.

Main Results:

• DOC influences nutrient cycling, micropollutant fate, buffering capacity, and disinfection byproduct formation.
• Key analytical challenges include spatial-temporal variations, sample stability, and structural uncertainties.
• Current methods for DOC analysis present limitations in accuracy and consistency.

Conclusions:

• Improved analytical strategies are needed for reliable DOC quantification and characterization.
• Addressing challenges in sampling, preservation, and analysis is critical for water quality assessment.
• Recommendations are provided to enhance the accuracy and reliability of DOC measurements.