Chromatographic fingerprint similarity analysis for pollutant source identification

Area of Science:

• Environmental Chemistry
• Analytical Chemistry

Background:

• Polybrominated diphenyl ethers (PBDEs) are persistent environmental contaminants.
• Chromatographic fingerprint analysis is established in other fields but underutilized in environmental science.

Purpose of the Study:

• To develop and apply a similarity analysis method for evaluating contaminant source-sink relationships.
• To assess the contribution of plastic waste to PBDE contamination in environmental matrices.

Main Methods:

• Established a library of contaminant profiles from various sources, including plastics.
• Utilized chromatographic fingerprint analysis and cosine similarity to compare environmental samples (soil, sediment) with the library.
• Developed a data matrix of peaks and relative levels for similarity analysis.

Main Results:

• Plastic from electronic waste was identified as a significant, though not exclusive, source of PBDEs.
• A source-sink relationship was found between soil and sediment based on similarity analysis.
• The method effectively captured complex mixture information beyond target pollutants.

Conclusions:

• Similarity analysis is a valuable tool for environmental source tracking of complex chemical mixtures.
• This approach facilitates contaminant source identification without full quantitative or qualitative analysis.
• Understanding source-sink dynamics is crucial for managing PBDE contamination.