Detection of perchlorate using Ag/DMAH(+) SERS-active capture matrices.

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Perchlorate detection is crucial for environmental monitoring and water safety.
• Existing methods for perchlorate detection can suffer from interference and lack sensitivity.
• Development of novel, selective, and sensitive detection platforms is needed.

Purpose of the Study:

• To fabricate and characterize Surface-Enhanced Raman Spectroscopy (SERS)-active capture matrices for perchlorate detection.
• To evaluate the selectivity and sensitivity of the developed matrices for perchlorate.
• To explore the potential of these matrices in flow-based detection systems and assess interference mitigation strategies.

Main Methods:

• Amine-modified magnetic microparticles were functionalized with silver colloidal particles.
• A self-assembled monolayer (SAM) of dimethylaminoethanethiol hydrochloride (DMAH+) was formed on the silver surface.
• SERS measurements were performed to quantify perchlorate.
• Flow experiments were conducted using magnetic capture matrices.
• Solid phase extraction (SPE) was investigated for chloride ion interference removal.

Main Results:

• The fabricated Ag/DMAH+ matrices demonstrated good selectivity for perchlorate.
• Calibration curves were successfully generated by ratioing SERS peaks.
• Flow experiments showed instantaneous response to perchlorate concentration changes.
• The potential for mitigating chloride ion interference using SPE was explored.

Conclusions:

• The developed SERS-active capture matrices provide a promising platform for selective and sensitive perchlorate detection.
• The instantaneous response in flow systems highlights their utility for real-time monitoring.
• Further optimization of SPE could enhance the robustness of the detection method in complex matrices.