Integrated microfluidic platforms for heavy metal sensing: a comprehensive review.

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• Heavy metals, essential in trace amounts, become toxic pollutants due to anthropogenic activities like mining and industrial waste disposal.
• Conventional heavy metal detection methods (e.g., ICP-MS) are accurate but costly, time-consuming, and require specialized expertise.
• Microfluidic devices present a promising alternative for rapid, cost-efficient, and on-site heavy metal monitoring.

Purpose of the Study:

• To review the application of microfluidic devices for detecting toxic heavy metals.
• To highlight colorimetry, optical, and electrochemical detection techniques within microfluidic platforms.
• To discuss modifications aimed at improving the limit of detection (LOD) for heavy metals.

Main Methods:

• Review of scientific literature on microfluidic-based heavy metal detection.
• Analysis of colorimetric, optical, and electrochemical sensing strategies integrated into microfluidic systems.
• Evaluation of material choices and fabrication methods for cost-effective microfluidic devices.

Main Results:

• Microfluidic devices enable sensitive, rapid, and portable detection of heavy metals such as mercury (Hg), cadmium (Cd), lead (Pb), and arsenic (As).
• Integration of colorimetry, optical, and electrochemical methods on microfluidic platforms enhances detection efficiency and reduces costs.
• Advancements in microfluidic design and materials improve the limit of detection (LOD), making them suitable for real-time environmental monitoring.

Conclusions:

• Microfluidic technology offers a significant advancement over conventional methods for heavy metal detection.
• The development of low-cost, user-friendly microfluidic devices facilitates widespread environmental monitoring.
• Further research into microfluidic sensor modifications can lead to even lower detection limits and broader applicability.