Rapid and highly selective dipchecking for cyanide ions in aqueous media

Area of Science:

• Nanomaterials Science
• Analytical Chemistry
• Environmental Science

Background:

• Cyanide detection is crucial for environmental and biological monitoring.
• Existing cyanide detection methods are often complex, costly, and require sophisticated instrumentation.
• There is a need for rapid, portable, and cost-effective cyanide detection techniques, especially for resource-limited settings.

Purpose of the Study:

• To develop a simple dipping method for detecting cyanide ions.
• To utilize chitosan-gold nanoparticle (CH-Au NP) composite films for cyanide detection.
• To provide a rapid, eco-friendly, and low-cost alternative for cyanide monitoring.

Main Methods:

• Preparation of CH-Au NP composite films using chitosan as a reducing and stabilizing agent.
• Exploitation of the gold leaching reaction by cyanide ions.
• Monitoring the decrease in localized surface plasmon resonance (LSPR) peak intensity at 534 nm.
• Visual color change observation for cyanide concentrations above 2 mg L(-1).

Main Results:

• CH-Au NP films exhibited LSPR absorption at 534 nm.
• Dissolution of gold nanoparticles by cyanide ions led to a proportional decrease in LSPR peak intensity.
• A good correlation was found between LSPR peak intensity reduction and cyanide concentrations as low as 0.06 mg L(-1).
• Visual detection of cyanide was possible above 2 mg L(-1).

Conclusions:

• The developed dipping method is rapid, eco-friendly, low-cost, and easy to use for cyanide detection.
• The method demonstrates high selectivity for cyanide ions in aqueous solutions.
• This portable detection technique is particularly suitable for on-site monitoring in regions with limited access to advanced analytical instruments.