Analysis of Trace Heavy Metal in Solution Using Liquid Cathode Glow Discharge Spectroscopy

Area of Science:

• Analytical Chemistry
• Environmental Science
• Spectroscopy

Background:

• Heavy metal pollution from cadmium (Cd) and copper (Cu) presents significant environmental and health concerns.
• Existing detection methods may lack efficiency, portability, or sensitivity for real-time monitoring.
• There is a need for advanced analytical techniques for rapid heavy metal quantification in various water matrices.

Purpose of the Study:

• To develop and optimize an improved atmospheric pressure glow discharge atomic emission spectrometry (APGD-AES) technique.
• To establish a sensitive, portable, and cost-effective method for quantifying Cd and Cu in water samples.
• To evaluate the performance of the APGD-AES method against established techniques like graphite furnace atomic absorption spectrometry (GFAAS).

Main Methods:

• Optimization of APGD-AES parameters including discharge voltage (550 V for Cd, 570 V for Cu), flow rate (3.6 mL/min), and solution pH (1.0).
• Quantification of cadmium and copper in water samples using the optimized APGD-AES system.
• Validation of the method's performance using real-world samples (sewage, tap water) and comparison with GFAAS.

Main Results:

• Achieved low detection limits: 16 µg/L for Cd and 1.3 µg/L for Cu.
• Demonstrated the method's effectiveness in analyzing real water samples, including sewage and tap water.
• Showcased comparable performance to graphite furnace atomic absorption spectrometry (GFAAS).

Conclusions:

• The improved APGD-AES technique is a promising tool for sensitive and precise on-site monitoring of trace heavy metals in water.
• The method's advantages include low energy consumption, high excitation energy, compact design, portability, and cost-efficiency.
• APGD-AES offers a viable alternative for environmental monitoring, ensuring compliance with safety standards for heavy metal levels.