A novel micellar medium using triblock copolymer for cobalt determination

Area of Science:

• Analytical Chemistry
• Environmental Chemistry
• Materials Science

Background:

• Traditional methods for cobalt determination often use hazardous organic solvents like chloroform.
• There is a growing need for environmentally friendly analytical techniques in chemical analysis.
• Triblock copolymers offer unique micellar properties suitable for various chemical applications.

Purpose of the Study:

• To develop and validate a novel, environmentally friendly method for determining cobalt(II) ions.
• To utilize a biodegradable triblock copolymer as a micellar medium, replacing hazardous solvents.
• To optimize experimental parameters for enhanced cobalt complexation and detection.

Main Methods:

• Formation of a cobalt-1-nitroso-2-naphthol complex within a micellar solution.
• Utilizing a triblock copolymer composed of polyethylene oxide (PEO) and polypropylene oxide (PPO) as the micellar medium.
• Optimization of critical parameters including pH, copolymer molecular weight, and PEO/PPO ratio.

Main Results:

• The novel method demonstrated excellent agreement with established atomic absorption spectrometry techniques for cobalt determination in vitamin samples.
• Achieved high precision with a relative standard deviation of 1.0% for a 0.125 mg L(-1) Co solution.
• Reported a low detection limit of 13.3 µg L(-1) and a quantification limit of 44.3 µg L(-1).

Conclusions:

• The proposed triblock copolymer-based micellar medium provides a viable, eco-friendly alternative to chloroform for cobalt analysis.
• The method is robust, precise, and sensitive, suitable for determining cobalt in complex matrices like vitamins.
• This research contributes to the development of greener analytical methodologies in environmental and applied chemistry.