Tetrazine-based dynamic covalent polymers as degradable extraction materials in sample preparation.

Area of Science:

• Analytical Chemistry
• Polymer Science
• Environmental Chemistry

Background:

• Current analytical chemistry trends emphasize selective, high-capacity, and sustainable extraction materials.
• Stimuli-responsive polymers offer a promising avenue, but focus has been on synthesis rather than post-extraction degradability and recyclability.
• There is a need for polymers that degrade into non-toxic fragments or monomers after fulfilling their extraction function.

Purpose of the Study:

• To develop and assess a degradable and recyclable dynamic covalent polymer as a sorbent for extracting persistent organic pollutants (POPs).
• To investigate the polymer's ability to be degraded and its monomers recovered for recycling.
• To contribute to the development of sustainable analytical methodologies by reducing chemical waste.

Main Methods:

• A dynamic covalent polymer utilizing tetrazine as a linker was synthesized.
• A microdispersive solid-phase extraction (µSPE) procedure was developed for POP extraction from water samples.
• Gas chromatography coupled to mass spectrometry (GC-MS) was used for analyte separation, determination, and quantification.
• The polymer's degradability was assessed using the amino acid L-tyrosine.

Main Results:

• The polymer successfully extracted 37 persistent organic pollutants, including polycyclic aromatic hydrocarbons, organochlorine pesticides, and polychlorinated biphenyls, from water samples.
• The optimized µSPE procedure demonstrated good performance with mean relative recovery values between 72% and 112% and relative standard deviations below 18% for seawater and wastewater.
• The polymer was quantitatively degraded upon addition of L-tyrosine, allowing for the recovery of the initial functional monomer.

Conclusions:

• A responsive tetrazine-based polymer serves as an effective sorbent in sample preparation, exhibiting favorable physicochemical properties and post-use degradability.
• This polymer offers a sustainable alternative for reducing chemical waste through monomer recycling.
• The study advances the development of greener analytical methodologies.