Selection of the optimal extraction protocol to investigate the interaction between trace elements and environmental...

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• The interaction between environmental plastics and trace elements is a growing concern.
• Understanding these interactions is crucial for assessing environmental risks.
• Reliable extraction protocols are needed to quantify elements on plastic surfaces and within the plastic matrix.

Purpose of the Study:

• To evaluate the effectiveness of different reagents in mimicking elemental phases bound to meso- and microplastics.
• To investigate the influence of plastic ageing and polymer composition on trace element interactions.
• To propose future steps for developing a tailored extraction scheme for environmental plastics.

Main Methods:

• Testing various reagents to extract trace elements from aged and unaged meso- and microplastics.
• Analyzing the distribution of trace elements in different chemical phases associated with the plastics.
• Comparing extraction efficiencies based on plastic ageing and polymer type.

Main Results:

• A significant portion of trace elements on plastics are associated with a weak bonding phase.
• Phases common in other matrices, such as oxides and organic matter-bound elements, are minimally present in plastic samples.
• Plastic ageing plays a critical role in governing trace element interactions, more so than polymer composition.

Conclusions:

• The study highlights the prevalence of weak bonding for trace elements on environmental plastics.
• Plastic ageing is a key factor influencing trace element association, with polymer type having less impact.
• Further development of extraction schemes is necessary for accurate environmental plastic analysis.