Inhomogeneity in epoxy resin standards for quantitative biological X-ray microanalysis

Area of Science:

• Materials Science
• Analytical Chemistry
• Polymer Science

Background:

• Epoxy resins are widely used in various applications.
• Accurate chemical analysis is crucial for quality control and research.
• Non-uniform distribution of elements can affect material properties and analysis.

Purpose of the Study:

• To investigate the distribution of sodium and potassium crown ether complexes in epoxy resin.
• To determine if the distribution is uniform and identify potential concentration gradients.
• To provide recommendations for accurate chemical analysis of such materials.

Main Methods:

• X-ray point analyses were employed to examine elemental distribution.
• Line scans were performed to map concentrations across the epoxy resin.
• Comparison of analyses on intact blocks versus selected central regions.

Main Results:

• Sodium and potassium concentrations, as crown ether complexes, were found to be non-uniformly distributed in epoxy resin.
• Higher concentrations were observed in a thin layer at the base of the analyzed blocks.
• Analysis of the intact block overestimated the true concentration compared to central regions.

Conclusions:

• Chemical analysis of epoxy resins containing sodium and potassium crown ether complexes requires careful consideration of elemental distribution.
• Sampling from a selected central region is recommended for accurate concentration determination.
• While less pronounced, a similar non-uniformity trend was observed with cryptate complexes.