Advancing the application of pXRF for animal samples

Area of Science:

• Environmental Science
• Analytical Chemistry
• Zoology

Background:

• Portable X-ray fluorescence (pXRF) is a valuable tool for rapid, non-destructive elemental analysis.
• Its application in biological studies, particularly with animal samples, requires understanding potential sources of variation.
• Assumptions regarding sample properties can influence data reliability.

Purpose of the Study:

• To evaluate the precision of replicate scans using pXRF on animal samples.
• To determine the impact of sample thickness, state, scan location, and scan time on pXRF data.
• To identify best practices for pXRF analysis in diverse animal taxa.

Main Methods:

• pXRF analysis was conducted on representative species from four taxa: fish, mammals, birds, and reptiles.
• Scans were performed to assess replicate precision, sample thickness effects, and variations due to sample state, location, and duration.
• Infinite thickness assumptions were tested across different body locations and taxa.

Main Results:

• Significant differences in elemental concentration data were observed based on sample state, scan location, and scan time for all taxa.
• Infinite thickness assumptions were met for fish, reptiles, and mammals, but not for feathers.
• Scan times of 40, 60, and 80 seconds generally yielded equivalent results, differing significantly from 20-second scans.
• Replicate scans showed high correlation in concentration data.

Conclusions:

• pXRF is a promising technology for biological studies, offering wide-ranging applications.
• Standardization of sample state, scan location, and scan time is crucial for accurate and reproducible pXRF data from animal samples.
• Careful consideration of these factors ensures data quality and minimizes radiation exposure to live animals.