Sample interview questions: How would you approach the analysis of isotopic fractionation in ancient samples using atomic spectroscopy techniques?
Sample answer:
1. Sample Preparation:
– Carefully handle the ancient samples to avoid contamination.
– Clean and pretreat samples to remove impurities and interferences.
– Ensure sample homogeneity to achieve representative measurements.
2. Element/Isotope Selection:
– Choose elements or isotopes that are relevant to the research question.
– Consider elements with significant isotopic variations or elements crucial to the sample’s composition.
3. Atomic Spectroscopy Technique Selection:
– Opt for techniques that provide high sensitivity and accuracy for isotopic analysis.
– Techniques like Inductively Coupled Plasma Mass Spectrometry (ICP-MS) or Laser Ablation ICP-MS are commonly used.
– Evaluate the detection limits and precision of the chosen technique for the specific elements/isotopes of interest.
4. Calibration and Standardization:
– Use well-characterized isotopic standards for calibration to ensure accuracy.
– Prepare calibration curves covering the expected isotopic range of the samples.
– Perform regular calibration checks to monitor instrument stability and minimize drift.
5. Data Acquisition and Processing:
– Collect high-qualit… Read full answer
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