Sample interview questions: How would you handle the analysis of toxic elements in food samples using atomic spectroscopy?
Sample answer:
Atomic Spectroscopy Analysis of Toxic Elements in Food Samples
Sample Preparation:
* Select representative samples to ensure a comprehensive analysis.
* Pre-treat samples using appropriate techniques such as digestion, filtration, or extraction to remove matrix interferences.
Instrumentation:
* Use an atomic absorption spectrometer (AAS) or inductively coupled plasma (ICP) spectrometer with appropriate excitation sources (e.g., flame, graphite furnace, ICP).
* Optimize instrument settings for sensitivity, linearity, and accuracy.
Calibration:
* Prepare calibration standards with known concentrations of the target toxic elements.
* Use curves or equations derived from calibration standards to quantify element concentrations in samples.
* Include quality control samples to verify accuracy and precision.
Analysis:
* Aspirate or introduce prepared samples into the spectrometer.
* Measure the absorbance or emission signals at specific wavelengths corresponding to the target elements.
* Quantify element concentrations using calibration curves.
Data Interpretation:
* Compare analytical results to established regulatory limits or guidelines.
* Consider … Read full answer
Source: https://hireabo.com/job/5_0_29/Atomic%20Spectroscopist