Sample interview questions: Can you discuss your familiarity with different types of analytical standards and reference materials?
Sample answer:
- Primary standards: These are compounds that are highly pure and stable, and that have accurately known compositions. They are used to calibrate other standards and to perform titrations. Examples of primary standards include sodium chloride, potassium hydrogen phthalate, and benzoic acid.
- Secondary standards: These are compounds that are not as pure or stable as primary standards, but that are still suitable for use in analytical methods. They are often calibrated against primary standards. Examples of secondary standards include sodium carbonate, potassium dichromate, and silver nitrate.
- Reference materials: These are materials that have been characterized for one or more specific properties, such as purity, composition, or physical properties. They are used to check the accuracy and precision of analytical methods. Examples of reference materials include NIST standard reference materials, certified reference materials, and in-house reference materials.
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