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4 cards from this section. Quick, good the night before a test.
What is a surrogate?
Think about what similar means in this context.
Why do we use hexane in extraction?
Consider the polarity of hexane.
What is the purpose of adding a surrogate to a sample?
Think about what you can use to compare.
True or False: The recovery rate must always be above 100%.
Consider the definition of recovery.
After adding 0.1 mg of a surrogate to your sample and obtaining a recovery rate of 80%, calculate the concentration of the surrogate in the original sample.
Use the recovery formula to trace back to the original concentration.
If an instrument response gives a value of 50,000 units for a sample diluted down to 10 mL from original 100 mL, and the calibration factor is 5,000 units/mg, find the concentration of the analyte in the original sample.
Front-load your calculations properly.
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