Discussion
Consider the following pairs of quantity and its definition.
Characteristic concentration - Gives one per cent absorption
Detection limit - Signal three times the blank's noise
Linear range - Where absorbance is proportional to concentration
Sensitivity - The lowest concentration measurable
How many of the pairs given above are correctly matched?
Answer: C
The first three are correct and the fourth confuses two ideas: sensitivity is the slope of the calibration, how much signal a concentration produces, while the lowest measurable concentration is the detection limit. Two instruments of equal sensitivity can differ widely in detection limit if one is noisier. Keeping slope and noise separate is what lets an improvement be attributed to the right cause. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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