Discussion
What is the detection limit conventionally defined as?
Answer: D
A signal three times the standard deviation of the blank is the usual criterion for saying an element is present, with ten times required before a number is quoted. The other options describe anecdote, an arbitrary absorbance and the calibration's extent. Two thresholds for two different claims - that something is there, and how much - reflects that the second is much the stronger claim. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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