Kentucky Wastewater Treatment Operator Certification Practice Exam

In analytical testing, what describes the sample in which no analyte is added?

Buffer Blank CBOD Biomass

Correct Answer:

Blank

Explanation:

In analytical testing, a sample with no analyte added is called a blank. It sets the baseline signal and reveals any background contamination from reagents or the instrument, so you can subtract that background from real samples to get accurate measurements. A buffer is just a pH-stabilizing solution, not a zero-analyte sample. CBOD is a measurement type, and biomass refers to microorganisms, neither of which describe a zero-analyte sample.

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