Section 3 was where things got interesting: List three spectral interferences and two chemical interferences that could cause false low results.

“Section 1: Calibration Curve,” she read aloud, her breath fogging her safety glasses. On the worksheet, it was a simple instruction: Plot absorbance vs. concentration for lead standards (0.5, 1.0, 2.0 ppm).

Outside, the Meridian River glowed silver under the moon. Tomorrow, the truth would finally absorb the light.

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