The worksheet wasn’t just a training tool anymore. It was a roadmap. It had taught her to question the blank, to seek the signal beneath the noise, and to never trust a clear solution without checking for interference.
She glanced at the second section: Digest the sample using a 1:1 nitric acid solution. Filter. Dilute to volume. She had done this. She had taken water from the riverbank, just below the old battery plant. But when she ran the sample through the AAS—that beautiful, humming machine that shattered light into element-specific wavelengths—the result matched the EPA’s lie: 0.48 ppm. Safe.
Outside, the Meridian River glowed silver under the moon. Tomorrow, the truth would finally absorb the light. atomic absorption spectroscopy worksheet
She aspirated the new solution. The hollow cathode lamp for lead flickered to life, shooting a precise violet beam through the flame. The detector chattered. The software plotted a new point.
Not safe. Deadly.
Section 3 was where things got interesting: List three spectral interferences and two chemical interferences that could cause false low results.
But tonight, the curve wasn't for a classroom. It was for the cold case of the Meridian River. For six months, the EPA had claimed the lead levels were safe. Elara suspected a lie. The townspeople were sick. The fish were dying. But the official reports showed a clean, linear slope—a perfect correlation. The worksheet wasn’t just a training tool anymore
The Trace Evidence
Elara didn't write an answer. She printed the new data, stapled the old worksheet to it, and walked to the district attorney’s office. She glanced at the second section: Digest the