Photo AI
An analytical chemist was using atomic absorption spectroscopy (AAS) to determine the manganese concentration in a sample - HSC - SSCE Chemistry - Question 4 - 2022 - Paper 1
Question 4
An analytical chemist was using atomic absorption spectroscopy (AAS) to determine the manganese concentration in a sample. The following diagram shows the absorbanc... show full transcript
Worked Solution & Example Answer:An analytical chemist was using atomic absorption spectroscopy (AAS) to determine the manganese concentration in a sample - HSC - SSCE Chemistry - Question 4 - 2022 - Paper 1
Step 1
Which lamp should be used to determine the manganese concentration in the sample?
Answer
To determine the concentration of manganese using atomic absorption spectroscopy (AAS), we need to choose a lamp whose emission spectrum overlaps with the absorbance lines of manganese. From the provided absorbance diagram, the critical wavelengths for manganese absorption fall within a certain range.
Upon examining the emission spectra of the four lamps:
- Lamp A: The emission does not match the desired wavelengths since it lacks the required peaks.
- Lamp B: Similarly insufficient in matching the manganese absorption lines.
- Lamp C: This lamp shows emission lines that coincide perfectly with the absorbance peaks of manganese, making it suitable for the analysis.
- Lamp D: Does not provide the necessary spectral overlap required for effective absorption measurement.
Thus, the lamp that should be used to determine the manganese concentration in the sample is Lamp C.