Discussion
A graphite furnace takes \( 20 \ \mathrm{\mu L} \) of sample. A flame aspirates about \( 5 \ \mathrm{mL} \) per minute. The furnace uses less sample by a factor of about
Answer: C
Comparing the volumes consumed for one reading:
\[ \frac{5 \ \mathrm{mL}}{20 \ \mathrm{\mu L}} = 250 \]
giving about 250, and the furnace is nonetheless the more sensitive of the two because none of its sample is wasted. That a technique can use far less material and still detect far less of the analyte is what makes the furnace indispensable when sample is scarce.
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