Discussion
Two atomisers are compared for the same element.
| Parameter | Flame | Furnace |
|---|---|---|
| Detection limit | 50 ppb | 0.5 ppb |
| Sample used | 5 mL | 20 uL |
| Time per sample | 10 s | 2 min |
Which would suit a large batch of routine samples at 1 ppm?
Answer: B
At one part per million the flame's fifty parts per billion detection limit is ample, and its ten seconds per sample against two minutes decides a large batch outright. The furnace's sensitivity is simply not needed. Both do reach the level, which is why the third option is tempting, but it ignores the throughput column that the question's word batch points at. Choosing the least capable instrument that meets the requirement is what keeps a laboratory productive.
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