Student A ran all her standards through the AAS at a specified C2H2/air flow rate. Just before she was to run her Cu sample, Student B turned down the flow rae of C2H2, thus lowering the flame temperature. Would students' A results of Cu in their sample be high, low or unaffected? Explain your answer.

Answer 1

I presume AAS stands for atomic absorption spectrophotometry.
If the T of the burner goes down (enough), there will be fewer atoms vaporized and fewer atoms available to absorb the energy being transmitted by the light source. Less energy will be absorbed, absorbance will be less and %Cu will be less.

Answer 2

Yes the AAS is atomic absorption spectrophotometry. Also thank you for your explanation.