Question: Atomic Absorption Spectroscopy We are trying to find out the concentration of Zinc and Iron in 2 unknown samples. We made standards that contain both

Atomic Absorption Spectroscopy We are trying to find out the concentration of Zinc and Iron in 2 unknown samples. We made standards that contain both zinc and iron. Here are their measurements for each element: Zinc: Flask #1 (blank): absorbances: 0, 0, -0.001 Flask #2(1.0 ppm Zn): absorbances: 0.167, 0.168, 0.169 Flask #3(3.0 ppm Zn): absorbances: 0.396, 0.398, 0.396 Flask #4(5.0 ppm Zn): absorbances: 0.510, 0.510, 0.511

Iron: Flask #1 (blank):absorbances: 0, 0, 0 Flask #2 (3.0 ppm Fe):absorbances: 0.102, 0.101, 0.100 Flask #3 (7.0 Fe): absorbances: 0.267, 0.269, 0.267 Flask #4 (10.0 Fe):absorbances: 0.373, 0.374, 0.372

Unknown sample 1 Zinc absorbances: 0.16, 0.158, 0.16 Unknown sample 1 Iron absorbances: 0.032, 0.032, 0.03

Unknown sample 2 Zinc absorbances: 0.106, 0.108, 0.108 Unknown samples 2 Iron absorbances: 0.026, 0.022, 0.026

Please calculate the minumum signal and limit of detection for Zinc and for Iron. What is the concentration of these 2 elements in the 2 samples? Please show calculations.

Textbook Limit of Detection is 0.0005 ppm for Zinc and 0.005 ppm for Iron for reference.

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