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10. A standard addition analysis was performed to determine the concentration of copper in tap water. Four samples were prepared (see table) with different amounts

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10. A standard addition analysis was performed to determine the concentration of copper in tap water. Four samples were prepared (see table) with different amounts of 600.0ppb copper spike reagent added to each. Each sample was assessed by emission spectroscopy (see table for resulting signals). Based on the data, what is the concentration of copper (ppb) in the tap water

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