Pure water containing no arsenic was spiked with, Chemistry

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Pure water containing no arsenic was spiked with

Pure water containing no arsenic was spiked with .40micrograms arsenate/L. Seven replicate determination gave .39 ,.40, .39, .41, .36, .35,.and .39 microgram/L. Find the mean percent recovery of the spike and the concentration detection limit (microgram/L)

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