analytical chemistry

A sample is to be analyzed following a prescriptive quality assessment protocol with a detection limit for the method of 0.05ppm. The calibration curve relationship is S means= 0.276X (ppm analyte)

Afield blank is spiked with the analyte to a concentration of 2.27ppm and returned to the lab. Analysis of the spiked field blank gives a signal of 0.57. If the limits for a sucessful spike recovery are +/- 10%, is the result acceptable?

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