State hair for subsequent injection into a gas chromatograph

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Reference no: EM13564270

A new method is devised to extract marijuana from hair for subsequent injection into a gas chromatograph.

An external calibration curve determined an unknown hair sample to contain 0.53 ng/g marijuana in hair.

A replicate portion of hair was spiked to 0.61 ng/g.

Analysis of the spike sample gave a concentration of 1.08 ng/g.

What is the percent recovery of the method (to the nearest 1%)?

Reference no: EM13564270

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