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© macmillan learning a sample of drinking water was tested for pb2 pb2 and was found to have a pb2 pb2 concentration of 17.46 ppb.17.46 ppb. a 9.00 ml9.00 ml sample of the drinking water was spiked with 1.00 ml1.00 ml of a 2.28 ppb2.28 ppb pb2 pb2 standard. analysis of the spiked sample gave a concentration of 15.91 ppb15.91 ppb pb2 .pb2 . find the percent recovery of the spike.

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