Unformatted text preview: groundwater sample as the matrix spike and acid digested. The Pb concentration measured by ICP-MS was 0.095 mg/L after a tenfold dilution. Calculate the percentage recovery. 7. Explain what type of laboratory QC samples should be used in the following cases: a. To determine the effect of matrix interferences on analytical accuracy of a sample b. To determine the analytical precision of a sample batch c. To determine whether memory (carryover) effects are present in an analytical run with an instrument. d. To establish that laboratory contamination does not cause false positives e. To know whether an extraction procedure is appropriate or not....
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This note was uploaded on 09/26/2011 for the course ES 462 taught by Professor Unc during the Spring '11 term at NMSU.
- Spring '11