Standard Reference Materials

Abstract

Ratios of standard deviations to average standard deviations for potassium in serum for Round Robin II, semiautomated pipetting protocol.. . 14. Components of standard deviation in mmol/L for all Round Robin II potassium levels (1.3-7.3 mmol/L) 15. Summary of imprecision and bias results in mmol/L for potassium in serum, Round Robin II 16. Summary of potassium in serum values ±2 standard errors 17. Calibration curve data for potassium in serum, Round Robin II using manual pipetting 18. Calibration curve data for potassium in serum, Round Robin II using semiautomated pipetting.. 19. Calibration curve results for potassium in serum as standard deviation of fit (s £^t) i n mmol/L. 20.

Isotope systematics of contaminant leads in Monterey Bay

“…The multiplicity of those lead inputs precluded an unqualified identification of one principal source of contaminant lead with only lead concentration analyses. Therefore, complementary lead isotopic composition analyses were required to confirm the principal source of contaminant lead, utilizing the stable isotope ratio technique (7).…”