Atomic emission measurements were made to deter mine sodium in a blood serum sample. The following emission intensities were obtained for standards of 5.0 and 10.0 ng/mL and for the serum sample. All emission intensities were corrected for any blank emission. The mean value for the blank intensity (cNa = 0.0) was 0.000 with a standard deviation of 0.0071 (arbitrary units).
cNa, ng/mL | Emission Intensity |
5 | 0.51 |
5 | 0.49 |
5 | 0.48 |
10 | 1.02 |
10 | 1 |
10 | 0.99 |
Serum | 0.71 |
Serum | 0.77 |
Serum | 0.78 |
(a) Find the mean emission intensity values for the 5.0- and 10.0-ng/mL standards and for the serum sample. Find the standard deviations of these values.
(b) Find the least squares best line through the points at cNa = 0.0, 5.0, and 10.0 ng/mL. Find the calibration sensitivity and the analytical sensitivity.
*(c) Find the detection limit for k values of 2 and 3. To what level of confidence do these correspond?
(d) Find the concentration of Na in the serum sample and the standard deviation of the concentration.
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