Atomic emission measurements were made to determine 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 (c_Na = 0.0) was 0.000 with a standard deviation of 0.0071 (arbitrary units).

(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 c_Na = 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.

Transcribed Image Text:

(Na ng/mL Emission Intensity 5.0 0.51 5.0 0.49 5.0 0.48 10.0 1.02 10.0 1.00 10.0 0.99 Serum 0.71 Serum 0.77 Serum 0.78