The following atomic absorption results were obtained or determinations of Zn in multivitamin tablets. All absorbance values are corrected for the appropriate reagent blank (czn = 0.0 ng/mL). The mean value for the blank was 0.0000 with a standard deviation of 0.0047 absorbance units.
cZn., ng/mL | A |
5 | 0.0519 |
5 | 0.0463 |
5 | 0.0485 |
10 | 0.098 |
10 | 0.1033 |
10 | 0.0925 |
Tablet sample | 0.0672 |
Tablet sample | 0.0614 |
Tablet sample | 0.0661 |
(a) Find the mean absorbance values for the 5.0- and 10.0-ng/mL standards and for the tablet sample. Find the standard deviations of these values.
(b) Find the least-squares best line through the points at cZn = 0.0, 5.0, and 10.0 ng/mL. Find the calibration sensitivity and the analytical sensitivity.
(c) Find the detection limit for a k value of 3. To what level of confidence does this correspond?
(d) Find the concentration of Zn in the tablet sample and the standard deviation in the concentration.
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