Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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plot of concentration (Ci , ppm) vs. absorbance (A) gave the following equation for the calibration curve:
y = 0.051x + 0.003 ; where y = absorbance and x = concentration Ci.
A solution of a 10.0 ppm standard gave the following absorbance for 5 replicate measurements:
0.512 0.551 0.449 0.495 0.507
Answer the following:
What is the calibration sensitivity for this analysis:
Calibratation sensitivity = ________ (report result to three decimal places with no
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- Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Can(PO)(OH). Trace elements in teeth of archeological specimens provide anthropologists with clues about diet and disease of ancient people. Students at Hamline University measured the trace element strontium in cnamel from extract wisdom teeth by atomic absorption spectroscopy. Solutions were prepared with a constant total volume of 10.0mL. containing 0.750mg dissolved tooth enamel plus variable concentration of added Sr. \table[[Added Sr (ng/mL- ppb), Signal (arbitrary units)], [0, 28.0], [2.50, 34.3], [5.00, 42.8], [7.50, 51.5], [10.00, 58.6]] a) Prepare a graph to find the concentration of Sr in the 10mL sample solution in part per billion = n m L. (2%) b) Find the concentration of Sr in tooth enamel in part per million = μ (3%) 5. Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca(PO)(OH). Trace elements in teeth of archeological specimens provide anthropologists with clues about diet and…arrow_forwardWhat FeNCS2+concentrations in solutions 1 through 6 are used for the calibration curve?arrow_forward
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