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Question 1 of 7

Standard addition graph. Tooth enamel consists mainly of the mineral calcium hydroxyapatite, Ca, (PO)(OH)₂. Trace

elements in teeth of archeological specimens provide anthropologist with clues about diet and diseases of ancient people.

Students at Hamline University used atomic absorption spectroscopy to measure strontium in enamel from extracted wisdom

teeth. Solutions were prepared as in Figure 5-8 with a constant total volume of 10.0 mL containing 0.733 mg of dissolved tooth

enamel plus variable concentrations of added Sr.

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

Pace Sun

in each f

A5, 10, 15 and 20 v

of standard to the five ass

Add to

Attempt 1

achat

-PG

Mary, QChemical Analysis, 10 © 2000 WH Freeman and Company

IN-

Figure 5-8 Standard addition experiment with conto total volane. Pot fx.s verses [5]

and the x-interceptis -[X]

Prepare a standard addition graph appropriate for this standard addition experiment. Report the R² value of the standard

addition graph.

Question Source: Quantitative Chemical Analysis 10e | Publisher: WH Freeman/n/n