Attention Soft Drink Consumers!

Is Phosphorous in Your Beverages Endangering Your

Health?

Health Hazards of Soda

High sugar content

High caffeine content

Phosphoric acid content

So, What’s the Big Deal?

Main Objectivesfind out how much phosphorous in

Coca-Cola productsDoes phosphoric acid contained in soft

drinks increase chances of developing bone disease?

Why Is It Added Then?

According to a Coca-Cola Company Representative

Adds tartness Adds acidity Safe to drink

Contained in most foods

Content of Some Foods

8 oz Coca-cola classic 41mg

10oz Cheddar Cheese 145mg

1 Large Egg 90mg

(Given by representative named “Kim” over the telephone)

Importance of phosphorous

• present in all living cells

• strong bones and teeth

• enzyme activity

• buffer in blood

Reference: (http://sanangelo.tamu.edu/mg/p.htm)

Experimental Method

Molydenum phosphate complex

7H3PO4+ 12 (NH4)6Mo7O2*4H2O

7(NH4)3[PO4(MoO3)12] + 51NH4+ +

51OH- + 33H2O

Reduced by ascorbic acid Spectrophotometrically active-blue

The Quant Part

• Calculations– calibration curve– least squares– ppm of Phosphorous in sample

=20*20*XppmP2O5*(75mgP/142mgP2O)

where Xppm = solve for x in least squares equation.

ResultsSample Absorbance

Sprite 0.006

Coca-Cola 0.573

____________________

Sprite - about 0

Coca-Cola = 137ppm

= 137mg/Lwhich equals about 32mg in 8ozvs lit.

value of 41mg/80z

Literature: 17 mg (amt. in 100 grams)

Standrard Solutions Curve

y = 0.6278x + 0.1667

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

0 0.5 1 1.5 2 2.5

ppm of P2O5

Ab

sorb

an

ce

Conclusion

Sprite contains less than CokeChanges to Journal of Chemical Education

procedureWrap up of information References

www.sanangelo.tamu.edu/mg/p.html

www.thecoca-colacompany.com

www.solopro.com/phosnew.html