Atomic Absorption Spectrometry

Atomic Absorption Spectrometry - Abstract The focus of this...

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Abstract The focus of this experiment was to determine which type of bananas offered the best solution to the United States growing adolescent hypertension epidemic. An AA- 6200 Shimadzu Atomic Absorption Spectrometer was used to calculate the concentrations of both magnesium and potassium in 8 samples (4 types) of bananas. Bananas were chosen because both have been cited as good sources of potassium and magnesium. These minerals have been linked to decrease hypertension. Atomic Absorption Spectrometry was used because it was the most convenient as time was a factor in our report. The results showed that the organic turbana and dole samples offered the best solution for obtaining the daily amount of suggested potassium. Results for magnesium were inconclusive because we concluded that magnesium was not easily digested into the acid and stayed in the solid organic material filtered out during sample preparation. Introduction Recent studies have shown that hypertension amongst children in the United States is on the rise and the need for early diet intervention is becoming more popular. 1 A study states that as many as 38 % of U.S. children have elevated blood pressure and thus an increased chance of organ damage. 2 Many health experts encourage high diets of fruits and vegetables and to decrease their dependency on sodium. 3 The question many ask is what is in fruits and vegetables that lowers ones blood pressure? One health expert, Dr. Julian Whitaker, M.D, states that diets rich in magnesium and potassium will
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significantly lower the risk of hypertension. 4 Nutritional experts recommend 4-6 grams of potassium and 300-500 mg of magnesium be consumed per day. 4 A particular fruit in particular, bananas, contains high levels of both potassium and magnesium and will be the focus of this report to determine which type of bananas gives the consumer the best amount of these minerals. Atomic Absorption Spectrometry (AAS) is the most widely used method for single element identification in compounds. It is based off the principle that “matter absorbs light at the same light that it emits light” (Kirchoff). This means that atoms in the ground state absorb the same light that they emit in an excited state. Also, each element has a particular radiation wavelength associated with it and allows for easy characterization by measuring the energy differences between the ground and excited states of its’ electrons. As the name implies, atomization of the element in question is essential for AAS. Flame atomization and electrothermal atomization are two different methods for his procedure. Flame atomization is where a solution of sample is broken into an aerosol by a nebulizer where the gas flow can transform the sample into droplets that can be burned in a flame. The burning of the analyte produces an atomic gas. A beam of light produced by a cathode lamp characteristic of the analyte in question is shined through the atomic gas
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This note was uploaded on 09/22/2008 for the course CHEM 480 taught by Professor Chen during the Spring '08 term at University of Michigan.

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Atomic Absorption Spectrometry - Abstract The focus of this...

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