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Lab 10- AAS - drops of 6 M HNO 3 and distilled water into...

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Purpose: To analyze copper and zinc ion from a vitamin tablet using Atomic Absorption Spectrophotometry, a calibration plot and the standard addition spike method for copper. Procedure: A vitamin tablet was digested in 25 mL of 8 M HCl into a 150 mL beaker over heat for 10 minutes, after which it was removed from the heat and 1 mL of conc. HNO 3 was added and it was heated again for 10 minutes. The sample was allowed to cool before being vacuum filtered into a 250 mL volumetric flask quantitatively, diluted to the mark and mixed. The sample solution was then diluted into three 50.00 mL vol. flasks with the following volumes of sample solution: 5.00 mL, 500 µL, and 100 µL, and 15 drops of 6 M HNO 3 in each flask. Six standard metals solutions were made from the 100 ppm stock standard, 6
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Unformatted text preview: drops of 6 M HNO 3 , and distilled water into 50.00 mL vol. flasks with the following volumes of standard: 50 µL, 125 µL, 250 µL, 500 µL, 1500 µL, and 2500 µL. The absorbance of Copper and Iron were obtained individually by first aspirating the standard solutions within the elements Limit of Linearity range, and then aspirating the four sample solutions. The sample solution that created the highest Absorbance reading within the LOL for each element was considered. Copper was also analyzed using the Standard Addition method (spike). For every approximate ppm of copper present from the absorbance values, 100 µL of 100 ppm stock standard was added to a 10 mL vol. flask and diluted to make the spike solution. The spike solution was aspirated and the absorbance was recorded....
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