Exp 8.1 - Atomic Spectrometry Absorption Mode Calcium in...

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Atomic Spectrometry Absorption Mode Calcium in Dry Cereal 5/19/2010 AA analysis of dry cereal 1
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hen doing this experiment When doing this experiment… eat the cereal as chemical … DO NOT TASTE/EAT treat the cereal as chemical … DO NOT TASTE/EAT it!!! • work in groups as designated by your TA. gp g y y • be an active participant. e data is shared within a group but each member in the data is shared within a group but each member in a group must write his/her own report. •m a k e sure all relevant information is included in your esue eev o o s cuded you notebook before leaving the lab. 5/19/2010 AA analysis of dry cereal 2
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rimary Paper Primary Paper “Determination of Calcium in Cereal with Flame Atomic Absorption Spectroscopy” Ali Bazzi, Bette Kreuz, and Jeffrey Fischer Journal of Chemical Education volume 81, 1042 (2004) Study this paper carefully before working on the prelab problems. 5/19/2010 AA analysis of dry cereal 3
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relab Problem 1 Prelab Problem 1 Cheerios sample data is given in the paper (Table 3, p1043) S a m p l e 123 A v e r a g e Absorbance Measrurements Blank 0.000 0.000 0.000 0.000 Unspiked 1 0.134 0.134 0.133 0.134 Spiked 1 0.682 0.680 0.678 0.680 Unspiked 2 0.134 0.134 0.133 0.134 Spiked 2 0.696 0.694 0.698 0.696 nspiked 3 130 131 Unspiked 3 0.130 0.131 0.131 0.131 Spiked 3 0.673 0.665 0.666 0.668 5/19/2010 AA analysis of dry cereal 4
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relab Problem 1 nt. Prelab Problem 1 cont. Use equation (1) and (2), (/)( ) ( / ) ... (1) () ( ) sam std std sam sam std sam sam A Cg m L V m L m L AA V m L /) 1 0 0 ( ) g mL mL (/) (/ ) . . . ( 2 ) sam ppmCa C g mass of cereal sample g (a) calculate C sam , C ppmCa using spike1, unspike1, and blank data Ans. C sam = 19.6, C ppmCa = 3914 . (b) find the mean, SD and RSD(%) of C ppmCa (Use spreadsheet). pp Ans. Mean = 3870, SD = 58, RSD(%) = 1.52 (c) explain whether the numbers you have calculated make sense . 5/19/2010 AA analysis of dry cereal 5
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relab Problem 2 Prelab Problem 2 In the paper, A sam+std =0.0282V std + 0.1584 is obtained for Cheerios using multiple standard addition method. Based on this equation and equation (3), calculate C ppmCa for a typical two increment standard addition approach. Comment on the validity of the result. Ans. 4508 5/19/2010 AA analysis of dry cereal 6
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xperimental Experimental Use the following procedure when doing this experiment. In the report, write the procedure in narrative format.
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This note was uploaded on 06/02/2011 for the course CHEM 100A taught by Professor Dai during the Winter '06 term at UCSD.

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Exp 8.1 - Atomic Spectrometry Absorption Mode Calcium in...

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