A315experimentoverviews090209

A315experimentoverviews090209 - 1 A315 experiment overviews...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9/2/2009 1 A315 experiment overviews Fall 2009 9/2/09 Atomic Absorption Spectroscopy for the Determination o for the Determination of Calcium, Magnesium & Iron in Multivitamins 9/2/2009 2 Atomic Energy Levels Na atoms Ionization Potential 5 4 5 s 6 s 4 d 5 p 5 p 5 d 7 s 6 p 6 p Energy, eV 1 2 3 3 p 3 p 4 s 4 p 4 p 3 d Energy of p orbitals slightly different – e ‐ orbital motion opposite e ‐ spin lowers energy λ in nm (nm = 10 Å) 3 s opposite e spin lowers energy Some transitions (4 s Æ 3 s , 5 s Æ 3 s ) are “forbidden” & not observed Sample Atomization ‐ General Analyte Solution Spray Solid/gas aerosol Gaseous molecules Atoms Atomic ions Nebulization Desolvation Volatilization Dissociation (reversible Ionization ( i b l (reversible) (reversible) Excited molecules h ν molecular Excited atoms Excited ions h ν ionic h ν atomic Processes occur during atomization in a flame. (Fig. 9 ‐ 1) Height, cm 2.5 5 Absorbance Ag Cr Mg 5 or 10 cm Laminar flow burner 9/2/2009 3 Goals for experiment • Measure Ca, Mg, Fe concentrations in multivitamins using calibration curve • Measure Ca concentrations in one multivitamin using standard addition • Study phosphate interference in calcium measurements • Draw conclusions from the experiments Atomic Absorption Report Grade Sheet Section Points Qualifier 25 Introduction 10 Experimental 20 Results and Discussion Working curves of absorbance vs. concentration 20 Amount of elements in vitamin samples 10 Standard addition plot 10 Results from standard addition experiment...
View Full Document

This note was uploaded on 07/01/2011 for the course A 315 taught by Professor Arnold during the Fall '09 term at Indiana State University .

Page1 / 11

A315experimentoverviews090209 - 1 A315 experiment overviews...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online