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CHY203 -X-Ray Fluorescence lab report
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Filename: CHY203 instumental method of analysis -X-Ray Fluorescence lab report.docx
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Description
CHY 203 Instrumental Methods of Analysis
Transcript
Department of Chemical Engineering
X-Ray Fluorescence
Student name:
Student number:
CHY203, Section 02
Group number: 2
April 17th, 2013
Instructor: David Naranjit
TA: Justin
X-Ray Fluorescence Data & Result Sheet
1. Collection of a Copper Spectrum
Elements
Type of Photon Energy
Experimental line emission (KeV)
Literature line emission (KeV)
Sum Peaks +
Exp. Litre.
% Relative Error
Cu
k
7.99
8.04778
16.88
16.95307
0.72
k
8.89
8.90529
0.17
Sample Calculation of % Error for Cu k :
Relative % Error = [Literature Value-Experimental Photon Value/Literature Value] x 100%
= [8.04778-7.99/8.04778]*100%
= 0.72%
2. Interpretation of a Quality Control Fused Glass Spectrum
Elements
Type of Photon Energy
Experimental line emission (KeV)
Literature line emission (KeV)
Sum Peaks +
Exp. Liter.
% Relative Error
Si
k
1.75
1.73998
3.60
3.57592
0.58
k
1.85
1.83594
0.77
Ca
k
3.66
3.69168
7.68
7.70438
0.86
k
4.02
4.0127
0.18
Mn
k
5.86
5.89875
12.37
12.3892
0.66
k
6.51
6.49045
0.30
As
k
10.55
10.54372
22.25
22.26992
0.060
k
11.70
11.7262
0.22
Mo
k
17.49
17.47934
37.14
37.08764
0.061
k
19.65
19.6083
0.21
Sb
k
26.45
26.3591
56.20
56.0847
0.34
k
29.75
29.7256
0.082
3. Interpretation of Steel Slag Spectrum
Elements
Type of Photon Energy
Experimental line emission (KeV)
Literature line emission (KeV)
% Relative Error
Si
k
1.75
1.73998
0.58
k
1.91
1.83594
4.03
Ca
k
3.67
3.69168
0.59
k
4.02
4.0127
0.18
Mn
k
5.91
5.89875
0.19
k
39179511493500
6.49045
4197351168400
Al
k
1.49
1.48670
0.22
k
3917951003300
1.55745
419735102235
Mg
k
1.26
1.25360
0.51
k
391795850900
1.3022
41973587630
Ti
k
4.53
4.51084
0.42
k
4.95
4.93181
0.37
Cr
k
5.45
5.41472
0.65
k
391795939800
5.94671
41973595885
Fe
k
6.41
6.40384
0.096
k
7.05
7.05798
0.11
Ar
k
2.89
2.95770
2.29
k
3.099
3.1905
2.87
K
k
3.33
3.3138
0.49
k
33845590170
3.5896
41973590170
P
k
2.01
2.0137
0.18
k
33845510985500
2.1391
3721101098550
Cl
k
2.87
2.8156
1.93
3. Interpretation of Cheese Powder Spectrum
Elements
Type of Photon Energy
Experimental line emission (KeV)
Literature line emission (KeV)
% Relative Error
S
k
2.305
2.30784
0.12
k
410845984250
2.46404
46736098425
Cl
k
2.63
2.62239
0.29
k
2.79
2.8156
0.91
K
k
3.30
3.3138
0.42
k
4108457874000
3.5896
46736078740
Ca
k
3.65
3.69168
1.13
k
4.00
4.0127
0.32
Ti
k
4.50
4.51084
0.24
k
4.94
4.93181
0.17
Ne
k
0.86
0.8486
1.34
k
41084591440
436245914400
467360914400
p
k
2.05
2.0137
1.80
k
410845958850
2.1391
46736095885
3. Collection of the Unknown Sample # 9071 Spectrum
Elements
Type of Photon Energy
Experimental line emission (KeV)
Literature line emission (KeV)
Sum Peaks +
Exp. Liter.
% Relative Error
Ar
k
2.99
2.95770
6.15
6.1482
1.09
k
3.16
3.1905
0.96
Co
k
6.90
6.93032
14.55
14.57975
0.44
k
7.65
7.64943
0.0075
Sr
k
14.18
14.165
30.03
30.0007
0.11
k
15.85
15.8357
0.090
Cr
k
5.51
5.41472
11.48
11.36143
1.76
k
5.97
5.94671
0.39
Mg
k
1.18
1.25360
2.49
2.5558
5.87
k
1.31
1.3022
0.60
K
k
3.35
3.3138
6.98
6.9034
1.09
k
3.63
3.5896
1.13
Si
k
1.75
1.73998
1.75
3.57592
0.58
k
334645844550
1.83594
28575084455
Discussion:
1. If a cement sample contains 60% of CaO. Calculate the values of the three sum peaks that are produced at this high concentration.
Ca: k= 3691.68 eV
k= 4012.7 eV
The three sum peaks values are:
Ca k + Ca k= (3691.68 eV) + (3691.68 eV) =7383.36 eV
Ca k + Ca k= (3691.68 eV) + (4012.7 eV) = 7704.38 eV
Ca k + Ca k= (4012.7 eV) + (4012.7 eV) = 8025.4 eV
2. How does the Energy Dispersive X-Ray Fluorescence instrument differ from the Wavelength Dispersive X-Ray instrument in terms of sensitivity, interferences and theory of operation.
The Energy Dispersive X-Ray Fluorescence is an analytical instrument that used to analysis the type of elements present in the sample compounds of interest by measuring the wavelength and intensity of the x-ray radiation energy of the analytic species. EDXRF also has a high energy x-ray tube that used to stimulates the sample molecules as the x-ray beam concentrated on the sample and thus converting the x-ray radiation beam into a pulse as it detected by the silica drift lithium detector. However, the Wavelength Dispersive X-Ray is an instrument that used to measure the wavelength of an element present in the analytical sample by diffracting the photon as it pass through a crystal structure and hence detect by the detector.
Although, EDXRF and WDXRF are effective techniques for analysing an elements in a compound, the wavelength dispersive x-ray fluorescence has a better resolution and hence highly sensitivity than the energy dispersive x-ray fluorescence. Also, the wavelength dispersive x-ray fluorescence has a slightly better interfering than the energy dispersive x-ray fluorescence since the x-ray beams loss it energy as it diffracted by the monochromatic crystal in WDXRF as it pass through the analysing sample which in return cause the EDXRF to have a highly efficiency than the WDXRF. On the other hands, in the theory of operation the EDXRF provides a better respond and ability for analysing an element in the sample than WDXRF since it has Al or Ag filter between the x-ray tube and the analysing sample that reduce the diffraction peaks, the unwanted parts of spectrum, the count rate of high concentration species and hence minimize the background noise that caused by the scattering x-ray beams.
Graphs of Spectrum Analysis:
1. Collection of a Copper Spectrum
2. Interpretation of a Quality Control Fused Glass Spectrum
3. Collection of a Pressed Pellet Unknown Sample 9071 Spectrum
4. Interpretation of a Cheese Powder Spectrum
5. Interpretation of a Steel Slag Spectrum
References:
Instrumental Methods of Analysis Laboratory Manual, X-Ray Fluorescence, X-Ray Fluorescence Spectroscopy, Ryerson University 2013, page 56-72
N. Joseph (editor), Energy Dispersive X-Ray Fluorescence Spectroscopy, Shimadzu, Analytical and Measuring Instruments, 2013.
http://www.shimadzu.com/an/elemental/edxrf/index.html
J. Henry, Comparison of Wavelength Dispersive X-Ray Fluorescence and Energy Dispersive X-Ray Fluorescence Techniques, Rigaku Analytical Chemistry Products,2013
http://www.rigaku.com/products/xrf/primini/app004
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