Development of a Novel Mass Spectrometric ... - Jacobs University

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Results and Discussion Instant inspection of the figures confirms oxidation yield is very high and this is supported by the huge shift in the mass distribution in the positive APCI-MS spectrum of the waste sample after oxidation. Also positive and negative ion mode ESI-TOF-MS spectra were acquired for the oxidation products as shown in figures 3-51 and 3-52. This suggested that other nonreacted products can be differentiated from those in APCI-MS because nonreacted species can only ionise upon APCI source. Next, molecular assignment for oxidation product in both ESI and APCI spectra was performed. The molecular formulas suggest carboxylic and ketone groups are present. However, this oxidation process alone can not give that insight about the source of these products. A model hydrocarbon complex mixture was designed and prepared. The model mixture consisted of linear alkanes such as C20, C21, C23, C26, C32, C36 and C40 as well as from few other standards 5-αcholestane, squalane and squalene. These compounds were subjected to oxidation with chromium trioxide using the same procedure performed for the complex mixture of the waste extract. The products of this model complex mixture were measured by ESI-TOF-MS in both positive and negative modes. Figure 3-53 shows the negative ESI MS spectrum of model mixture of hydrocarbons. Comparing the latter spectrum to the negative ESI mass spectrum of oxidation products of the waste sample mixture demonstrated a dramatic resemblance. It was clearly observed that products of the model mixture are among the products of the complex mixture of the waste sample. This suggested that the complex mixture composition is composed or at least contains compounds similar to the ones within the model mixture. This was emphasized from the oxidation of representative hydrocarbons which supported these suggestions. Oxidative degradation does provide some useful additional information about the complex mixture composition. After direct and indirect exploring of the complex hydrocarbon mixture within the light shredder waste fraction, a quantitative figure is discussed in the following section. 81
Results and Discussion Intens. [%] 100 349.2 393.2 +MS 80 305.2 377.2 437.2 60 265.2 323.2 421.2 481.3 40 465.2 525.3 20 569.3 613.3 0 200 250 300 350 400 450 500 550 600 650 m/z Figure 3-51 Positive ESI mass spectrum of complex waste mixture after oxidation Intens. [%] 100 215.6 -MS 80 60 171.5 40 20 0 150 200 250 300 350 400 450 500 550 m/z Figure 3-52 Negative ESI mass spectrum of complex waste mixture after oxidation 82
Page 1 and 2:
Development of a Novel Mass Spectro
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Declaration of Authorship I ,Nadim
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This work has been carried out unde
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Contents Contents Declaration of Au
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List of Figures List of Figures Fig
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List of Figures Figure 3-39 MS 2 fr
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List of Tables List of Tables Table
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Abbreviations Abbreviations APCI AP
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Abbreviations UV VGOs VOCs VRs ultr
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Introduction Analytical chemistry h
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Introduction 1.2 Presence and Fate
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Introduction aliphatic hydrocarbons
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Introduction Figure 1-1 Examples of
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Introduction Figure 1-2 Range of io
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Introduction fractions. 42 Another
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Introduction 1.3.5 APLI Other crude
Page 33 and 34:
Introduction products). Other molec
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Introduction Other studies performe
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Introduction APLI-FT ICR-MS Crude o
Page 39 and 40:
Introduction spectrometry in as muc
Page 41 and 42:
Introduction catalytic processing t
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Introduction Figure 1-6 Kendrick ma
Page 45 and 46:
Introduction including determinatio
Page 47 and 48: Introduction 1.5 Scope and Signific
Page 49 and 50: Experimental e) Other model mixture
Page 51 and 52: Experimental 2.2.2 Preparation of O
Page 53 and 54: Experimental 2.4 Graphical Presenta
Page 55 and 56: Results and Discussion experiment.
Page 57 and 58: Results and Discussion Intens. [%]
Page 59 and 60: Results and Discussion common featu
Page 61 and 62: Results and Discussion 3.2 APCI-TOF
Page 63 and 64: Results and Discussion These compou
Page 67 and 68: Results and Discussion Ions were pr
Page 71 and 72: Results and Discussion procedure ba
Page 75 and 76: Results and Discussion to produce m
Page 77 and 78: Results and Discussion 519.5863 519
Page 79 and 80: Results and Discussion Higher mass
Page 87 and 88: Results and Discussion isolated fro
Page 93 and 94: Results and Discussion 3.4.5 Tandem
Page 97: Results and Discussion injected int
Page 101 and 102: Results and Discussion 3.4.8 Quanti
Page 103 and 104: Results and Discussion Int. x 10000
Page 105 and 106: Results and Discussion Table 3.6 Qu
Page 107 and 108: Results and Discussion assessment o
Page 109 and 110: Results and Discussion hydrocarbons
Page 117 and 118: Results and Discussion of n-alkanes
Page 119 and 120: Results and Discussion flow (in I2)
Page 121 and 122: Results and Discussion Other intere
Page 123 and 124: Results and Discussion Figure 3-80
Page 125 and 126: Results and Discussion KMD 2.4 2.2
Page 127 and 128: Results and Discussion KMD 1.1 1 Le
Page 129 and 130: Results and Discussion 3.6.4 Asphal
Page 131 and 132: Conclusions In conclusion we could
Page 133 and 134: References References 1. Fay, R. M.
Page 135 and 136: References 23. Colavecchia, M. V.,
Page 137 and 138: References 47. Dzidic, I., Petersen
Page 139 and 140: References Hydroconversion Processe
Page 141 and 142: References 91. Golovlev, V. V., All
Page 143 and 144: Appendix Light shredder waste Meas.
Page 145 and 146: 419.4592 C 30 H 59 419.4611 4.6 421
Page 147 and 148: Liqui Moly car motor oil Meas. m/z
Page 149 and 150:
345.3511 C 25 H 45 345.3516 1.5 349
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