Saroj Panda

Publications (18) View all

• Article: Fourier transform ion cyclotron resonance mass spectrometry in the speciation of high molecular weight sulfur heterocycles in vacuum gas oils of different boiling ranges.

  Saroj K Panda, Wolfgang Schrader, Jan T Andersson
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  ABSTRACT: The analysis of sulfur aromatics in vacuum gas oils (VGO) distilled from an Iranian light crude oil is discussed. The VGOs were fractionated into three boiling ranges, 390-460, 460-520, and 520-550 degrees C, and were analyzed using liquid chromatographic separation on a Pd(II)-bonded stationary phase followed by identification with electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). It was possible to detect a large number of thiophenes, including a substantial number of isomers, in the three VGO fractions. Separation on the palladium phase and inclusion of sulfur-selective derivatization makes electrospray ionization of these nonpolar compounds possible. An elemental composition can be assigned to a large number of S(1) compounds without ambiguity in the presence of abundant hydrocarbons. With an increase in boiling temperature, an increase in the size of the aromatic system and the number of side chain carbon atoms was observed. In addition, the masses of higher magnitude shifted toward larger aromatic systems with an increase in boiling range. A comparison of FT-ICR MS and comprehensive gas chromatography is also given.
  Analytical and Bioanalytical Chemistry 09/2008; 392(5):839-48. · 3.78 Impact Factor
• Article: High-molecular weight sulfur-containing aromatics refractory to weathering as determined by Fourier transform ion cyclotron resonance mass spectrometry.

  Abdelrahman H Hegazi, Eiman M Fathalla, Saroj K Panda, Wolfgang Schrader, Jan T Andersson
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  ABSTRACT: Biomarkers and low-molecular weight polyaromatic compounds have been extensively studied for their fate in the environment. They are used for oil spill source identification and monitoring of weathering and degradation processes. However, in some cases, the absence or presence of very low concentration of such components restricts the access of information to spill source. Here we followed the resistance of high-molecular weight sulfur-containing aromatics to the simulated weathering condition of North Sea crude oil by ultra high-resolution Fourier transform ion cyclotron resonance mass spectrometry. The sulfur aromatics in North Sea crude having double bond equivalents (DBE) from 6 to 14 with a mass range 188-674Da were less influenced even after 6 months artificial weathering. Moreover, the ratio of dibenzothiophenes (DBE 9)/naphthenodibenzothiophenes (DBE 10) was 1.30 and 1.36 in crude oil and 6 months weathered sample, respectively reflecting its weathering stability. It also showed some differences within other oils. Hence, this ratio can be used as a marker of the studied crude and accordingly may be applied for spilled oil source identification in such instances where the light components have already been lost due to environmental influences.
  Chemosphere 05/2012; 89(3):205-12. · 3.21 Impact Factor
• Article: Characterization of supercomplex crude oil mixtures: what is really in there?

  Saroj K Panda, Jan T Andersson, Wolfgang Schrader
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  ABSTRACT: Through different windows: One major obstacle in energy research is the complexity and variety of compounds present in crude oil. A study of different ionization methods for mass spectrometry shows that the mass spectrum very strongly depends on which method is used.
  Angewandte Chemie International Edition 02/2009; 48(10):1788-91. · 13.45 Impact Factor
• Article: Characterization of non-polar aromatic hydrocarbons in crude oil using atmospheric pressure laser ionization and Fourier transform ion cyclotron resonance mass spectrometry (APLI FT-ICR MS).

  Wolfgang Schrader, Saroj K Panda, Klaus J Brockmann, Thorsten Benter
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  ABSTRACT: We report on the successful application of the recently introduced atmospheric pressure laser ionization (APLI) method as a novel tool for the analysis of crude oil and its components. Using Fourier transform ion cyclotron resonance mass spectrometry, unambiguous determination of key compounds in this complex matrix with unprecedented sensitivity is presented.
  The Analyst 08/2008; 133(7):867-9. · 4.23 Impact Factor
• Article: Mass-spectrometric analysis of complex volatile and nonvolatile crude oil components: a challenge.

  Saroj K Panda, Jan T Andersson, Wolfgang Schrader
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  ABSTRACT: Crude oil analysis has long been an inspiration for the development of analytical techniques. Especially mass spectrometry has flourished as a result of the challenge these extremely complex problems offer. Here an overview of different analytical methods is presented that shows different ways to analyze volatile and nonvolatile crude oil components. Focus has been placed on the use of mass spectrometry and especially the new developments that have been introduced using the emerging technique of Fourier transform ion cyclotron resonance mass spectrometry. These studies are examples of how far the development of analytical methods has come for the task of studying such complex problems.
  Analytical and Bioanalytical Chemistry 12/2007; 389(5):1329-39. · 3.78 Impact Factor