PASH Standards
PASH Catalog
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PASH standard solutions

 

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Polycyclic Aromatic Sulfur Heterocycles


Reference Solutions

 

The analytical determination of polycyclic aromatic sulfur heterocycles (PASH) has long suffered from the fact that very few reference compounds have been commercially available until now. Nevertheless PASH are of great importance in several fields such as:

  • geochemistry
  • analysis of fossil fuels and oils
  • environmental chemistry
  • toxicology



1. Geochemistry

The distribution of monomethyldibenzothiophene isomers in crude oil provides information about the source rock of the oil origin 1. Additional information about maturity and age of the oil can be obtained by determining the ratio of the thermodynamically more stable 2- and 3-methyldibenzothiophenes to the thermodynamically less stable 1- and 4-methyldibenzothiophenes 2.




2. Fossil Fuels

The desulfurization of fossil fuels is a most important process in industry. However, while aliphatic sulfur compounds can easily be desulfurized aromatic sulfur compounds of the PASH type are quite stable 3.




3. Environmental Chemistry

PASH are released into the environment by burning organic compounds, oil spills or other industrial activities. They have been determined in several environmental samples and are certified in some standard reference materials:

  • urban dust 4
  • marine sediments
  • coal tar 5



4. Toxicology

Like polyaromatic hydrocarbons (PAH) some species of PASH are carcinogenic and/or mutagenic as well. For instance, phenanthro[3,4-b]thiophene was proved to be highly mutagenic 6 and benzo[2,3]-phenanthro[4,5-bcd]thiophene was found to be even more mutagenic than benzo[a]pyrene 7. However, due to the lack of suitable standard reference materials this field of research is still largely unexplored.



 

Example of a Gas Chromatogram

Sulfur Selective Gas Chromatogram of coal tar SRM 1579



 

References

[1] W. B. Hughes, in: "Petroleum Geochemistry and Source Rock Potential of Carbonate Rocks" (J. G. Palaca, Ed., AAPG, Tulsa, 1984), pp. 181-196

[2] L. Schou, M. B. Myhr, Org. Geochem. 13, 61-66 (1988)

[3] A. Attar, F. Dupuis, Adv. Chem. Ser. 192, 239 (1981)

[4] S. A. Wise, B. A. Benner, S. N. Chesler, L. R. Hilpert, C. R. Vogt, W. E. May, Anal. Chem 58, 3067-3077 (1986)

[5] S. A. Wise, B. A. Benner, G. D. Byrd, S. N. Chesler, R. E. Rebbert, M. M. Schantz, Anal. Chem 60, 887-894 (1988)

[6] J. Jacob, Sulfur analogues of polycyclic aromatic hydrocarbons (Thiaarenes), Cambridge University Press, Cambridge, 1990

[7] Karcher, A. Nelsen, R. Depaus, J. van Eijk, P. Claude, J. Jacob in: "Chemical Analysis and Biological Fate: Polynuclear Aromatic Hydrocarbons", (M. Cooke, A. J. Dennis, Eds., Batelle Press, Columbus, 1981), pp. 317-327

 



PASH standards

 

Go to our PASH Catalog

 

Ordering Information



Prof. Dr. Jan T. Andersson
Institute of Analytical and Inorganic Chemistry
Corrensstr. 30
D-48149 Münster
Germany

Phone: ++49-251-83-33102
Fax: ++49-251-83-36013
E-mail: anderss (at) uni-muenster.de



Currently you can place orders by phone, mail or fax. An e-mail needs a signed confirmation by fax or letter.

Please order by catalog number, name of the compound, and the desired quantity.


Terms and Conditions of Sale

The standards offered in this catalogue are qualitative standards suitable only for laboratory use. Generally most items have a purity of 99% or better. Their quality has been checked by gas chromatography/mass spectrometry and other standard techniques. Material safety data (MSD) sheets are available on request.

The concentration of the standard solution is about 0.1 mg reference substance/mL. The standards are delivered in brown glass ampouls containing 1 mL standard solution. Storage conditions should be dark and cool.

If not ordered differently, the standards are dissolved in toluene. On special request different solvents such as methanol or isooctane can be offered. A surcharge may apply.

The solvents are flammable and the substances may be toxic. Keep the container tightly closed and keep it away from sources of ignition - no smoking! Avoid contact with the skin, inhalation and swallowing. The buyer is responsible for all handling after receiving the goods. Specifically, the seller is held free of any liability or responsibility arising from the use of these standards.

Please use the enclosed form for your order. The ordering number corresponds to the CAS-number. Please fill in the number of ampouls, the name of the compound and the price.

By sending the order form - by post or fax - the customer accepts our conditions of sale, delivery and payment. Deviations from these conditions need our written consent.


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The prices in the following lists are in Euro and do not include taxes. Orders delivered to German addresses will be assessed the legal sales tax (Umsatzsteuer). Postage will be added to all orders (see below).


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Go to our PASH Catalog

 

 

 


 


 

 

 

 

Impressum:

Name und Anschrift:

Prof. Dr. Jan T. Andersson

Universitaet Muenster

Institut für Anorganische  und Analytische Chemie

Corrensstr. 30

D-48149 Muenster

Germany

 

Telefon:

 ++49-251-83-33141

Fax:

++49-251-83-36013

E-Mail:

anderss@uni-muenster.de

 


 

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