PASH Standards
PASH Catalog

PASH standard solutions


Go to our PASH Catalog

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



[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

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

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.


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).

Delivery and Shipping

We try to ship your order within one day after receiving your order but we cannot guarantee any time of delivery. On request your order will be sent as an express delivery at your expense.

Please add 4,50 Euro for postage and packaging for Germany and 9,50 Euro to foreign countries (surface post). Air mail postage may be higher. Express orders will be charged an additional 8,50 Euro.

The standards are carefully packaged. In any case the delivery will be made at the customers' risk.


The invoice has to be paid within 30 days of delivery. In the case of late payments we charge interest at the rate of 3 % above the current rediscount rate of the Deutsche Bundesbank.

Payment can be done directly to the bank account of the University of Münster as instructed on the invoice. Cheques drawn on reputable banks are also accepted. PayPal may be used for credit card payments. Please inquire regarding details.

Property Reservation

Delivered goods remains our property until payment has been received in full.


Complaints can be brought to notice within 10 days after receipt of the goods. They do not release the customer from payment obligations. In the case of complaints which are accepted by us, the goods are taken back and replaced or the price will be refunded. Further claims are excluded.

Redelivery of commodities without our written consent will not be accepted. 

Place of fulfilment and jurisdiction is Münster. German law is valid.

Privacy Statement

This site uses cookies. By continuing to browse the site, you are agreeing to our use of cookies.
Cookies are small identifiers stored by a server on the terminal device that you use to access our website or our services. They hold information that can be retrieved when our services are accessed and thus enable a more efficient and better use of our website.
We use permanent and so-called session cookies. Session cookies are deleted when you close your web browser. Permanent cookies remain on your terminal device until they are deleted, but up to a maximum of 60 days. The cookies are intended to improve our services and the use of certain features. Cookies are used to collect statistical values on our website, for example concerning the number of visitors. For this purpose our website also uses cookies from external suppliers, such as for example Google Analytics. But at no time do the cookies placed on your terminal device identify the user him/herself; they only identify the device used. The information stored using the cookies is not correlated with any of your personal data that might be saved by us.
You can configure your browser to inform you of the placement of cookies or to prevent the placement of cookies. In those circumstances certain functions of our website will not be usable.

Go to our PASH Catalog










Name und Anschrift:

Prof. Dr. Jan T. Andersson

Universitaet Muenster

Institut für Anorganische  und Analytische Chemie

Corrensstr. 30

D-48149 Muenster












Diese Seite verwendet Cookies, um den "Zähler" zu realisieren. Indem Sie sie nutzen, stimmen Sie dieser Verwendung zu.

Cookies sind kleine Kennungen, die ein Server auf dem Endgerät, mit dem Sie auf unsere Webseite oder unsere Dienste zugreifen, speichert. Sie enthalten Informationen, die bei einem Zugriff auf unsere Dienste abgerufen werden können und so eine effizientere und bessere Nutzung unserer Angebote ermöglichen.

Wir setzen permanente und sogenannte Session Cookies ein. Session Cookies werden bereits beim Schließen Ihres Webbrowsers gelöscht. Permanente Cookies verbleiben auf Ihrem Endgerät, bis sie gelöscht werden, längstens jedoch 60 Tage.
Die Cookies dienen einer Verbesserung unserer Dienste und der Nutzung bestimmter Features. Cookies werden hier verwendet, um statistische Werte zu unserem Webangebot, beispielsweise über die Anzahl der Besucher, zu erheben. Unsere Webseite nutzt dazu auch Cookies von Drittanbietern, wie zum Beispiel Google Analytics.
Zu keinem Zeitpunkt identifizieren die auf Ihrem Endgerät platzierten Cookies jedoch den Nutzer selbst, sondern ausschließlich das verwendete Gerät. Eine Zuordnung der durch die Cookies gespeicherten Informationen zu ggf. von Ihnen bei uns gespeicherten personenbezogenen Daten findet nicht statt.
Sie können Ihren Browser so einstellen, dass er Sie vor dem Setzen von Cookies informiert oder das Setzen von Cookies blockiert. Unter Umständen sind dann bestimmte Funktionen unseres Webangebots für Sie nicht nutzbar.