LGC Standards GmbH :
Louis-Pasteur-Strasse 30, 14943 Luckenwalde, Germany
Tel.: + 49 3371 68 16 80 Fax: + 49 3371 68 16 89 E-mail: de@lgcstandards.com
Merck/Millipore-Sigma-Aldrich Chemie GmbH:
Industriestrasse 25, CH-9471 Buchs, Switzerland
Tel.: + 41 81 755 2828 Fax: + 41 81 755 2815