More than 40 years production and distribution of analytical standards, reference materials, environmental standards for residue analysis and environmental analysis. Pesticides, Pesticide Metabolites, PAH, PBB, PCB, Deuterated Compounds, 13C Labelled Compounds Worldwide distribution EQ Laboratories Inc.  English Dr. Ehrenstorfer GmbH  Deutsch  English  Portuguese  Mandarin  Russian About us • Product groups • Metabolites • MS Library • All products • Contact us A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | All