More than 40 years production and distribution of analytical standards, reference materials, environmental standards for residue analysis and environmental analysis. Worldwide distribution Pesticides and pesticide metabolites PAH, PBB, PCB, Phenol, Volatiles, Semi-Volatiles and other potential pollutants like azodyes, toxaphen single congeners, optical active enantiomers, explosives, polycyclic musk compounds, epa method mixes, stable isotope labelled chemicals like deuterated compounds, 13C lab...