Sigma-Aldrich® provides one of the broadest offerings of standards for pesticide analysis available. With a product portfolio of over 1300 pesticide and metabolite standards we are able to fulfill the needs of many laboratories. Recent product additions include proficiency testing (PT) samples, 15 certified reference materials (traceable to NIST standard reference materials), and matrix standards for monitoring sample preparation methods. Each analytical standard and PT sample has been carefully formulated to meet the needs of analysts in the environmental or food and beverage industries, in the form of neats, single- and multi-component solutionsTo complement the standards, we offer a wide range of solvents for Pesticide Residue Analysis (PRA solvents) which are glass-distilled and extensively tested by GC/ECD to ensure minimum halogenated residue levels (usually <5 ng/Liter lindane or heptachlor epoxide, unless otherwise indicated). All PRA solvents are available in amber glass bottles.