Single-component standards are available as stock items. They are supplied in methanol, or in another solvent, where appropriate. Additional solvents include methylene chloride, acetone, benzene, hexane, acetonitrile, THF and water. Please inquire about the matrix for a particular item when ordering, if the matrix is important to your application, a substitution may be possible. Concentrations other than these, as well as custom matrices, are readily available, but a minimum order of five ampules may be required in some cases.