The multi-element Ion Chromatography standards are packaged in both 125ml or 500ml bottles for convenience and are available in both 100ppm or 1000ppm concentrations. The multis have a 12 month shelf-life, are traceable to NIST standards, have an accuracy of +/- 1%, and a comprehensive Certificate of Analysis is provided. The standards are composed of seven anions that are commonly used to characterize and assess many types of waters (ground, surface, and wastewaters as well as drinking).