Product Redesign of Chemical Standards Improves Atrazine and Simazine Stability - Verified by GC

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Courtesy of Sigma-Aldrich Co., LLC

Supelco routinely monitors its chemical standard products to determine shelf-life quality.  Atrazine and simazine, two triazine herbicides included in US EPA Methods 505 and 525, are unstable in methanol.  This application note describes the Supelco reformulation of four chemical standards containing these analytes, each originally prepared in methanol.  Accelerated stability studies demonstrated that the reformulated mixture components are stable in acetone for an equivalent of at least 16 months at 25 degrees Celsius.

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