Chemical Stability and Compatibility - Stability of multi-element standards
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Comprehensive information regarding stability is available on our website, specifically in the Interactive Periodic Table: http://inorganicventures.com/periodic-table and Part 7 of the Trace Analysis Guide: http://inorganicventures.com/stability-elements-ppb-concentration-levels With regard to accuracy over an extended period of time, factors to consider include chemical stability, transpiration losses, and the ‘human factor’. We discuss these concerns at: http://www.inorganicventures.com/shelf-life-vs-expiration-date-chemical-standard In general, chemical stability is not an issue, though element and matrix compatibility need to be accounted for. Furthermore, as concentrations decrease, an increasing number of elements can be combined into chemically stable mixtures. Considering the time frame you are concerned about (several years) systematic errors in concentration due to transpiration are likely to be the greatest concern. |