GUIDELINES FOR THE USE AND HANDLING OF WELLINGTON PRODUCTS DISPOSAL


All waste materials generated during the use of these solutions should be treated as hazardous in accordance with national and regional regulations. A licensed disposal company should be employed. Some options for the destruction of these materials include high temperature incineration, photolysis, or chemical treatment using reagents such as sodium naphthalene or KPEG reagent. Literature references for some of these methods can be provided upon request.


ACCURACY


Each of our stock solutions is prepared from crystalline material that has been well characterized as to its structure and purity.


The crystalline material is weighed using microbalances that are externally calibrated using NIST- traceable weights. Solutions are prepared by completely dissolving the crystalline material in ultrapure, distilled-in-glass solvents. The volumetric flasks used for this purpose, and the pipets used for subsequent preparation of dilutions and mixtures, are all of class A tolerance and NIST-traceable.


The maximum percent relative combined uncertainty for solution preparation is calculated to be ± 5 %.


INTERLABORATORY CERTIFICATION Wellington continues to submit its standards for independent interlaboratory testing and certification. Since 1991, our standards have been tested in 20 international round-robins.


To date, solutions of the compounds listed below have been repeatedly tested and the approximate total number of analyses are given.


• 2,3,7,8 - substituted PCDDs and PCDFs ...................................1000 HRMS analyses • Dioxin-like (WHO) PCB congeners ............................................1000 HRMS analyses • PBDEs .........................................................................................100 HRMS analyses


The overall averages of the data received for all of the compounds were found to be well within ± 10 % of the design values.


EXPIRY DATE/SHELF LIFE


In order to accurately determine the shelf life of products such as ours, testing must reveal significant degradation or loss in concentration of the particular analyte. In comparing freshly prepared solutions to older solutions by GC/MS, we have not detected any significant changes. Many of these older solutions were prepared and ampouled more than 15 years ago. Thus our stability studies, as they should, remain ongoing.


For our products where the expiry date on the C of A states, “stability studies ongoing”, we consider that our reference standard solutions retain their accuracy for a period of 5 years from delivery in the unopened ampoule.


NOTE: The predominant degradation pathway for our compounds is likely photolysis and thus protection from light is critical.


169 www.well-labs.com


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