Standard Reference Materials

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Excerpt from Standard Reference Materials: Methods and Procedures Used at the National Bureau of Standards to Prepare, Analyze and Certify Srm 2694, Simulated Rainwater, and Recommendations for UseThe pressing need of the scientific community for a common reference material for rainwater and the desire by us to field test such a material led to the production and distribution of a Research Material, RM 8409, Simulated Rainwater. Rms are distinguished from srms according to the definitions of the Office of Standard Reference Materials, National Bureau of Standards, In brief, rms are high quality materials whose composition have been established by a single technique for each component. The composition of srms is certified after much more extensive testing involving at least two independent techniques for each component, or analysis by a definitive met hod. Often an RM uncovers unforeseen problems, as was the Situation in this case. This problem involved the long-term stability of the ammonium ion.The extent of the instability and its ramifications will be addressed below.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.