Chemical Reference Materials Setting the Standards for Ocean Science (2002) / Chapter Skim
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From page 77... ...
77 5 Production and Distribution of Chemical Reference Materials INTRODUCTION The preceding chapters detail the extensive need for reference materials in the ocean sciences. This chapter focuses on what is required to produce new reference materials as well as how to encourage the use of those that already exist.
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78 CHEMICAL REFERENCE MATERIALS REQUIREMENTS OF REFERENCE MATERIALS Reference materials must fulfill certain rigorous criteria before they are accepted and found useful by the analytical community. The following conditions are prerequisites for preparing reference materials that are mutually acceptable to organizations around the world: 1.
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PRODUCTION AND DISTRIBUTION OF CHEMICAL REFERENCE MATERIALS 79 laboration via the COMAR database is also included. For a discussion of the various steps of the certification process and the requirements for reference materials for a wide variety of specific substances see Stoeppler et al.
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80 CHEMICAL REFERENCE MATERIALS nized national facilities or, possibly, an ad hoc group of investigators [see below]
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PRODUCTION AND DISTRIBUTION OF CHEMICAL REFERENCE MATERIALS 81 useable lifetime. This process should also include periodic re-assessment of the certified concentration(s)
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82 CHEMICAL REFERENCE MATERIALS PREPARATION OF RECOMMENDED NEW REFERENCE MATERIALS AND CERTIFIED REFERENCE MATERIALS FOR OCEAN SCIENCE The rationale for choosing particular reference materials (and, in some cases, for recommending certification of reference materials) was discussed in Chapters 3 and 4.
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PRODUCTION AND DISTRIBUTION OF CHEMICAL REFERENCE MATERIALS 83 contents. Such samples could be obtained from the Sargasso Sea during the summer after spring phytoplankton blooms have depleted most of the surface nutrients.
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84 CHEMICAL REFERENCE MATERIALS Approaches to the Preparation of Radionuclide Reference Material Solutions Radionuclide reference materials can be prepared from natural ores of uranium and thorium. The uranium ore selected should have concordant ages, indicating that the system has been closed long enough to establish radioactive equilibrium through the long-lived nuclides.
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PRODUCTION AND DISTRIBUTION OF CHEMICAL REFERENCE MATERIALS 85 organic carbon components, and δ15N for the total nitrogen component. These matrix types (opal, carbonate, and aluminosilicate)
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86 CHEMICAL REFERENCE MATERIALS larger number of samples. However, stability concerns may not always make larger batches a feasible option, particularly if the number of portions produced would not be distributed in an appropriate time frame.
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PRODUCTION AND DISTRIBUTION OF CHEMICAL REFERENCE MATERIALS 87 This collaborative approach to the development of consensus materials could thus result in the eventual certification of those materials, if required. Arrangements could possibly be developed with existing certified reference material or reference material producers to disseminate information and to distribute materials to the oceanographic research community.
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