Merck, 900564, Calcium-44Ca carbonate
Size:, ≥97 atom % (⁴⁴Ca)
Catalog Number: 900564
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| UNSPSC Code | 12352302 |
|---|---|
| isotopic purity | ≥97 atom % (44Ca) |
| form | solid |
| mass shift | M+4 |
Answer:The specified enrichment is at least 97 atom % 44Ca.
Answer:No. Calcium-44 is a stable, nonradioactive isotope; the material is isotope-enriched calcium carbonate.
Answer:It provides isotopically enriched calcium for tracer experiments, isotope-ratio measurement and mass-spectrometric method development.
Sigma-Aldrich calcium-44 carbonate is a stable-isotope-enriched inorganic salt for analytical methods requiring a calcium tracer with a defined isotopic composition. The solid material contains calcium enriched to at least 97 atom % in the 44Ca isotope, with the formula 44CaCO3 and a molecular weight of approximately 103.96 g/mol. The mass difference relative to more abundant calcium isotopes supports isotope-ratio measurement, tracer studies and method development in suitable mass-spectrometric workflows. Sample digestion and calcium recovery methods must account for the carbonate matrix and any contamination from vessels or reagents. The product's isotope specification should not be confused with the chemical purity of ordinary calcium carbonate, and the applicable batch certificate remains important for quantitative work. Package quantity may be assigned through isotope supply arrangements rather than a fixed small-bottle format. This is a nonradioactive enriched reference material or tracer source, not a radioactive calcium isotope.
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