Abstract
High-resolution fast atom bombardment mass spectrometry was used to measure the isotopic abundances of calcium in plasma and urine. Since the method is very sensitive (>5 x 10/sup 10/ ions/..mu..g of calcium), only 2 to 5 ..mu..L of sample is required. Repetitive measurements of the /sup 42/Ca//sup 40/Ca ratio in plasma and urine require about 3 min and typically have a relative standard deviation of 0.2-0.5%. No sample preparation is necessary and measurements are made by using instrumentation that is often available in larger research laboratories.
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