本文
No.5（2002）3.Precise and accurate analyses of major components in precious metal alloy using the isotope dilution method
Michihisa UEMOTO
The isotope dilution mass spectrometric method is generally accepted as a primary method of measurement (a primary ratio measurement) with high accuracy. This method has been developed with the double focusing sector field inductively coupled plasma mass spectrometer, which is capable of making high precise isotope ratio measurements. Major components of silver and copper in a precious metal alloy, one of the precious brazing filler metals for vacuum services, have been determined. In spite of the demerit of excess dilution procedures, the analytical results (Ag;72.28±0.07 %, Cu;27.77±0.01 %) coincide well with those obtained from the primary gravimetric methods on precision and accuracy, and satisfy requests from material industries that they must have four significant figures.
Keywords
Isotope dilution, ICP-MS, Double focusing sector field, Precious metal alloy, High precision
