ABSOLUTE ISOTOPIC ABUNDANCE RATIO AND THE ATOMIC WEIGHT OF SILVER
An absolute value for the isotopic abundance ratio of natural silver was obtained by the use of isotopic standards prepared from nearly pure separated silver isotopes. Mass spectrometric data resulted in a value for the ratio (Ag/ sup 107//Ag/sup 109/ = l.0754/sub 7/ plus or minus 0.0013). Within the sta ted limits, no variation in natural abundance was found among six samples of native silver and commercial silver nitrate. A seventh native silver sample, obtained from Cobalt, Ontario, showed a statistically significant deviation. The calculated physical and chemical atomic weights of silver are respectively. On the recently proposed unified physcial and chemical atomic weight scale (C/sup 12/ = 12), the atomic weight is 107.8685 plus or minus 0.0013. The indicated uncertainties are overall limits of error based on 95% coafidence limits for the mean and on allowances for effects of known sources of possible systematic error. (auth)
- Research Organization:
- National Bureau of Standards, Washington, D.C.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-000215
- OSTI ID:
- 4133626
- Journal Information:
- Journal of the American Chemical Society (U.S.), Journal Name: Journal of the American Chemical Society (U.S.) Vol. Vol: 82; ISSN JACSA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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