Journal
ANALYTICAL CHEMISTRY
Volume 89, Issue 17, Pages 9031-9038Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.7b01719
Keywords
-
Categories
Funding
- National Key Technology Research and Development Program [2013BAK10B04]
- National Key Research and Development Plan [2017YFF0205801]
Ask authors/readers for more resources
A fully calibrated strategy has been investigated for the first time for the accurate determination of absolute isotopic composition and atomic weight of molybdenum using multiple-collector inductively coupled plasma mass spectrometry. The correction for instrumental mass bias was performed using synthetic isotope mixtures, which were gravimetrically high prepared with all of the seven-purity and isotopically enriched molybdenum isotope materials together. Six natural molybdenum materials, including molybdenum standard solution NIST SRM 3134, were accurately measured and yielded the absolute isotopic composition (in atom %, k = 1) of Mo-92-14.690(18), Mo-94-9.173(6), Mo-98-15.865(5), Mo-96-16.666(3), Mo-97-9.588(4), Mo-98-24.307(16), and Mo-100-9.711(13). These isotopic data enable an atomic weight A(r)(Mo) of 95.9466(34) (k = 2) to be calculated, which is slightly lower than the current standard atomic weight 95.95(1) and with a much improved uncertainty. The associated uncertainties were evaluated according to the Guide to Expression of Uncertainty in Measurement of ISO/BIPM and Monte Carlo simulation to ensure that all sources of uncertainty were fully accounted for. A particular characteristic of the proposed new approach is that mass bias correction factor K for each isotope ratio of molybdenum can be achieved via fully experimental determination without using the traditional semiempirical correction mathematical models. In addition, the relationship between mass of isotope and bias per mass unit beta was investigated based on the thorough measurement data.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available