Absolute isotopic abundance ratios and the atomic weight of a reference sample of potassium

Abstract

So lid s amp le .th e rma l ioni za tion.ma ss s pec trom e try ha s bee n used to obtai n a bs o lut e va lu es ror t he iso top ic ab und a nce ra t ios of a refe re nce sa m pie or potass iu m. S La nd a rd s of known is ot o pi e c o mp os i• Lio n , pre pare d b y gr av im e tri c all y mixin g nea rl y iSo Lopi ca ll y and c he mi c a ll y pure se parat e d isotopes of "" K a nd " K. we re use d for c a libra t ion .Th e a b solute iso top ic a bund a nce ra t ios a re "" K/ 41 " = 13.8566± 0.0063 a nd ""K /41 K = 0.001 7343 ± 0.0000061 whi c h yie ld a to m pe rce nt co mpos iti on s of "!o K = 93.258 1 ± 0.0029 . .w " = 0.01 J 67 ± 0.00004.a nd ."K = 6.7302 ± 0.0029.Th e ca lc ul a te d a to mi c we i!!ht for pot ass iu m is 39.098304 ± 0.000058.Th e indi ca te d un cert a inti es a re o ve ra ll limit s of e rror whi c h arc th e s um o f th e un cer ta int y co mpon e nt s for ra ti o d e te rmin a ti on s a nd th e cu mpon e nt s c ov e r in i! th e effec ts o f known s o urces of po ss ibl e s ys te ma ti c e rror.Key wo rds: A bso lut e ra tius : a to mi c we ii! ht: iso top ic ab u ndance: po ta ss ium : re fe r e nce s ta nd a rd ., Fi l! ures in hrac kel s indi (' al e t he lit era ture refe rence s at th e end of Illi s paper.

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