SMOW


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SMOW

[smau̇w or ¦es¦em¦ō′dəb·əl‚yü]
References in periodicals archive ?
These cements, which overgrow previous mineral phases, reportedly yield original [[delta].18][O.sub.water] (SMOW) values ranging from 0 to 5% (2% on average) [54].
Towards the top of the formation(from NN-9 to NN-10) the d 13C isotope ratios followed the same positive trend and decreased in positive values from 0.73 (VPDB) to 0.23 (VPDB) and d 13C isotope ratios also decreased from -5.36 (VPDB) or 25.39 (SMOW) to -4.47 (VPDB) or 26.31 (SMOW).
All laboratories reported the isotopic ratios relative to either Standard Mean Ocean Water (SMOW) or Vienna Standard Mean Ocean Water (VSMOW) in parts per thousand (permil notation).
A related research topic at NIST concerns the analysis of the actual isotopic purity of prepared [H.sub.2] samples relative to the deuterium to hydrogen (D/H) ratio of 156 [micro]mol/mol, derived from Standard Mean Ocean Water (SMOW), as specified by the ITS-90.
The standard is Standard Mean Ocean Water (SMOW) for hydrogen, atmospheric air for nitrogen, and PDB for carbon.
Yield [delta] [.sup.18]O Yield Sample Number (A) (%) (SMOW (B)) Sample Number (A) (%) Ogallala Alibates 1.
The [Delta]D values for the inclusion waters from the milky quartz range from -8.7 to -6.3 [+ or -] 2.0 % (SMOW).
Isotopic ratios are expressed in per mil ([delta]) and oxygen and hydrogen isotope analyses were reported to d notation relative to Vienna Standard Mean Oceanic Water (V-SMOW), where d = [(Rs/RVSMOW) - 1] x 1000, Rs represents either the [sup.18]O/[sup.16]O or the [sup.2]H/[sup.1]H ratio of the sample, and RSMOW is [sup.18]O/[sup.16]O or the [sup.2]H/[sup.1]H ratio of the SMOW. Typical precisions are [+ or -] 0.1 and [+ or -] 1% for oxygen-18 and deuterium, respectively.
1.1[per thousand]), averaging 1.08[per thousand] SMOW ([+ or -] 0.08[per thousand], 1[sigma]: maximum range = 0.2[per thousand]).