The Density at 25 °C of D₂O with Natural Oxygen Isotopic Composition

Abstract

In measuring the influence of oxygen isotopic composition and of hydrogen content on the density of heavy water an extrapolation was made to 100% D20 with natural oxygen isotopic composition, starting with the density of a highly enriched heavy water (99.95% D20, about natural oxygen isotopic composition).A value of 1104.481 kg/m 3 at 25 °C was obtained.

Effects of isotopic composition, temperature, pressure, and dissolved gases on the density of liquid water

“…In a pair of briefer papers, Brulmans et a1. [43,44] have reported a density of 1104.481±0.003 kg m-3 at 25.000 °C on the IPTS-48 (Brulmans, private communication) for D20 (100% D) with an oxygen composition of Y17 = 0.000375 (calculated) and r18 0.002039, again slightly different from the oxygen composition of SMOW. Densities were also given at eight other temperatures from 8 to 26°C; these two papers together have been treated as a single body of data.…”

“…Adjusting for light water to have the' density of SMOW, and adjusting to the oxygen isotope concentration standard adopted here, either by the method used by Ceccaldi et a1. or by the different algorithm given by Babeliowsky and Brulmans [43], gives a density at 25°C (lPTS-48) of figure). The deviations are perhaps no larger than the experimental errors (the error of the data defining the baseline is larger than that of Brulmans) • but.…”

“…Based on Goldblatt's values [59] adjusted to pure T20, the molar volume at atmospheric pressure is VT2o/cm3 mol-1 = 18.16150 -4.39208X10-3t (43) + 21.334153 X 10-9 t 4 -83.406 814X 10-12 t 5 , Two runs differed by 0.006 cm 3 mol-I, so the error of eq (43) is estimated as 0.01 cm 3 mol-I. 3.5 < t/oC < 72.…”