| 释义 |
protium Chem.|ˈprəʊtɪəm|
[mod.L., f. Gr. πρῶτ-ος first + -ium.]
The ‘normal’, most abundant isotope of hydrogen, having only a proton in the nucleus and forming at least 99 ·98 per cent (by volume) of naturally occurring hydrogen; symbol 1H (also H1). Cf. deuterium, tritium.
1933[see deuterium]. 1936Nature 12 Dec. 1021/1 Several attempts have been made to determine the ratio protium-deuterium (1H: 2H) in ordinary water, and the results mostly fall into two groups, either near 5500 or near 9000. 1957G. E. Hutchinson Treat. Limnol. I. iii. 211 Hydrogen has two stable isotopes, H1, sometimes called protium, and H2 or D, usually called deuterium. 1972Nature 31 Mar. 202/1 Of late, both Cornforth and Arigoni have developed techniques for the solution of this problem based in the chemical synthesis of CH3 - groups containing one atom each of the three hydrogen isotopes, protium, deuterium and tritium. 1975Physics Bull. May 211/1 In the case of the neutron diffraction experiments D2O was used instead of H2O as deuterium is a better coherent scatterer than protium. |