| 释义 |
potass Chem. Now rare.|pəʊˈtæs, ˈpɒtæs|
[ad. F. potasse potash.]
An anglicized form, variously used according to the chemical notions of the time, for potash, potassa, and (in names of compounds) potassium.
1799Med. Jrnl. I. 243 To reduce the dropsical swellings..ten or fifteen grains of potass, two or three times a day, in some bitter draught, are directed. 1815J. Smith Panorama Sc. & Art II. 388 All the mineral acids dissolve tin, and it may be precipitated from its solutions by potass; but an excess of potass will re-dissolve the metal. Ibid. 414 Pure potass is extremely white, and so caustic, that if applied to the hand, the skin is instantly destroyed; it is therefore in this state called caustic alkali. The potash of commerce is always combined with carbonic acid,..this addition..reduces it to its usual state of what is called mild alkali, or by chemists carbonate of potass, or rather sub⁓carbonate of potass, as it is not saturated with the carbonic acid. 1860Piesse Lab. Chem. Wonders 26 A substance of similar composition to nitrate of potass (saltpetre).
b. Potash-water: see potash 4.
1883F. M. Crawford Dr. Claudius vi, I think I will have some curaçao and potass.
c. Comb.: potass-albite, albite containing potash instead of, or besides, soda.
1850Daubeny Atom. The. xii. (ed. 2) 416 In a few instances, as in potass-albite,..this base would seem to be partly soda and partly potass. |