precolumnn.adj.

Brit.

/ˈpriːˌkɒləm/, U.S.

/ˈpriˌkɑləm/

Origin: Formed within English, by derivation. Etymons: pre- prefix, column n.

Etymology: < pre- prefix + column n.

Chemistry.

A. n.

A chromatographic column used to filter or modify a substance before it is passed through a second column.

ΚΠ

1958 Proc. 2nd U.N. Internat. Conf. Peaceful Uses Atomic Energy X. 91/1 A demineralizer system consisting of cation and anion ‘precolumns’ preceding a mixed bed column was developed... The precolumns remove most of the radioactivity from the water.

1992 Oil & Gas Jrnl. (Nexis) 30 Nov. 50 The precolumn retains oxygenates but allows paraffin and olefin hydrocarbons to elute into a silica plot capillary column.

2005 Drug Week (Nexis) 11 Nov. 381 According to a study from Taiwan, columns packed with microsized titanium dioxide particles have been used effectively as precolumns for enriching phosphopeptides from complex mixtures.

B. adj.

Carried out prior to analysis or separation in a chromatography column.

ΚΠ

1964 Science 24 Jan. 389/1 (advt.) This amazingly precise instrument will test for..air pollutants without precolumn concentration.

2005 Chest (Nexis) 127 1184 Basic amino acids were extracted by using a cation-exchange cartridge and subjected to precolumn derivatization with o-phthaldialdehyde.

This is a new entry (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	precolumn
释义	precolumnn.adj. Brit. /ˈpriːˌkɒləm/, U.S. /ˈpriˌkɑləm/ Origin: Formed within English, by derivation. Etymons: pre- prefix, column n. Etymology: < pre- prefix + column n. Chemistry. A. n. A chromatographic column used to filter or modify a substance before it is passed through a second column. ΚΠ 1958 Proc. 2nd U.N. Internat. Conf. Peaceful Uses Atomic Energy X. 91/1 A demineralizer system consisting of cation and anion ‘precolumns’ preceding a mixed bed column was developed... The precolumns remove most of the radioactivity from the water. 1992 Oil & Gas Jrnl. (Nexis) 30 Nov. 50 The precolumn retains oxygenates but allows paraffin and olefin hydrocarbons to elute into a silica plot capillary column. 2005 Drug Week (Nexis) 11 Nov. 381 According to a study from Taiwan, columns packed with microsized titanium dioxide particles have been used effectively as precolumns for enriching phosphopeptides from complex mixtures. B. adj. Carried out prior to analysis or separation in a chromatography column. ΚΠ 1964 Science 24 Jan. 389/1 (advt.) This amazingly precise instrument will test for..air pollutants without precolumn concentration. 2005 Chest (Nexis) 127 1184 Basic amino acids were extracted by using a cation-exchange cartridge and subjected to precolumn derivatization with o-phthaldialdehyde. This is a new entry (OED Third Edition, March 2007; most recently modified version published online March 2022). < n.adj.1958
随便看	kdrama kdt ke ke- kea keach keach-cup keachcup keaching-ladle keaching-net keachingladle keachingnet keak keas keat keating keatite keatonesque keatsian keatsiana keawe keb keb at keb-ewe keb-house