ammonium

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am·mo·ni·um

 (ə-mō′nē-əm)
n.
The univalent chemical ion NH4+, derived from ammonia, whose compounds chemically resemble the alkali metals.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ammonium

(əˈməʊnɪəm; -njəm)
n
(Chemistry) (modifier) of, consisting of, or containing the monovalent group NH4– or the ion NH4+: ammonium compounds.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

am•mo•ni•um

(əˈmoʊ ni əm)

n.
the univalent ion, NH4 + , or group, NH4, which plays the part of a metal in the salt formed when ammonia reacts with an acid.
[1808;< New Latin; see ammonia, -ium2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

am·mo·ni·um

(ə-mō′nē-əm)
A positively charged ion, NH4, derived from ammonia and found in a wide variety of organic and inorganic compounds.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ammonium - the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
ammonia - a pungent gas compounded of nitrogen and hydrogen (NH3)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
amonij
암모늄

ammonium

[əˈməʊnɪəm]
A. Namonio m
B. CPD ammonium hydroxide Nhidróxido m amónico
ammonium sulphate Nsulfato m amónico
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

ammonium

[əˈməʊnɪəm] nammonio
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

ammonium

n amonio; — carbonate carbonato de amonio, carbonato amónico (esp. Esp)
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
Chromatographic separation was achieved using a Phenomenex Prodigy ODS3 column (250 x 4.6 mm; 5 um; Macclesfield, UK) using a binary solvent system comprising 0.02 M ammonium acetate solution adjusted to pH 6.00 (A) and acetonitrile (B).
For both analyse, more appropriate resolution and symmetrical peaks were obtained in the aggregate of ammonium acetate buffer solution (pH 7.6) and acetonitrile 50:50% (v/v) at a flow rate of 0.5 mL/min over 125 mm x 4.6 mm, 5 um C18.
Ammonium acetate, aqueous ammonium hydroxide solution which were used for pH adjust of solutions were obtained from Fisher Scientific (Waltham, MA, USA).
Five commercially available lures were used in the survey: (1) torula yeast: 3 pellets per 300 mL water (Chemtica Internacional S.A., Heredia, Costa Rica); (2) methyl eugenol: a solid sustained-release preparation (Chemtica Internacional S.A., Heredia, Costa Rica); (3) cuelure: a solid sustained-release preparation (Chemtica Internacional S.A., Heredia, Costa Rica); (4) 2-component fruit fly bait (2-component): a solid sustained-release preparation with ammonium acetate + putrescine (Scentry Biologicals, Inc., Billings, Montana, USA); and (5) 3-component fruit fly bait (3-component): a solid sustained-release preparation with ammonium acetate + putrescine + tri-methylamine (Scentry Biologicals, Inc., Billings, Montana, USA).
Owing to the potency and wide applicability of this moiety, a diversity-oriented convergent synthesis through multi-component cyclocondensation of dicarbonyl substrates with numerous aryl aldehydes and ammonium acetate was carried out by employing two active catalysts individually.
0.1 M cold ammonium acetate buffer solution (ammonium acetate 0.77 g, 80% acetone 100 mL) was added to the precipitate collected, which was washed with 80% acetone two times.
Addition of anionic ion-pairing reagents, for example, sodium dodecyl sulphate or salts (e.g., ammonium acetate, ammonium formate, and sodium phosphate) is also used to improve the chromatographic separation [5, 13, 17, 22].
Ammonium acetate (GPR Rectapur) was from VWR Chemicals, and sodium hydroxide was from Merck Company (Darmstadt, Germany).
General factorial design of experiment was used to compare all possible conditions for the following factors: Ionization Mode (APCI, ESI, DUIS), organic phase (methanol, acetonitrile), aqueous phase (5 mM ammonium acetate, 5 mM oxalic acid, 0.1% acetic acid, 0.1% formic acid).
To ensure better dissolution of the studied pharmaceuticals, fluoroquinolones were dissolved in 2 ml of 0.1 mM ammonium acetate buffer solution with pH 2.8 and sulfonamides were dissolved in 2 ml of 0.3 M NaOH.
The separation was achieved on an Agilent TC-[C.sub.18] column (250 mm x 4.6 mm, 5 [micro]m) at 30[degrees]C using methanol (A)-0.1% formic acid and 5 mM ammonium acetate water (B) (5 : 95, v/v) as initial proportion of the isocratic elution.