• WordNet 3.6
    • n ammonium the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
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Webster's Revised Unabridged Dictionary
    • n Ammonium (Chem) A compound radical, NH4, having the chemical relations of a strongly basic element like the alkali metals.
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Century Dictionary and Cyclopedia
    • n ammonium A name given to the hypothetical base (NH4) of ammonia, analogous to a metal, as potassium. . It has not been isolated. If mercury at the negative pole of a galvanic battery is placed in contact with a solution of ammonia or ammonium chlorid, and the circuit is completed, the mass swells to many times its former volume, and an amalgam is formed which, at the temperature of 70° or 80° F., is of the consistence of butter, but at the freezing-point is a firm and crystallized mass. This amalgam is supposed to be formed by the metallic base ammonium, and is the nearest approach to its isolation. On the cessation of the current the amalgam decomposes into mercury, ammonia, and hydrogen, the two latter escaping as gas in the proportions expressed by their atomic weights, namely, H and NH3
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Chambers's Twentieth Century Dictionary
    • n Ammonium the hypothetical base of ammonia
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Webster's Revised Unabridged Dictionary
See Ammonia
Chambers's Twentieth Century Dictionary
From sal-ammoniac, or smelling-salts, first obtained by heating camel's dung in Libya, near the temple of Jupiter Ammon.


In literature:

The second: a fifteen per cent solution of ammonium carbonate in water.
"The Home Medical Library, Volume V (of VI)" by Various
Titrate the excess silver with N/10 ammonium or potassium thiocyanate until a permanent light brown color appears.
"All About Coffee" by William H. Ukers
We will begin with the simplest example: the use of picro-carmine, a mixture of neutral ammonium carmine and ammonium picrate.
"Histology of the Blood" by Paul Ehrlich
You know how to work that metallic ammonium?
"Astounding Stories of Super-Science January 1931" by Various
Regulation of the sale and transfer of ammonium nitrate.
"Homeland Security Act of 2002" by Committee on Homeland Security, U.S. House of Representatives
Salts of ammonium were also known; while alum was used as a mordant in dyeing.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
Chloride of ammonium 5 grs.
"Notes and Queries, Number 235, April 29, 1854" by Various
C. the ammonium chloride is decomposed by the magnesia, with the formation of magnesium chloride and ammonia.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3" by Various
Again the professor applied the carbonate of ammonium.
"The Time Mirror" by Clark South
It unites directly with ammonia gas to form ammonium carbamate, NH2COONH4.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various
The end-products of protein metabolism are: ~urea~, ~ammonium salts~, ~purin bodies~, and ~creatinin~.
"Dietetics for Nurses" by Fairfax T. Proudfit
Ammonium hydroxide, 142, 152.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
In 1876, Kohlrausch compared the conductivity of the chlorides, bromides, and iodides of potassium, sodium, and ammonium respectively.
"The Mechanism of Life" by Stéphane Leduc
A small amount of fluorine is often present, and it is one of the few minerals in which ammonium has been detected.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
In the Solvay method of manufacture sodium chloride (common salt) and ammonium bicarbonate are mixed in solution.
"Soap-Making Manual" by E. G. Thomssen
Ammonium ferrous sulphate may also be used; it contains one-seventh of its weight of iron.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7" by Various
So far, therefore, ammonium chloride behaves like calcium carbonate.
"The Phase Rule and Its Applications" by Alexander Findlay
Benzoic acid itself, ammonium benzoate and sodium benzoate are all administered internally in doses of from five to thirty grains.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 6" by Various
Similar sodium, ammonium, lithium, magnesium, calcium, barium and zinc salts have been obtained.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7" by Various
Thus the chrome tannage is reversible in solutions of ammonium or potassium oxalate and of ammonium acetate.
"Animal Proteins" by Hugh Garner Bennett

In news:

Soil moisture is needed to temporarily hold the ammonia until it can become attached to clay or organic matter as ammonium .
The study found a temporary return of vision to blind mice by injecting an ammonium chemical.
A tanker truck hauling ammonium nitrate flipped onto its roof in Schuylkill County.
Calcium ammonium nitrate information products from ICIS.
What material would be good for an ammonium persulfate acid etch tank.
Keep ammonium (NH4) nitrogen levels in the root zone at less than 15 ppm by choosing high nitrate (NO3) based fertilizers like, 13-2-13, 15-5-15 or 15-0-15.
However, Nelson's fertilizers actually included large amounts of synthetic materials including aqueous ammonia, ammonium sulfate, and urea.
Learn more about AXXE, an herbicidal soap with ammonium nonanoate.
BioSafe Systems introduces AXXE broad Spectrum Herbicide AXXE is formulated as an herbicidal soap using ammonium nonanoate.
In 2010, the country outlawed calcium ammonium nitrate (CAN), the explosive ingredient used in around 80 percent of IEDs .
Barbero said as many as 80 percent of IEDs in Afghanistan are made from ammonium nitrate coming from fertilizer plants in Pakistan.
Growers can choose from calcium, chloride, potassium, sodium, ammonium and nitrate ions .
Ammonium nitrate, found in cold packs.
In the trunk, 300 pounds of ammonium nitrate and fuel oil, the same lethal ingredients that the Oklahoma City Bomber used to destroy the Federal Building in 1995.
If you've had a McDonald's hamburger over the last ten years, you've also consumed something that critics have dubbed "pink slime ," which consists of spare beef trimmings soaked in ammonium hydroxide to make them edible for humans.

In science:

Ammonium recombines with an electron to form NH3 + H, so the net effect is to convert gaseous N2 into NH3 .
Ice Lines, Planetesimal Composition and Solid Surface Density in the Solar Nebula
BAC stands for hexadecyl benzyl dimethyl ammonium chloride.
Variations on a theme: Changes to electrophoretic separations that can make a difference
Snell discovered 78As in 1937 at the Radiation Laboratory at the University of California in Berkeley which he announced in The Radioactive Isotopes of Bromine: Isomeric Forms of Bromine 80 . “The reaction 81Br(n,α )78As resulted from an activation of a large sample of ammonium bromide with (Be+D) neutrons.
Discovery of the Arsenic Isotopes
Sodium hydroxide solution: 1 N sodium hydroxide (Fluka). Ammonium hydroxide solution: 5 N ammonium hydroxide (Aldrich). Ammonium hydroxide is kept in the fridge.
Silver Staining of Proteins in 2DE Gels
Add successively 7.5 ml of 1N sodium hydroxide, 7.5 ml of 5N ammonium hydroxide and 12 ml of 1N silver nitrate. Upon addition of silver nitrate, a transient brown precipitate forms, which should redissolve within a few seconds (see Note 3).
Silver Staining of Proteins in 2DE Gels
Add successively 7.5 ml of 1N sodium hydroxide, 7.5 ml of 5N ammonium hydroxide and 12 ml of 1N silver nitrate. Upon addition of silver nitrate, a transient brown precipitate forms, which should redissolve within a few seconds (see Note 3).
Silver Staining of Proteins in 2DE Gels
Practically, the initiating system is composed of 1µl of TEMED, 10µl of 10% sodium thiosulfate solution and 10µl of 10% ammonium persulfate solution per ml of gel mix.
Silver Staining of Proteins in 2DE Gels
The solution given in this protocol has an ammonium/silver molar ratio of 3.1, which ensures maximal sensitivity, but less stability of the solution.
Silver Staining of Proteins in 2DE Gels
Jupiter’s ammonia-rich cloud cover into a layer containing ammonium hydrosulfide.3 Collective flow is another proposed indirect indication of thermalization.
Summary of Heavy Ion Theory