ammonium acetate


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ammonium acetate

[ə′mōn·yəm ′as·ə‚tāt]
(organic chemistry)
CH3COONH4 A normal salt formed by the neutralization of acetic acid with ammonium hydroxide; a white, crystalline, deliquescent material used in solution for the standardization of electrodes for hydrogen ions.
CH3COONH4·CH3COOH An acid salt resulting from the distillation of the neutral salt or from its solution in hot acetic acid; crystallizes in deliquescent needles.
A mixture of the normal and acetic salts; used as a mordant in the dyeing of wool.
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References in periodicals archive ?
The LC mobile phase gradient employed 10 mM ammonium acetate (A) and acetonitrile (B).
Combination of acetonitrile and ammonium acetate buffer (pH 7.6) was used to set the base line.
al.' batch procedure [28] by the addition of 50 mg portions of the dry resin to 10 ml solution contains 100mg/l of each metal prepared in ammonium acetate solution (1.0 M, pH 6).
Based on the obtained results, acetonitrile at concentration of 20% and water at pH 3-4 with addition of 10-20 mM ammonium acetate or ammonium formate were considered as optimal for isoquinoline alkaloid separation on an XB-C18 core-shell column.
The ammonium acetate concentration higher than 0.1 M was not suitable for water-soluble food dyes because of the "salting-out" effect [26].
Although the MS signal of analytes was higher using an eluent with a lower pH (ammonium acetate, formic acid with pH 2.8), the separation of the compound was not followed.
Because the analytes were weak alkali, the smearing could be alleviated with the poor chromatographic peak shape after using 5 mM ammonium acetate buffer.
The chemicals used, namely benzil, aldehydes, and ammonium acetate, were of analytical reagent grade.
Perhaps the most important disadvantage of this reagent is supplied by the resorption of metals in the residual fraction, which requires an additional extraction with ammonium acetate at pH = 2 (SUTHERLAND et al., 2000; FERREIRA & SANTANA, 2012).
Sodium contents were determined both in 1:2 water extract and ammonium acetate extract and are given in Table 2.
The column was equilibrated and eluted with 200 mM ammonium acetate buffer (pH 5.2) at a flow rate of 0.3 mL/min.
Step Solvent Rhamnolipid extraction 1 Subboiling purified water (20 mL) 2 1M ammonium chloride (8 mL) 3 1M ammonium acetate (20 mL) at pH 4 4 Mixture of 10.9 g/mL oxalic acid and 16.2 g/L ammonium oxalate (20 mL) 5 Six M hydrochloric acid (30 mL) 6 (a) 8.8 M hydrogen peroxide (5 mL, pH 2) (b) 8.8 M hydrogen peroxide (5 mL, pH2) (c) 1 M ammonium acetate (25 mL, pH 4) 7 (a) hydrofluoric acid/aqua regia (5 mL) (b) perchloric acid (5 mL) Step Duration/temperature Seventy-two hr at room temp 1 1 hr at 95[degrees]C.