The extractants used include Acetic acid, Sodium acetate buffer (Morgan solution), Ammonium acetate buffer (Modified Morgan's solution), Sodium bicarbonate (Olsen extractant), Acidified ammonium fluoride (Bray - I reagent) and Anion Exchange Resin (AER).
The extractants used in the study were 0.5 M Acetic acid (Korndorfer et al., 1995), Sodium acetate buffer (Morgan, 1941), Ammonium acetate buffer (McIntosh, 1969), Sodium bicarbonate (Olsen et al., 1954), Acidified ammonium fluoride (Bray and Kurtz, 1945) and Anion Exchange Resin (Sibbesen, 1978).
Extensively used food-preservatives are salicylic, benzoic, and boric acids, and their sodium salts, formaldehyde, ammonium fluoride
, and sulphurous acid.
The mobile phase consisted of a gradient formed using 1 mM ammonium fluoride and methanol.
Liquid chromatography (LC)-MS CHROMASOLV[R] grade [greater than or equal to] 99.9% methanol and acetonitrile (ACN) and [greater than or equal to] 99.99% ammonium fluoride were purchased from Sigma-Aldrich, St Louis, MO.
When the PSi chip was immersed in the mixture of 40 % ammonium fluoride
and 0.02 M nickel sulfate solutions with volume ratio of 1:1 at 60C for 15 min, a large number of Ni NPs were generated on PSi surface, which exhibited high catalytic activities on reducing nitro groups of aromatics in the presence of sodium borohydride at ambient temperature.
The electrolyte is composed of 100 mL of 1M of sodium sulfate ([Na.sub.2]S[O.sub.4], Merck, USA) solution with ammonium fluoride
(N[H.sub.4]F, Merck, USA) at 40 V with sweep rate of 1V/s.
He said the injured were in a stable condition in hospital, but added they inhaled carbon fumes not ammonium fluoride
. //Petra//SS 7/1/2012 - 03:50:27 PM
The Silicon (III) wafers were cleaned with Piranha solution, etched with ammonium fluoride
, chlorinated in a vacuum chamber and the eight arm PEG attached.
Treating the wafer with ammonium fluoride
can smooth out that roughness, leaving the surface perfectly flat, says Melissa A.
of 0, 0.1, 0.2, and 0.3 mM were added separately to the solutions.