scholarly journals Electrocrystallization and solubility of mercury in alkaline solution

2018 ◽  
Vol 96 (4) ◽  
pp. 385-393
Author(s):  
Chris Staun ◽  
Neetu Bansal ◽  
James Vaughan
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Aqueous Sodium Hydroxide ◽  
Elemental Mercury ◽  
Chemical Thermodynamics ◽  
Mercuric Oxide ◽  
Hydroxide Solution ◽  
Aqueous Mercury ◽  
Electrochemical Polarisation

The chemical thermodynamics of mercury in aqueous sodium hydroxide solution has been investigated through electrochemical polarisation and solubility experiments. A review of thermodynamic data allowed determination of the Hg/HgO electrode potential. Cyclic voltammetry revealed a complex anodic reaction beginning with aqueous dissolution of elemental mercury and subsequent electrocrystallization of mercuric oxide. Cathodic sweeps showed dual reduction reactions, attributed to the presence of aqueous mercury and mercuric oxide. The solubility and hence activity of elemental mercury in sodium hydroxide solution was determined, otherwise known as the Sechenov salt effect. Sodium hydroxide salted mercury out of solution.

Colorimetric Determination of Oxyphenisatin and Oxyphenisatin Diacetate in Pharmaceutical Preparations

1964 ◽  
Vol 47 (4) ◽  
pp. 688-692
Author(s):  
Antoine Major
Keyword(s):  
Aqueous Solution ◽  
Organic Solvent ◽  
Silver Nitrate ◽  
Sodium Hydroxide ◽  
Column Chromatography ◽  
Sodium Hydroxide Solution ◽  
Pharmaceutical Preparations ◽  
Colorimetric Determination ◽  
Hydroxide Solution

Abstract A method is described which will quantitatively determine 0.1 mg oxyphenisatin or the diacetate in various pharmaceutical preparations. After removal of interferences by organic solvent extractions from aqueous solution and partition column chromatography, the reaction of oxyphenisatin (diacetate) with silver nitrate in alcoholic sodium hydroxide solution produces a violet solution, which follows Beer’s law (1—15 μg per ml). The method was satisfactorily applied to the assay of commercial tablets, liquids, and powders with recoveries, as per cent found of declared, in the range 95—101%.

Simple Colorimetric Method for Determination of Acetaminophen

1980 ◽  
Vol 63 (6) ◽  
pp. 1189-1190
Author(s):  
Ramesh T Sane ◽  
Sudhir S Kamat
Keyword(s):  
Elevated Temperature ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Colorimetric Method ◽  
Hydroxide Solution

Abstract A simple colorimetric method for the determination of acetaminophen is described. The method is based on the measurement of a crimson complex formed when acetaminophen is treated with 10% sodium hydroxide solution at elevated temperature. Compounds such as phenacetin, aspirin, caffeine, oxyphenbutazone, barbiturates, hydantoins, and dextropropoxyphen which are present in various formulations containing acetaminophen do not interfere. The method is sensitive to concentrations as low as 25 μg acetaminophen/mL.

Sign in / Sign up

Export Citation Format

Share Document