Determination of sulphide in blood with an ion-selective electrode by pre-concentration of trapped sulphide in sodium hydroxide solution

The Analyst ◽  
1988 ◽  
Vol 113 (5) ◽  
pp. 839-840 ◽  
Author(s):  
Henry Lindell ◽  
Paavo Jäppinen ◽  
Heikki Savolainen
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Hydroxide Solution

Determination of Iodine Values of Lipids by Bromide Ion Selective Electrode

1986 ◽  
Vol 69 (1) ◽  
pp. 67-69
Author(s):  
Ezzat M Abdel-Moety ◽  
Abdel-Kader S Ahmad ◽  
Mohie Sharaf El-Din
Keyword(s):  
Fatty Acids ◽  
Sodium Hydroxide ◽  
Filter Paper ◽  
Sodium Hydroxide Solution ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Degree Of Unsaturation ◽  
Bromide Ion ◽  
Iodine Values

Abstract A semimicro method for determination of iodine values of lipids is described. An accurately weighed smear of sample (10-20 mg) on a strip of ashless filter paper, 14 × 40 mm, is brominated with bromine vapors for about 5 min. Excess bromine adsorbed on the filter paper is allowed to sublime. Bromine absorbed by the sample is directly related to the degree of unsaturation. Paper with brominated sample is subjected to oxygen flask combustion in the presence of 2 mL 1M sodium hydroxide solution and 10 mL water as absorbing liquid. Bromide formed, which is equivalent to unsaturation, is determined by bromide ion selective electrode. Bromide ions can be also determined by gravimetry or by indirect argentometric titration. The results were statistically analyzed. The iodine values of some fatty acids and oils, determined by this technique, are in accord with those of some officially approved methods.

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.

The determination of nitrate and sulphate in 50% sodium hydroxide solution by ion-chromatography

Talanta ◽  
1988 ◽  
Vol 35 (3) ◽  
pp. 245-247 ◽  
Author(s):  
Jarl M. Petersen ◽  
Hanne G. Johnsen ◽  
Walter Lund
Keyword(s):  
Sodium Hydroxide ◽  
Ion Chromatography ◽  
Sodium Hydroxide Solution ◽  
Hydroxide Solution

scholarly journals Determination of Carbonate in Sodium Hydroxide Solution

1983 ◽  
Vol 24 (1) ◽  
pp. 38-41_1
Author(s):  
Sadawo KUSUWI ◽  
Shigeki MATSUO ◽  
Marehiko SHIMIZU
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Hydroxide Solution

scholarly journals Determination of Nicotine in Low-Nicotine Tobacco

1976 ◽  
Vol 8 (6) ◽  
Author(s):  
L. A. Lyerly ◽  
G. H. Greene
Keyword(s):  
Gas Chromatography ◽  
Sodium Hydroxide ◽  
Chromatographic Method ◽  
Sodium Hydroxide Solution ◽  
Hydroxide Solution ◽  
Gas Chromatographic Method

AbstractA gas chromatographic method for the determination of nicotine in low-nicotine tobacco is described. Tobacco samples are extracted with sodium hydroxide solution and chloroform. Nicotine in the chloroform is determined by gas chromatography. The method is applied to different tobacco types of varying nicotine levels and compared with other methods. The method is simple, rapid, and yields reproducible results.

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.

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