Use of urea for eliminating chlorine formed in the determination of chromium by ammonium peroxodisulfate oxidation and potassium dichromate back titration

1995 ◽  
Vol 352 (6) ◽  
pp. 603-603
Author(s):  
Y�etsu Danzaki
Keyword(s):  
Potassium Dichromate ◽  
Back Titration ◽  
Ammonium Peroxodisulfate

Titrimetric Determination of Iodine-Bromine Numbers of Some Edible Oils Using Three N-Chloroimides

1987 ◽  
Vol 70 (4) ◽  
pp. 762-763
Author(s):  
Narayanan Jayasree ◽  
Parameswaran Indrasenan
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Solid State ◽  
Palm Olein ◽  
Edible Oils ◽  
Aqueous Acetic Acid ◽  
Acetic Acid Medium ◽  
Back Titration ◽  
Titrimetric Determination

Abstract Three simple titrimetric methods have been developed to determine iodine-bromine numbers of some edible oils, such as coconut, gingelly, groundnut, mustard, olive, palm olein, and sunflower, using 3 N-chloroimides. The 3 N-chloroimides are N-chlorophthalimide, N-chlorosuccinimide, and N-chlorosaccharin, all of which have recently been developed as potential oxidimetric titrants for use in aqueous acetic acid medium. The proposed excess back-titration methods have advantages over existing methods in terms of ease of extraction into aqueous acetic acid layer, shorter reaction time of NCSA method, and stability of N-chloroimides in solid state.

scholarly journals Sensitive and rapid titrimetric and spectrophotometric methods for the determination of stavudine in pharmaceuticals using bromate-bromide and three dyes

2008 ◽  
Vol 80 (2) ◽  
pp. 253-262 ◽  
Author(s):  
Kanakapura Basavaiah ◽  
Veeraiah Ramakrishna ◽  
Chikkaswamy Somashekar ◽  
Urdigere R. Anil Kumar
Keyword(s):  
Dosage Forms ◽  
Linear Increase ◽  
Thymol Blue ◽  
Fixed Amount ◽  
Rapid Methods ◽  
Spectrophotometric Methods ◽  
Back Titration ◽  
Bulk Drug ◽  
Hcl Medium

Four sensitive and rapid methods for the determination of stavudine (STV) in bulk drug and in dosage forms were developed and optimized. In titrimetry, aqueous solution of STV was treated with a known excess of bromate-bromide in HCl medium followed by estimation of unreacted bromine by iodometric back titration. Spectrophotometric methods involve the addition of a measured excess of bromate-bromide in HCl medium and subsequent estimation of the residual bromine by reacting with a fixed amount of methyl orange, indigocarmine or thymol blue followed by measurement of absorbance at 520 nm (method A), 610 nm (method B) or 550 nm (method C). In all the methods, the amount of bromate reacted corresponds to the amount of STV. Calculations in titrimetry were based on a 1:0.666 (STV:KBrO3) stoichiometry and the method was found to be applicable over 3.5-10 mg range. A linear increase in absorbance with concentration of STV was observed in the spectrophotometric methods, and the Beer's law was obeyed over the concentration ranges 0.125-1.75, 1-10 and 1-9.0 µg mL-1 STV for method A, method B and method C, respectively. The methods when applied to the determination of STV in tablets and capsules were found to give satisfactory results.

Sign in / Sign up

Export Citation Format

Share Document