scholarly journals A new method for the macro- and microdetermination of tri- and tetrathionate

1977 ◽  
Vol 55 (22) ◽  
pp. 3887-3893
Author(s):  
K. A. Idriss ◽  
I. M. Issa ◽  
M. R. Mahmoud
Keyword(s):  
Acid Medium ◽  
Sulphuric Acid ◽  
Oxidation Product ◽  
New Method ◽  
Optimum Conditions ◽  
Precise Method ◽  
End Point Detection ◽  
Point Detection ◽  
Sulphuric Acid Medium

A rapid and precise method is described for the determination of tri- and tetrathionate. It is based on oxidation of S3O62− or S4O62− with KMnO4 in sulphuric acid medium in the presence of fluoride, required for preventing the formation of insoluble oxides of manganese. The optimum conditions for both the visual and potentiometric end-point detection are 0.1–0.16 M H2SO4 and 0.24–0.38 M NaF. Trithionate is oxidized to sulphate as an end product, whereas the oxidation product of tetrathionate comprises dithionate and sulphate according to[Formula: see text]Examination of the potentiometric titrations and the spectrophotometric scans of samples being titrated showed the presence of intermediate equilibria in solution. The species produced are identified and a theory is given for the net reactions. The method is thoroughly dependable for the determination of amounts of S3O62− or S4O62− corresponding to 0.1–10 mg of sulphur.

scholarly journals Indirect spectrophotometric determination of gentamicin and vancomycin antibiotics based on their oxidation by potassium permanganate

2006 ◽  
Vol 4 (4) ◽  
pp. 708-722 ◽  
Author(s):  
Akram El-Didamony ◽  
Alaa Amin ◽  
Ahmed Ghoneim ◽  
Ayman Telebany
Keyword(s):  
Acid Medium ◽  
Potassium Permanganate ◽  
Pharmaceutical Formulations ◽  
Molar Absorptivity ◽  
Reaction Conditions ◽  
Subsequent Determination ◽  
Optimum Reaction ◽  
Acid Orange Ii ◽  
Sulphuric Acid Medium

AbstractFour simple, accurate, sensitive and economical procedures (A–D) for the estimation of gentamicin sulphate and vancomycin hydrochloride, both in pure form and in pharmaceutical formulations have been developed. The methods are based on the oxidation of the studied drugs by a known excess of potassium permanganate in sulphuric acid medium and subsequent determination of unreacted oxidant by reacting it with amaranth dye (method A), acid orange II (method B), indigocarmine (method C) and methylene blue (method D), in the same acid medium at a suitable λmax=521, 485, 610 and 664 nm, respectively. The reacted oxidant corresponds to the drug content. Regression analysis of Beer-Lambert plots showed good correlations in the concentration ranges 4–8, 3–8, 4–9 and 5–9 µg ml−1 with gentamicin and 4–8, 1.5–4, 1.5–4 and 3.5–5.5 µg ml−1 with vancomycin for methods A, B, C, and D, respectively. The molar absorptivity, sandell sensitivity, detection and quantification limits were calculated. The stoichiometric ratios for the cited drugs were studied. The optimum reaction conditions and other analytical parameters were evaluated. The influence of the substance commonly employed as excipients with these drugs were studied. The proposed methods were applied to the determination of these drugs in pharmaceutical formulations. The results have demonstrated that the methods are equally accurate and reproducible as the official methods.

The determination of phosphorus in organic compounds with potentiometric end-point detection

1970 ◽  
Vol 58 (1) ◽  
pp. 52-57 ◽  
Author(s):  
J. Slanina ◽  
P. C. M. Frintrop ◽  
J. F. Mansveld ◽  
B. Griepink
Keyword(s):  
Organic Compounds ◽  
End Point ◽  
End Point Detection ◽  
Point Detection

scholarly journals Liquid-Liquid Extraction of Zr(IV) from Sulphuric Acid Medium using Cyanex 923 in Kerosene

2019 ◽  
Vol 6 (1) ◽  
pp. 37-42
Author(s):  
Jaykishon Swain ◽  
Amit Sahoo ◽  
Smrutiranjan Jena ◽  
BhikariCharana Bhatta
Keyword(s):  
Acid Medium ◽  
Sulphuric Acid ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction ◽  
Cyanex 923 ◽  
Sulphuric Acid Medium
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