Sorption-photometric determination of ascorbic acid using molybdosilicic heteropolyacid and polyurethane foam after microwave irradiation

1998 ◽  
Vol 373 (2-3) ◽  
pp. 131-138 ◽  
Author(s):  
S.G. Dmitrienko ◽  
L.V. Goncharova ◽  
A.V. Zhigulev ◽  
R.E. Nosov ◽  
N.M. Kuz̀min ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Microwave Irradiation ◽  
Polyurethane Foam ◽  
Photometric Determination

scholarly journals Photometric determination of aluminum in iron and steel with aluminon using ascorbic acid as a masking agent

1966 ◽  
Vol 15 (8) ◽  
pp. 852-855 ◽  
Author(s):  
Shizuya MAEKAWA ◽  
Kiyotoshi KATO ◽  
Masanori SAKURAI
Keyword(s):  
Ascorbic Acid ◽  
Photometric Determination ◽  
Iron And Steel

Photometric Determination of Reduced and Total Ascorbic Acid

1943 ◽  
Vol 15 (3) ◽  
pp. 182-188 ◽  
Author(s):  
Melvin Hochberg ◽  
Daniel Melnick ◽  
Bernard Oser
Keyword(s):  
Ascorbic Acid ◽  
Photometric Determination

scholarly journals Extraction-photometric determination of osmium using quaternary water-thiopyrine-trichloroacetic and orthophosphoric acid system

2020 ◽  
Vol 99 (3) ◽  
pp. 61-65
Author(s):  
L.S. Egorova ◽  
◽  
E.A. Leites ◽  
Keyword(s):  
Ascorbic Acid ◽  
Organic Solvent ◽  
Orthophosphoric Acid ◽  
Photometric Determination ◽  
Model Mixture ◽  
Acid System ◽  
Optimal Conditions ◽  
Liquid Component ◽  
Effect Of Copper

The article is devoted to the extraction-photometric determination of osmium. The aim was to modify the well known extraction-photometric determination of osmium by replacing chloroform, used as an organic solvent in a traditional extraction system, on to water, which is the only liquid component in the layering system. This made it possible to eliminate the toxic organic solvent from the system. The optimal conditions for the osmium extraction were selected, taking with the fact that the consumption of thiopyrine, as an expensive reagent, should be minimal. The results of the developed methodology for determining microgram amounts of osmium with thiopyrine were presented by the example of a model mixture corresponding to the composition of a platinum sponge. The interfering effect of Al (lII), B (lII), Bi (IIl), Fe (llI), Au (lII), lr (II), Cd (ll), Co (II), Ca (II), Si ( IV), Mg (II), Mn (II), Cu (Il), Mo (VI), As (V), Ni (lI), Sn (lV), Pd (Il), Rh (II), Pb (II), Ag (I), Sb (IIl), Te (IV), Cr (IlI), Zn (Il) contained in a platinum sponge was investigated. The interfering effect of copper has been established, which is eliminated by masking with ascorbic acid.

Stepwise injection photometric determination of ascorbic acid in drugs

2011 ◽  
Vol 66 (3) ◽  
pp. 275-279 ◽  
Author(s):  
A. V. Bulatov ◽  
U. M. Strashnova ◽  
A. B. Vishnikin ◽  
G. M. Alekseeva ◽  
T. D. Sineva ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Photometric Determination

scholarly journals IODIMETRY-PHOTOMETRIC DETERMINATION OF PERIODATE, IODATE AND BROMATE IN WATER SOLUTIONS

2018 ◽  
pp. 56-59
Author(s):  
O. Тrohimenko ◽  
O. Zaporozhets ◽  
A. Тrohimenko
Keyword(s):  
Selective Oxidation ◽  
Polyurethane Foam ◽  
Aqueous Media ◽  
Analytical Signal ◽  
Photometric Determination ◽  
Photometric Method ◽  
Spectrophotometric Detection ◽  
Step Procedure ◽  
Excess Iodide

A simple and accurate three-step procedure for sequential spectrophotometric determinations of periodate, iodate and bromate in aqueous media has been developed. At the first stage the determination of periodate is based on the selective oxidation of the excess amount of iodide at pH=4.8 to produce iodine (triiodide), that can be found by spectrophotometric detection (λmax=350 nm). After detecting the analytical signal, iodine is removed from the solution by sorption on the polyurethane foam. In the second stage the determination of iodate is based on the selective oxidation of iodide at pH=3.0 to produce iodine (triiodide), that also can be found by spectrophotometric detection (λmax=350 nm). After detecting the analytical signal, also iodine is removed from the solution by sorption on the polyurethane foam. In the third stage the determination of bromate is based on the selective oxidation of iodide at pH=1.0 to produce iodine (triiodide), that also can be found by spectrophotometric detection (λmax=350 nm). It has been established that the equilibrium in the reaction (ІО4– + 7І– + 8Н+ → 4І2 +4Н2О) is established in 3 minutes at pH=4.8. The equilibrium in the both reactions (ІО3– + 5І– + 6Н+ → 3І2 +3Н2О and BrО3– + 6І– + 6Н+ → 3І2 +Br– +3Н2О) is established in 7 minutes at pH=3.0 and at pH=1.0 respectively. It was found that oxohalogates are quantitatively converted to I2 with ~ 100-fold molar excess iodide at appropriate optimal pH values. Schematically, the determination of IO4–, IO3– and BrO3– in their combined presence can be represented as follows: where SF is spectrophotometry in a solution at 350 nm: PUF is the polyurethane foam. Based on the data obtained, the model mixtures of periodate, iodate and bromate by sequential iodiometry-photometric method were analyzed. The error of determination in mixtures of each oxo-halogenate did not exceed 5%.

Fluorometric determination of ascorbic acid in the absence of the oxidant in juices of common citrus

Planta Medica ◽  
2010 ◽  
Vol 76 (12) ◽  
Author(s):  
A Copra-Janicijevic ◽  
E Sofic ◽  
L Klepo ◽  
A Topcagic ◽  
I Tahirovic ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Fluorometric Determination
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