Spectrophotometric determination of trivalent cerium with feriin in the presence of tetravalent cerium

1984 ◽  
Vol 49 (11) ◽  
pp. 2458-2462 ◽  
Author(s):  
Josef Novák ◽  
Pavel Vyhlídka ◽  
Vladimír Kohout ◽  
Bohumil Hájek
Keyword(s):  
Relative Error ◽  
Spectrophotometric Determination ◽  
Cerium Dioxide ◽  
Indirect Determination ◽  
Trivalent Cerium ◽  
Tetravalent Cerium

A method is suggested for the indirect determination of cerium(III) ions in the presence of a high excess of tetravalent cerium. Ce(III) is oxidized to Ce(IV) by tris(1,10-phenanthroline)iron(III) complex (ferriin) in the presence of sodium diphosphate, and the purple-red iron(II) complex (ferroin) formed is determined photometrically at 530 nm. Trivalent cerium can be so determined in quantities of 0-400 μg/50 ml with a relative error of ±3.5%. Cerium(III) was determined in commercial cerium(IV) sulphate and cerium dioxide preparations.

scholarly journals Spectrophotometric Determination of Epinephrine in Pharmaceutical Preparations Using Praseodymium as Mediating Metals

2011 ◽  
Vol 8 (1) ◽  
pp. 110-117 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Relative Error ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Pharmaceutical Preparations ◽  
Direct Methods ◽  
Orange Yellow ◽  
Sensitive Spectrophotometric Method

A simple, accurate and sensitive spectrophotometric method for the determinaion of epinephrine is described . The method is based on the coordination of Pr (III) with epinephrine at pH 6. Absorbance of the resulting orange yellow complex is measured at 482 nm . A graph of absorbance versus concentrations shows that beer 's low is obeyed over the concentration range (1-50)mg.ml-1 of epinephrine with molar absorpitivity of ( 2.180x103 L.mol-1.cm-1 ), a sandell sensitivity of (0.084 mg.cm-2 ), a relative error of (-2.83%) , a corrolation coffecient (r= 0.9989) and recovery % ( 97.03 ± 0.75 ) depending on the concentration.This method is applied to analyse EP in several commercially available pharmaceutical preparations using direct methods .All statistical calculations are implemented via a Minitab software version 11.

Spectrophotometric determination of iron(II) ferrozine complex for the indirect determination of phosphate

1981 ◽  
Vol 53 (6) ◽  
pp. 861-864 ◽  
Author(s):  
Fredrick. Bet-Pera ◽  
Amit K. Srivastava ◽  
Bruno. Jaselskis
Keyword(s):  
Spectrophotometric Determination ◽  
Indirect Determination

scholarly journals The spectrophotometric determination of boron in tourmalines

2005 ◽  
Vol 70 (2) ◽  
pp. 255-260 ◽  
Author(s):  
Ljiljana Jaksic
Keyword(s):  
Hydrochloric Acid ◽  
Magnetic Separation ◽  
Relative Error ◽  
Spectrophotometric Determination ◽  
Dilute Hydrochloric Acid ◽  
Anhydrous Sodium Carbonate ◽  
Ph Adjustment ◽  
Coloured Complex ◽  
Heavy Liquids

A procedure for the spectrophotometric determination of macro amounts of boron in tourmaline with azomethine H is described. The used tourmaline concentrate was obtained by magnetic separation and heavy-liquids purification of the schorl zone of pegmatite or granite aplite. The samples of tourmaline were decomposed by fusion with anhydrous sodium carbonate and taken up in dilute hydrochloric acid. The interfering effects of iron and aluminium were eliminated by masking with an EDTA - NTA solution. After pH adjustment, the boron was reacted with azomethine H and the absorbance of the obtained coloured complex was measured at 415 nm. The results are compared with those obtained by other procedures. The relative error of the determination was less than 3 %.

scholarly journals Spectrophotometric determination of bromate with 2-bromo-N,N-dimethylaniline

2021 ◽  
pp. 104-109
Keyword(s):  
Cancer Research ◽  
Sulfuric Acid ◽  
Detection Limit ◽  
Relative Error ◽  
Spectrophotometric Determination ◽  
Natural Water ◽  
International Association ◽  
Over Time ◽  
Sensitive Method

International Association for Cancer Research included bromates in the group of carcinogenic chemicals. Therefore, it is important to determine the content of bromates in different objects. The purpose of this study is to develop a simple, express and sensitive method for the determination of bromates. We propose the method of spectrophotometric determination of bromate in the concentration range of 0.5 to 45 mg L–1, this technique being based on the reaction of bromate with 2-bromo-N,N-dimethylaniline in the presence of an excess of KBr in the medium of sulfuric acid, followed by photometry of 2,4-dibromo-N,N-dimethylaniline at 240 nm. The optimal concentrations of reagents are determined and the influence of some other conditions on the sensitivity of determination is established. The detection limit of bromate (in compliance with 3s-criterion) is 0.39 mg L–1. The relative error of determination does not exceed 0.10. The influence of foreign ions is studied when determining bromate (5.010–5 mol L–1). Such components of natural water as phosphates, fluorides, chlorides and NH4+ ions have no effect on the bromide determination. Fe3+ ions in comparable quantities impede the determination of bromates. The developed method was tested for the determination of bromate in standard solutions and waters of different categories. The used reagents are stable over time and the proposed method is simple and suitable as an alternative for the determination of bromates in different objects.

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