34 Result(s)
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A. K. Majumdar
Analytical Chemistry
Laboratory Medicine
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Article
Spectrophotometric determination of nickel(II), palladium(II) and copper(II) in presence of each other and other ions with 1-(o-carboxyphenyl)-3-hydroxy-3-phenyltriazene
Ni, Pd und Cu bilden mit dem Reagens bei pH 6,8–8,3, 2,4–3,5 bzw. 2,2–3,8 grünlich-gelbe, gelblich-orange bzw. hellgrüne Komplexe mit Absorptionsmaxima bei 410, 410 bzw. 400 nm. Das Beersche Gesetz wird in den...
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Article
Ion-exchange separation of metal ions with thiosulphate
In a cationic column of Amberlite IR-120 with thiosulphate as the eluting agent it has been possible to separate metal ions from several two to five component mixtures.
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Article
Ion exchange separation of metal ions with thiocyanate
The elution behaviour of quite a large number of metal thiocyanates on Amberlite IR-120 and IRA-400 has been studied, and the results obtained thereby suggest that in the anionic resin column separation of ion...
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Article
Spectrophotometric determination of beryllium with chromotropic acid azo dyes of the pyridine series
Beryllium forms coloured complexes with azo dyes of the pyridine series e. g. 2-(pyridyl-2-azo)-chromotropic acid (A), 2-(pyridyl-3-azo)-chromotropic acid (B) and 2-(2-carboxy pyridyl-3-azo)-chromotropic acid ...
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Article
Nature of copper-Bismuthiol complexes
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Article
Spectrophotometric determination of iron with chelidamic acid
Chelidamic acid forms with iron a complex at pH 5.8 to 8.5 having the maximum absorption at 460 nm. The metal to reagent ratio is 1∶3 and the instability constant is about 8.21 · 10−15. The complex obeys Beer's l...
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Article
Spectrophotometric determination of iron with β-aminopicolinic acid
β-Amino-picolinsäure bildet mit FeIII-Ionen einen Komplex, der bei 420 nm dem Beerschen Gesetz gehorcht, ein Verhältnis Metall: Reagens =1∶2 aufweist und eine Instabilitätskonstante von 3,764 · 10−8 besitzt. Mit...
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Article
Gravimetric determination of palladium with quinolinimide as a reagent
Quinolinimide which is found to be a selective reagent for palladium forms a complex of the composition Pd(C7H3O2N2)2. The reagent quantitatively precipitates palladium from solutions of pH 0.5 to 2.5 in presence...
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Article
Estimation of niobium and tantalum in presence of various ions and in steel by N-benzoyl-N-phenyl hydroxylamine
Methods for the determination and the separation of niobium and tantalum from quite a large number of ions and the estimation of niobium in steel with the reagent N-benzoyl-N-phenyl hydroxylamine have been des...
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Article
Spectrophotometric determination of ruthenium
A new method for the spectrophotometric determination of ruthenium with anthranilic acid has been described. The reagent, at PH range 5.2–6, forms with ruthenium(III) a green complex having absorption maximum at ...
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Article
Spectrophotometric determination of zirconium with 9-methyl-2,3,7-trihydroxy-6-fluorone
9-Methyl-2.3.7-trihydroxy-6-fluorone has been used as a new colorimetric reagent for zirconium. The rose-red complex shows maximum absorption, against the reagent blank, at 500 nm and obeys Beer's law from 0.1...
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Article
Determination of niobium and tantalum with quinaldinohydroxamic acid
A new method has been described for the gravimetric estimation, from a tartrate solution, of niobium and tantalum by quinaldinohydroxamic acid. In theph range of 5.0 to ammoniacal, both the elements are quantitat...
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Article
Spectrophotometric determination of osmium
m-Amino benzoic acid in large excess reacts with tetra-, hexa- and octavalent osmium at theph range 4.5–6 to give a purple complex having absorption maximum at 500 nm. Beer's law is obeyed for 0.5 to 8 ppm of osm...
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Article
Paper chromatography in the separation of ions
A study has been made of the separation of alkali and alkaline earth metals. With mixtures of solvents, such as ethyl cellosolve, water and hydrochloric acid and acetone, water and hydrochloric acid in the rat...
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Article
O-carboxyphenyl azo chromotropic acid (sodium salt) as an analytical reagent
0-carboxyphenyl azo chromotropic acid (sodium salt), named as chromotrope 2 C, is used as a new colorimetric reagent for the determination of micro amounts of thorium and aluminium. The blue-violet and red-vio...
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Article
Spectrophotometric determination of platinum
Anthranilic acid when heated on the steam bath with chloroplatinic acid at pH 5.0 gives a reddish violet complex having absorption maximum at 500 nm. The violet coloured system obeys Beer's law from 4 to 64 ppm o...
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Article
O-carboxyphenyl azo chromotropic acid (sodium salt) as an analytical reagent
O-carboxyphenyl azo chromotropic acid (sodium salt), chromotrope 2C, is introduced as a new metallochromic indicator. Its colour reactions with a few metal ions have been utilised for their quantitative chelat...
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Article
Spectrophotometric determination of beryllium and zirconium using chromotrope-2C
Disodium salt of o-carboxyphenylazo chromotropic acid (chromotrope 2C) has been used for the colorimetric determination of microamounts of beryllium and zirconium. The red-violet complexes show maximum absorpt...
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Article
Quinolinic acid as a reagent for the gravimetric and volumetric estimation of palladium
Like Β-amino-picolinic acid, quinolinic acid behaves as a highly selective reagent for palladium with which it forms a complex of composition Pd(C7H4O4N)2. The complex being very stable is precipitated from solut...
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Article
Bismuthiol I as an analytical reagent
Bismuth and palladium have been determined volumetrically after precipitation as bismuthiol I complexes. From 0.1 N hydrochloric acid solutions they are separated from Fe2+, Al, Cr, Ce3+, Zr, Ti, Zn, Th, UO2 2+, ...
