A spectrophotometric study of the complexation equilibria and the determination of nickel(II) with 4-(2-pyridylazo)resorcinol, 4-(2-thiazolylazo)resorcinol, and 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol

1987 ◽  
Vol 52 (4) ◽  
pp. 878-912 ◽  
Author(s):  
Marie Langová ◽  
Zdeněk Šimek ◽  
Jitka Chromá ◽  
Lumír Sommer
Keyword(s):  
Drinking Water ◽  
Spectrophotometric Study ◽  
Brij 35 ◽  
Complexation Equilibria ◽  
Determination Of Nickel ◽  
Absorbance Data

The complexation equilibria of Ni(II) with 4-(2-pyridylazo)resorcinol (PAR) and 4-(2-thiazolylazo)resorcinol (TAR) in 30 vol.% ethanol and with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol (BrPADAP) in 10 vol.% ethanol containing 0·1% BRIJ-35 tenside were studied spectrophotometrically. The absorbance data were processed by the SPEFO 8, HALTAFALL SPEFO and SQUAD-G programs. The working procedures for the determination of Ni(II) with the reagents in pure solutions were optimized and statistically evaluated, and PAR was applied to the determination of Ni(II) in drinking water.

Spectrophotometric study of the complexation equilibria of cadmium ions with 5-bromo and 5-chloro derivatives of 2-(2-pyridylazo)-5-diethylaminophenol (BrPADAP, ClPADAP)

1983 ◽  
Vol 48 (1) ◽  
pp. 52-59 ◽  
Author(s):  
Vlastimil Kubáň ◽  
Miroslav Macka
Keyword(s):  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Graphical Analysis ◽  
Optimal Conditions ◽  
Cadmium Ions ◽  
Brij 35 ◽  
Ethanol Medium ◽  
Triton X ◽  
Derivatives Of

The composition, optical characteristics, molar absorption coefficients and equilibrium constants of the reactions of formation of the ML and ML2 complexes of both reagents with cadmium(II) ions were determined by graphical analysis and numerical interpretation of the absorbance-pH curves by the modified SQUAD-G program. Optimal conditions were proposed for the spectrophotometric determination of Cd in 10% v/v ethanol medium in the presence of 0.1% w/v Triton X-100 or 1% w/v Brij 35. BrPADAP and ClPADAP are the most sensitive spectrophotometric reagents for the determination of cadmium(II) ions (ε = 1.28-1.44 . 105 mmol-1 cm2 at 560 nm and pH 8.0-9.5) with a high colour contrast in the reaction (Δλmax ~117 nm) and a selectivity similar to that of other N-heterocyclic azodyes (PAR, PAN, etc.).

Spectrophotometric study of the complexation equilibria of zirconium(IV) with 1-amino-4-hydroxyanthraquinone and the determination of zirconium

The Analyst ◽  
1988 ◽  
Vol 113 (11) ◽  
pp. 1643 ◽  
Author(s):  
Kamal A. Idriss ◽  
Mohamed M. Seleim ◽  
Magda S. Saleh ◽  
M. S. Abu-Bakr ◽  
Hassan Sedaira
Keyword(s):  
Spectrophotometric Study ◽  
Complexation Equilibria

Spectrophotometric study of the complexation equilibria of lanthanum(III) with 1,4-bis(4′-methylanilino)anthraquinone and the determination of lanthanum(III)

The Analyst ◽  
1985 ◽  
Vol 110 (6) ◽  
pp. 709-712 ◽  
Author(s):  
Kamal Abdel-Rahman Idriss ◽  
A. A. Harfoush ◽  
A. S. El-Shahawy ◽  
Hassan Sedaira
Keyword(s):  
Spectrophotometric Study ◽  
Complexation Equilibria

Spectrophotometric study of analytical reactions of triphenylmethane dyes with uranyl in the presence of cationic surfactants

1988 ◽  
Vol 53 (7) ◽  
pp. 1424-1460 ◽  
Author(s):  
Luděk Jančář ◽  
Josef Havel ◽  
Lumír Sommer
Keyword(s):  
Numerical Analysis ◽  
Cationic Surfactants ◽  
Spectrophotometric Study ◽  
Micellar Medium ◽  
Uranyl Ions ◽  
Optimum Conditions ◽  
Triphenylmethane Dyes ◽  
Chromazurol S ◽  
Absorbance Data

Numerical analysis of absorbance data for the analytically significant UO22+ - Chromazurol B, UO22+ - Chromazurol S, and UO22+ - Eriochromcyanine R systems in the presence of the cationic surfactant SeptonexR revealed that also in micellar medium, complex equilibria establish and several complexes are formed in dependence on pH and concentration of uranyl ions, reagent, and surfactant. Based on the results, optimum conditions are found for the spectrophotometric determination of low concentration of uranium.

scholarly journals Extraction and Determination of Nickel (Ii) Via Cloud Point Method

2018 ◽  
Vol 7 (4.36) ◽  
pp. 725
Author(s):  
Fatimah A.Wannas ◽  
Shawket K.Jawad
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Wave Length ◽  
Spectrophotometric Study ◽  
Effect Study ◽  
Heating Time ◽  
Ion Pair ◽  
Determination Of Nickel ◽  
Triton X

Spectrophotometric  study for ion pair complex of Ni(II) ion extracted into cloud point extraction larger appear wave length of maximum absorbance was λ=660 nm, for extracted Ni(II) ion as ion pair association ,used laboratory synthesized azo derivative 2-(4-hydroxy phenyl azo)-4-Benzen naphthol(HPAB).The study about Determination the optimum condition for extraction and  determination was pH  =10 in presence 100 µg Ni(II) in 10 ml aqueous solution ,0.6 mL of Triton x-114 and temperature of heating was 70 c° at heating time equal to 30 minute, stoichiometry shows the ion pair complex extracted was 1:1 (Ni-HPAB) +2;2Cl_, in addition to electrolyte effect study as well as spectrophotometric determination of Ni(II) in different samples .  

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