A spectrophotometric determination of the formation constants of the inclusion complexes of?- and?-cyclodextrins with the azonium and ammonium tautomers of methyl orange and methyl yellow

1991 ◽  
Vol 11 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Khalid M. Tawarah ◽  
Hakam M. Abu-Shamleh
Keyword(s):  
Methyl Orange ◽  
Inclusion Complexes ◽  
Spectrophotometric Determination ◽  
Formation Constants ◽  
Methyl Yellow

scholarly journals Spectrophotometric determination of the formation constants of calcium(II) complexes with 2,2'-bipyridyl and 1,10-phenanthroline in acetonitrile

2016 ◽  
Vol 2 (4) ◽  
pp. 240-246 ◽  
Author(s):  
Jacqueline González-González ◽  
Mónica Nájera-Lara ◽  
Varinia López-Ramírez ◽  
Juan Antonio Ramírez-Vázquez ◽  
José J.N. Segoviano-Garfias
Keyword(s):  
Spectrophotometric Determination ◽  
Formation Constants

scholarly journals Kinetic-Spectrophotometric Determination of Iodide Based on its Inhibitory Effect on the Decolorization Reaction of Methyl Orange

2009 ◽  
Vol 6 (4) ◽  
pp. 1267-1273
Author(s):  
Reyhaneh Rahnama Kozani ◽  
Ferydoun Ashrafi ◽  
Masuod Khalilnezhad ◽  
Mohammad Reza Jamali
Keyword(s):  
Methyl Orange ◽  
Spectrophotometric Determination ◽  
Limit Of Detection ◽  
Inhibitory Effect ◽  
Calibration Graph ◽  
Reaction Products ◽  
Optimum Conditions ◽  
Relative Standard ◽  
Kinetic Spectrophotometric

A simple, sensitive, rapid and reliable method has been developed for spectrophotometric determination of iodide based on its inhibition effect on the redox reaction between bromate and hydrochloric acid. The decolorization of methyl orange by the reaction products was used to monitor the reaction spectrophotometrically at 525 nm. The variables affecting the rate of the reaction were investigated. Under the optimum conditions, the limit of detection is 1.5 × 10-7mol L-1and calibration range is 2.0 × 10-6–1.3 × 10-4mol L-1of iodide. The linearity range of the calibration graph is depends on bromate concentration. The relative standard deviation of ten-replication determination of 8.2 × 10-5mol L-1iodide was 1.4%. The proposed method was applied to the determination of iodide in natural water samples with satisfactory results.

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