Equilibria in micellar systems. Photometric determination of vanadium with 6-hydroxy-5-dibenzo(a,j)phenoxazone-8,11-disulphonic acid activated by cetyltrimethylammonium bromide

1977 ◽  
Vol 42 (6) ◽  
pp. 1941-1948 ◽  
Author(s):  
J. Lasovský ◽  
E. Ružička
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Photometric Determination ◽  
Micellar Systems ◽  
Disulphonic Acid

Photometric determination of microgramme quantities of 1,3,5-trinitro-1,3,5-triazacyclohexane in air

1984 ◽  
Vol 49 (6) ◽  
pp. 1464-1467
Author(s):  
Stanislav Eminger ◽  
Marie Vejrostková
Keyword(s):  
Sulphuric Acid ◽  
Silica Gel ◽  
Photometric Determination ◽  
Sampling Tube ◽  
Disulphonic Acid ◽  
Activated Silica Gel

A method is suggested for the determination of 1,3,5-trinitro-1,3,5-triazacyclohexane in workroom atmosphere. The substance is trapped in a sampling tube containing glass microfibres and activated silica gel, decomposed with sulphuric acid to give formaldehyde, the latter is reacted with 1,8-dihydroxynaphthalene-3,6-disulphonic acid, and the derivative of dibenzoxanthiliumtetrasulphonic acid formed is determined protometrically at 580 nm.

scholarly journals Determination of critical micelle concentration of cetyltrimethylammonium bromide: Different procedures for analysis of experimental data

2016 ◽  
Vol 70 (4) ◽  
pp. 485-492 ◽  
Author(s):  
Jelena Goronja ◽  
Aleksandra Janosevic-Lezaic ◽  
Biljana Dimitrijevic ◽  
Andjelija Malenovic ◽  
Dragomir Stanisavljev ◽  
...  
Keyword(s):  
Critical Micelle Concentration ◽  
Cetyltrimethylammonium Bromide ◽  
Integration Method ◽  
Water Mixture ◽  
Micellar System ◽  
Sharp Transition ◽  
Water Conductivity ◽  
Micellar Systems ◽  
Significant Difference

Conductivity of two micellar systems was measured in order to determine critical micelle concentration (CMC) of cetyltrimethylammonium bromide (CTAB). Those systems were: CTin water and CTin binary mixture acetonitrile (ACN)-water. Conductivity (?)-concentration (c) data were treated by four different methods: conventional method, differential methods (first and second derivative) and method of integration (methods A-D, respectively). As CTin water micellar system shows a sharp transition between premicellar and postmicellar part of the ?/c curve, any of the applied methods gives reliable CMC values and there is no statistically significant difference between them. However, for CTin ACN-water mixture micellar system the integration method for CMC determination is recommended due to a weak curvature of ?/c plot.

scholarly journals SPECTROPHOTOMETRİC STUDY OF THE COMPLEX FORMATİON OF COPPER (II) WİTH 1-PHENYL-2- [2-HYDROXY-3-SULFO-5-NİTROPHENYLAZO] 1,3-BUTADİONE İN THE PRESENCE OF CATİONİC SURFACTANTS.

2016 ◽  
Vol 12 (11) ◽  
pp. 4543-4548
Author(s):  
А. V. Аyvazova ◽  
R. A. Aliyeva ◽  
F. M. Chiragov ◽  
S. R. Lahicova
Keyword(s):  
Complex Formation ◽  
Cetyltrimethylammonium Bromide ◽  
Cetylpyridinium Chloride ◽  
Photometric Determination ◽  
Spectrophotometric Study ◽  
Mixed Ligand ◽  
Concentration Interval ◽  
Homogeneous Composition ◽  
Determination Of Copper

Based on benzoylacetone synthesized 1-phenyl-2- [2-hydroxy-3-sulfo-5-nitrophenylazo] 1,3-butadione (PHSNPAB). Studied complex formation of copper (II) with 1-phenyl-2- [2-hydroxy-3-sulfo-5-nitrophenylazo] 1,3-butadione (PHSNPAB) in the presence and absence of the third component such as cetylpyridinium chloride (CPCl), cetylpyridinium bromide (CPBr) and cetyltrimethylammonium bromide (CTMABr). Single ligand complexes are formed at pH = 3, λ = 444nm, and mixed ligand complexes at pH = 2 λ = 456, 454, and 461 nm, respectively (CPCl, and CPBr, CTMABr). İdentified the relations of the reacting components in homogeneous composition of Cu-R (1: 2) and mixed ligand Cu-R-CPCl (1: 2: 2), Cu-R-CPBr (1: 2: 2) and Cu-R-CTMABr (1 2: 1) complexes, which concentration interval subordinated to Beer's law. The influence of external ions and masking substances on complex formation was studied. Method for the photometric determination of copper in the rocks was established.

Photometric determination of copper (II) microquantities in pyrite

2019 ◽  
Vol 85 (10) ◽  
pp. 23-28
Author(s):  
F. S. Aliyeva ◽  
F. O. Mamedova ◽  
F. N. Bahmanova ◽  
Yu. A. Yusibov ◽  
F. M. Chyragov
Keyword(s):  
Photometric Determination ◽  
Determination Of Copper

Spectrophotometric study of the reactions of lanthanoids with bromopyrogallol red in the presence of cation active tensides

1982 ◽  
Vol 47 (2) ◽  
pp. 503-508 ◽  
Author(s):  
Irena Němcová ◽  
Pavla Plocková ◽  
Tran Hong Con
Keyword(s):  
Absorption Spectra ◽  
Photometric Determination ◽  
Spectrophotometric Study ◽  
Ternary Complexes ◽  
Optimal Conditions ◽  
Bromopyrogallol Red ◽  
Binary Complexes

The absorption spectra of the binary complexes of lanthanoids with bromopyrogallol red were measured and the formation of ternary complexes with cation active tenside, Septonex, was studied. Optimal conditions were found for the formation of these complexes and the possibility of their use in the photometric determination of lanthanoids was demonstrated on several examples.

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