This study examined adsorption of anionic dye on four zeolitic materials incorporated (VS-1, CuZSM-5) and not into metals (S-1, ZSM-5). The the bromothymol blue (BTB) adsorbents was analysed using isotherm models Langmuir, Freundlich, Temkin. Two kinetic were also applied to process, pseudo-first order pseudo-second order. isothermal data showed good correlation. kinetics better described by mo...

A new plating medium using bromothymol blue (BTB) indicator is described and compared with eosin-methylene blue (EMB), MacConkey, and Endo media. These media were tested with L-arabinose by plating fermenting and nonfermenting mutant strains of Escherichia coli. The minimum concentrations of L-arabinose that permitted differentiation of these strains were determined. Different concentrations we...

This paper demonstrates local pH measurement in a microchip using a pH-sensing gel-microbead. To achieve this, the gel-microbead made of a hydrophilic photo-crosslinkable resin was functionalized with the pH indicator bromothymol blue (BTB). The primary constituent of this photo-crosslinkable resin is poly(ethylene glycol). Gel-microbeads impregnated with BTB were obtained by stirring the mixtu...

fe3o4-containing cotton-like mesoporous silica system (fe3o4@ncsm) was studied with regard to its performance towards the photodecolorization of bromothymol blue (btb) aqueous solution. the surface properties of the functionalized catalyst were analyzed by a series of characterization techniques like ftir, xrd, bet, sem and tem. the n2 adsorption–desorption analysis shows that the mesostructure...

In this study, lignin was isolated from rice (Oryza sativa L.) husk using alkaline extraction method and used as an adsorbent for aqueous solutions of methyl orange (MO) bromothymol blue (BTB). The equilibrium removal rate MO found to be at 61.4%, with experimental adsorbate uptake, qe, 1.23 mg·g-1, achieved 150 minutes contact time. For BTB, the 78.3%, qe 1.57 Pseudo-first order (PFO) pseudo-s...

Three simple and sensitive extractive spectrophotometric methods have been described for the assay of terbinafine hydrochloride either in pure form or in pharmaceutical formulations. The developed methods involve formation of coloured chloroform extractable ion-pair complexes of the drug with bromothymol blue (BTB), bromophenol blue (BPB) and bromocresol green (BCG) in acidic medium. The extrac...

Bromocresol purple (BCP), bromophenol blue (BPB) and bromothymol blue (BTB) were used to determine alfuzosin hydrochloride either in pure form or in pharmaceutical formulations. Alfuzosin was extracted as an ion-pair complex from sample solution containing KCl-HCl buffer pH2.2, 2.4 and 2.6 into CHCl3 and the absorbance was measured at 407, 413 and 412nm with use of the cited reagents, respectiv...

Keto-bromothymol blue [BTB]keto was quantitatively prepared by potassium permanganate oxidation of bromothymol in an alkaline medium at pH > 12. When reacting with dinitrophenyl hydrazine and hydroxylamine, the obtained keto derivatives were characterized FTIR, TDDFT-DFDT computations, optical properties. The resulting compounds found to have a high chelation affinity most hydroxylamine forming...

Two simple, selective and sensitive spectrophotometric methods are described for the determination of 6-aminopenicillanic acid (6-APA). The methods are based on the reaction of 6-APA with either bromophenol blue (BPB) or bromothymol blue (BTB), to give orange-red and green species, respectively. The coloured products are quantified spectrophotometrically at 625 and 616nm for BPB and BTB, respec...

• Bromothymol blue's spectral properties were recorded in the presence of heavy water and some selected electrolytes. The removal dissolved gases from dye solution modifies its UV–vis absorption spectrum. Re-admitted induce specific effects on features dye. color pH indicator blue (BTB) changes yellow to with increasing pH. effect electrolytes (LiCl, NaCl, KCl, CsCl, KSCN KClO 3 ) D 2 O dilute ...