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Eosin Yellow

Moafi et al. [143] studied the ability of titania versus zirconia to photocatalyze methylene blue and eosin yellow on polyacrylonitrile fibers. Ti02 particles ranging from 10-20 nm in size and Zr02 particles ranging from 20-40 nm in size were dispersed on the fiber surface. Photocatalytic activity of Ti02 was greater. [Pg.230]

The basis of this method is that when normal seawater is chlorinated at the usual levels of 1 to 10mg/l of chloride, the bromine in seawater (8.1 x 10 4 M, 65 mg/1 at salinity = 35%o) is rapidly and quantitatively oxidised to Br() and HBrO. If 50 mg/1 of bromide is added to distilled or fresh waters containing HCIO plus C1CT, then HBrO plus BrO" are both formed. The HBrO plus BrO" will in turn rapidly brominate fluorecein (9-[o-carboxyphenyl]-6-hydroxy-3-isoxanthenone) to give the pink tetrabromo derivative eosin yellow (2,4,5,7-tetrabromo-9-[o-carboxyphenyl]-6-hydroxy-3-isoxanthenone), provided the molar ratio of bromide to fluorescein is 4 1. The resultant increase in eosin can be measured visually or spectrophotometrically, and the decrease in fluo-roscein measured fluorometrically. If the molar ratio of bromide to fluoroscein is < 4 1, then the mono-, di-, and tri-bromo derivatives are formed repro-ducibly. These derivatives have extinction coefficients close to eosin and are accounted for in the standardisation. [Pg.77]

Aliphatic amines have been determined by a number of methods. Batley et al. [290] extracted the amines into chloroform as ion-association complexes with chromate, then determined the chromium in the complex colorimetri-cally with diphenylcarbazide. The chromium might also be determined, with fewer steps, by atomic absorption. With the colorimetric method, the limit of detection of a commercial tertiary amine mixture was 15ppb. The sensitivity was extended to 0.2 ppb by extracting into organic solvent the complex formed by the amine and Eosin Yellow. The concentration of the complex was measured fluorometrically. Gas chromatography, with the separations taking place on a modified carbon black column, was used by Di Corcia and Samperi [291] to measure aliphatic amines. [Pg.412]

Eosin Yellow 2, 4, 5, 7 -Tetrabromo3, 6 ihydroxyspiro[isobenzofuran 1(3H), 9 -[9H]xanthen-3-one disodium salt... [Pg.387]

Polyamid 1IF254 Visualizing agents Eosin yellow in 5% NaOH Eosin yellow in 5% NaOH — Aniline blue in water Eosin yellow in 5% NaOH —... [Pg.1188]

Photo-oxidation of thiouracil by singlet oxygen using eosin yellow, rose bengal and methylene blue as dye sensitizers affords two products, thiourea and acetylthiourea a mechanism has been proposed. ... [Pg.237]


See other pages where Eosin Yellow is mentioned: [Pg.389]    [Pg.144]    [Pg.482]    [Pg.1186]    [Pg.1189]    [Pg.1189]    [Pg.1189]    [Pg.309]    [Pg.1777]    [Pg.1779]    [Pg.1781]    [Pg.1782]    [Pg.1788]    [Pg.1788]    [Pg.139]    [Pg.586]    [Pg.1114]    [Pg.1117]    [Pg.1117]    [Pg.1117]    [Pg.173]    [Pg.236]    [Pg.347]   
See also in sourсe #XX -- [ Pg.387 , Pg.389 ]

See also in sourсe #XX -- [ Pg.586 ]




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Eosin

Eosine

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