Alizarin fluorine blue

Alizarin fluorine blue lanthanum complex preparation I84 ... 

Okabayasi et al. used two identical columns containing Alizarin-Fluorine Blue sulphonate-lanthanum complex in an alternate fashion in order to increase the sample throughput in the preconcentration/separation of fluoride prior to its determination by use of an ISE (Fig. 4.14.B). By switching valve SV, the analyte in a sample was measured and eluted while that in the next sample was retained in the odier column [129]. 

The analysis is performed using a continuous flow analytical instrument such as Technicon Autoanalyzer or equivalent. The sample is distilled and the distillate, free of interference, is reacted with alizarin fluorine blue [C14H704 CH2N(CH2 COOH)2]-lanthanum reagent to form a blue complex. The absorbance is measured at 620 nm. Standard fluoride solutions are prepared in the range from 0.1 to 2.0 mg F /L using the stock fluoride solution. 

Okabayashi et al. [29] collected fluoride ion selectively on an anion exchange resin loaded with alizarin fluorine blue sulphonate. 

Leonard, M. A. and Murray, G. T., Sulftv nated alizarin fluorine blue. Improved reagent for the positive absorptiometric determination of the fluoride ion. Analyst London. 99. 645, 1974 Chem Abstr, 82. 92553, 1975. 

Yellow Alizarin Complexone (AC) reacts with La or Ce(III) ions to form a red chelate, which, in turn, reacts with fluoride ions to give a blue ternary complex (Alizarin Fluorine Blue). The fluoride anion displaces the water molecule bound with the metal ion (formula 20.1) [19,20]. Other suggestions regarding the mechanism of this reaction have also been proposed [21,22]. 

A new type of ceramic membrane electrode that is selective for F" ions has been prepared by sintering LaFg, EuFj, and CaFz at above 1200 °C in an atmosphere of Hf The approximate determination of the F" ion concentration in polluted waters can be made by means of a F ion electrode in the presence of citrate ion however, for an accurate determination a photometric method was applied after separation of F by distillation. The probable composition of the La " -alizarin complexone (H4A)-F complex is said to be La(LaA)4F2. ° Alizarin fluorine blue 5-sulphonate is more soluble in water than the unsulphonated reagent the ternary La -F -complexone absorbs at 583 nm. The application of neutron activation analysis to the determination of fluorine has has been reviewed briefly by Verot and Jaumier. X-Ray photoelectron spectroscopy (p.e.s.) has been used to identify and to provide a quantitative estimate of CF3, CF2, and CF groups on the surface of fluorinated diamond. Proton and deuteron radiolysis of... 

Recent investigations have been devoted to the measurement of fluorides [91]. A ternary complex colored by fluoride ion is formed from a cerium(III)-alizarin complexone binary complex (alizarin fluorine blue). The reagent is immobilized on an Amberlite polymer matrix. The reflectance is measured in a flow-cell assembly with a bifurcated optical flber. The response is linear for 0.16-0.9S mM fluoride at pH 4.1. The response time is about 12 min. The major interferents are aluminium, iron, and phosphate. 

Barbituric Acid + Pyridine-4-carboxylic acid Fluoride Alizarin Fluorine blue + Lanthanum(III) ion... 

The condensation product of dihydroxyanthraquinone with formaldehyde and iminodiacetic acid was introduced by Belcher, Leonard and West (1958) under the name alizarin complexan (58), though the names alizarin complexone or (nowadays) alizarin fluorine blue are preferred. It greatly resembles xylenol orange in its general behaviour though its complexes with thorium and the lanthanons are more stable than these EDTA complexes. However, the most interesting... 

Reagent loaded anion exchangers may be used as selective sorbents for the preconcentration of certain analytes. Okabayashi [29] reported an anion-exchange resin loaded with alizarin fluorine blue sulphonate-lanthanum complex which was used for the preconcentration of fluoride, with subsequent determination using an ion-selective electrode. Hernandez et al.[30] used a chromoazurol modified anion exchanger to collect aluminium from serum samples. The analyte was eluted using IM NaOH and determined by flame AAS. 

Okabayashi et al.[29] rep)orted on a dual preconcentration column system for the determination of low concentrations of fluoride using a fluoride electrode. 1 ml of sample was sorbed selectively on an anion-exchanger loaded with alizarin fluorine blue sulphonate-lanthanum complex. The columns were loaded alternately, and successively eluted with IM sodium chloride - O.S M sodium chloride. A detection limit of 1 /xg r was achieved at a sampling frequency of 24 h ... 

Leon-Gonzalez et al.[31] proposed an FI spectrophotometric method for the determination of Triton-type non-ionic surfactants based on their reaction with alizarin fluorine blue. An on-line ion-exchange column was incorporated in the system to eliminate interferences from ionic and amphoteric surfactants. In case of interferences from non-ionic surfactants, an on-line Amberlite XAD-4 adsorption column was used to retain selectively the Triton-type surfactant, which was subsequently eluted by ethanol. However, no information was given regarding interferences from refractive index effects at the ethanol/aqueous interface and their elimination. 

Alizarin fluorine blue Spectrophotometry 0.2-12.0 mg r Determination of Triton-type surfactants... 

H-(Carboxymethyl)- -[(9,10-dihydro-3,4-dihydroxy-9,l0-dioxo-8-sulfo-2-anthraceny[)methyl glycine, 9CI. Alizarine fluorine blue sulfonate. 5-Sulfoalizarin complexone [55671-62-0]... 

Strictly the name Alizarine fluorine blue S refers to the potassium salt. 

Alizarine fluorine blue, A-00076 Alizarine fluorine blue S, A-00077 Alizarine fluorine blue sulfonate, see A-00077 Alizarine green, A-00078... 

Alizarine fluorine blue, A-00076 4-Iodobenzoic acid Amide, in... 

Alizarine fluorine blue is the 3-methylamino-A, A -bisacetic acid derivative of alizarine, the Ce or La chelate of which binds with fluoride ions to form a ternary complex. This was the first reagent that could be used for the direct spectrophotometric determination of fluoride. 

Conditions can often be found under which the absorbance of a dye is affected by the presence of a nonionic surfactant, usually APE. For example, the anionic dye dichlorofluores-cein has been proposed for the determination of APE (109). The surfactant lowers the absorptivity of a dichlorofluorescein solution, while other nonionic surfactants and low amounts of anionic surfactants have little effect. Cationic surfactants interfere with the analysis. Similarly, the anionic dye alizarin fluorine blue is proposed for determination of APE because of the increase in intensity and change in wavelength of the dye s absorbance. Ionic and other nonionic surfactants must be absent (110). 

Nonionic surfactants may be determined by FIA using the spectrophotometric procedure based on extraction of the ion pair of the potassium adduct of polyethoxylates with the anionic dye tetrabromophenolphthalein ethyl ester (94). The utility of this method is dependent upon the particular matrix to be analyzed. An FIA procedure for determining APE is based on the change in wavelength and intensity of the absorbance of a solution of alizarin fluorine blue (95). Since other surfactants interfere with this phenomenon, they are removed by online ion exchange or adsorption chromatography. Online ion exchange cleanup may also be used in FIA determination of APE by the potassium picrate extraction/ spectrophotometric procedure (96). 

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