Rapid Photometric Determination of Fluoride in Water.  Use of Sodium 2-(<i>p</i>-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonate-Zirconium Lake

Bellack, Ervin; Schouboe, P. J.

doi:10.1021/ac60144a050

Cited by 131 publications

(26 citation statements)

References 13 publications

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“…The samples were collected in precleaned polythene bottles with 1 l capacity and transported to the laboratory. Fluoride concentration was determined spectrophotometrically by using acid zirconyl and sodium 2-parasulfophenylazo-1,8-dihydroxy-3,6-naphthalene disulfonate (SPADNS) reagents (Bellack and Schouboe 1968). Sodium fluoride was used to prepare the standard solution.…”

Section: Methodsmentioning

confidence: 99%

Fluoride distribution in groundwater and survey of dental fluorosis among school children in the villages of the Jhajjar District of Haryana, India

Yadav

Lata

Kataria

et al. 2008

Environ Geochem Health

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Fluoride concentration of groundwater reserves occurs in many places in the world. A critical area for such contamination in India is alluvial soil of the plain region, consisting of five blocks (Jhajjar, Bahadurgarh, Beri, Matanhail, and Sahalawas) of the Jhajjar District adjacent to the National Capital Territory of India, New Delhi. The purpose of this study was to assess the association between water fluoride levels and prevalence of dental fluorosis among school children of the Jhajjar District of Haryana, India. The fluoride content in underground drinking water sources was found to vary in villages. Hence, the villages were categorized as high-fluoride villages (1.52-4.0 mg F/l) and low/normal-fluoride villages (0.30-1.0 mg F/l). The source of dental fluorosis data was school-going children (7-15 years) showing different stages and types of fluorosis who were permanent resident of these villages. The fraction of dental fluorosis-affected children varied from 30% to 94.85% in the high-fluoride villages and from 8.80% to 28.20% in the low/normal-fluoride villages. The results of the present study revealed that there existed a significant positive correlation between fluoride concentration in drinking water and dental fluorosis in high-fluoride villages (r = 0.508; p < 0.001) and insignificant correlation in low-fluoride villages.

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Section: Methodsmentioning

confidence: 99%

Fluoride distribution in groundwater and survey of dental fluorosis among school children in the villages of the Jhajjar District of Haryana, India

Yadav

Lata

Kataria

et al. 2008

Environ Geochem Health

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“…The alizarin red S reaction product with fluoride has also been titrated with thorium nitrate, which depends upon the formation of the insoluble thorium fluoride (28). Two other zirconium lakes which have a low sensitivity to foreign ions and a high sensitivity to fluoride are the zirconium-eriochrome cyanine R (29) and zirconium-SPADNS [4,5dihydroxy-3-~p-sulfophenylazo)-2,inaphthalenedisulfonic acid, trisodiurn salt] (30). The SPADKS reagent, which is stable indefinitely.…”

Section: Journal Of Pharmaceutical Sciencesmentioning

confidence: 99%

Qualitative and Quantitative Tests for Stannous Fluoride

Hefferren

1963

Journal of Pharmaceutical Sciences

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“…[8][9][10] There are a few spectrophotometric reports in the literature based on a decolorizing effect of fluoride on a colored metal-dye complex. 1,[11][12][13][14][15] Some of these mentioned techniques have special problems in determination of fluoride. 14 Because of some advantages of spectrophotometric methods, such as simplicity, facility, accuracy and reproducibility, we have been interested to design a new spectrophotometric method for fluoride assay.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of Trace Amounts of Fluoride Using an Al-Xylenol Orange Complex as a Colored Reagent

et al. 2009

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A new spectrophotometric reagent for the determination of trace amounts of fluoride has been introduced. This method is based on the decolorization of a complex of Al(III) with xylenol orange (XO) as an ultra-sensitive colored reagent. Since the Al-XO complex plays an important role in this method, the protonation and complexation of XO with Al(III) at an ionic strength of 0.1 mol L -1 at 25 C has been studied by a spectrophotometric global analysis method. The EQUISPEC program was used to evaluate the protonation constants of XO and the stability constants of the formed complexes with Al(III). The protonation and the stability constants of the major complex species such as ML, MLH and MLH2, were determined. Finally, a spectrophotometric method for the assay of fluoride based on a decrease of the color intensity of the Al-XO complex, in an aqueous solution has been designed. The effects of some important variables on the determination of fluoride based on the proposed method were investigated. The method was applied to the determination of fluoride under the optimum conditions (pH 5.2, ionic strength 0.1 mol L -1 , 25 C). The determination of fluoride in the range of 0.08 -1.4 μg mL -1 (SD = 1.2%) was successfully performed. Interferences of Fe(III) were easily eliminated by using ascorbic acid. The proposed method was applied to the determination of trace amounts of fluoride content of some real water samples.

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Rapid Photometric Determination of Fluoride in Water. Use of Sodium 2-(p-Sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonate-Zirconium Lake

Cited by 131 publications

References 13 publications

Fluoride distribution in groundwater and survey of dental fluorosis among school children in the villages of the Jhajjar District of Haryana, India

Fluoride distribution in groundwater and survey of dental fluorosis among school children in the villages of the Jhajjar District of Haryana, India

Qualitative and Quantitative Tests for Stannous Fluoride

Spectrophotometric Determination of Trace Amounts of Fluoride Using an Al-Xylenol Orange Complex as a Colored Reagent

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