Spectrophotometric Determination of Fluoride by Zirconium-Eriochrome Cyanine R.

Sarma, Pradyut

doi:10.1021/ac60214a067

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…Currently it is used in certain types of field portable photometers that uses powder-pillow reagents for fluoride analysis (Gül et al, 2014). The ECR method has been used to determine the fluoride concentration in aqueous samples (Sarma, 1964;Dixon, 1970;Lenarczyk & Marczenko, 1986) and in urine (Megregian, 1954;Rowley & Farrah, 1962). According to the literature, Zr: ECR ratio of 1:4 is favourable in the analysis and maintaining an acidity higher 0.1 M HCl is important to prevent other metal ions such as Fe(III), Al(III) and Pb(II) reacting with Eriochrome Cyanine R to produce coloured complexes (Megregian, 1954).…”

Section: June 2023mentioning

confidence: 99%

Fluoride analysis in aqueous solutions - a comparison of two colorimetric methods

Fernando¹,

Liyanage²,

Cooray

2023

J. Natn. Sci. Foundation Sri Lanka

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Fluoride is beneficial for human health only in a narrow concentration range. Over the years, many analytical techniques have been developed to quantify fluoride in a variety of sample matrices. In this research, fluoride concentrations of twenty (20) natural water samples determined by SPADNS (SPA) and Eriochrome Cyanine R (ECR) colorimetric methods were evaluated to ascertain whether these methods can produce comparable fluoride concentrations. According to the paired t test for comparing individual differences, the two datasets are different at 95% confidence level suggesting that the two analytical methods produce statistically different fluoride concentrations for the analysed water samples. The potential interferences of Al3+, Ca2+, and Mg2+ on the fluoride analysis was evaluated using 0.85 mg L-1 fluoride standard solutions spiked with various amount of the above-mentioned metal ions. The highest interference was observed with Al3+ ions, which underestimated the fluoride concentration by 26% and 23% for ECR and SPA methods respectively at 20.0 mg L-1 Al3+ concentrations. The minimum interference was observed for Ca2+ ions which underestimated the fluoride concentration by 8% and 7% for ECR and SPA methods respectively at 100.0 mg L-1 Ca2+ concentrations. Acid distillation resulted in the samples spiked with Ca2+ and Mg2+ ions in the range of 0.50 to 100.0 mg L-1 reaching the theoretical concentration of 0.85 mg L-1. Acid distillation also worked well for the Al3+- fortified samples, except for Al3+ concentration at 20 mgL-1. The efficiency of the acid distillation method was also tested with three (03) natural water samples. The fluoride concentration increased significantly after the acid distillation; however, even after the acid distillation, statistically comparable fluoride concentrations were not observed.

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Section: June 2023mentioning

confidence: 99%

Fluoride analysis in aqueous solutions - a comparison of two colorimetric methods

Fernando¹,

Liyanage²,

Cooray

2023

J. Natn. Sci. Foundation Sri Lanka

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“…Triphenylmethane (TPM) dyes of most value today are those with auxochromic and bathochromic groups like amino and hydroxyl in para position to the methane carbon (Witterholt, 1969). TPM dyes with groups capable of holding metals in stable combination, such as eriochrome cyanine R and azurol S, have been used successfully as spectrophotometric reagents for fluoride determination (Thrun, 1950;Macnulty et al, 1956;Sarma, 1964;Dixon, 1970;Einaga and Iwasaki, 1981;Kiernan, 1984). TPM dyes absorb strongly in the visible region to produce intense, brilliant shades of red, violet, blue, and green (Witterholt, 1969).…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric determination of fluoride in drinking water using aluminium complexes of triphenylmethane dyes

Barghouthi¹,

Amereih²

2012

WSA

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A sensitive spectrophotometric determination of fluoride in drinking water has been developed using aluminium complexes of triphenylmethane dyes (chrome azurol B and malachite green) as spectrophotometric reagents. The method allowed a reliable determination of fluoride in the range of 0.5-4.0 mg•ℓ -1 for chrome azurol B and 0.0-2.0 mg•ℓ -1 for malachite green. The molar absorptivity for the complexes of chrome azurol B at 582 nm and malachite green at 622 nm is 1.44 × 10 4 and 2.56 × 10 4 ℓ•mol -1 •cm -1 , respectively. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.5 mg•ℓ -1 fluoride for the method using chrome azurol B were found to be 0.125 ± 0.003 μg•mℓ -1 , 0.2 mg•ℓ -1 , 0.5 mg•ℓ -1 , and 97.1 ± 4.2, respectively, and for malachite green were 0.143 ± 0.002 μg•mℓ -1 , 0.1 mg•ℓ -1 , 0.3 mg•ℓ -1 , and 97.9 ± 4.1, respectively.

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“…The distillate passes directly to a column of anion exchange resin, which serves to concentrate the fluorine, and from which it is eluted with a small volume of ammonium acetate solution. The final determination is made spectrophotometrically by an eriochrome cyanine R method.This photometric method is based upon the bleaching action of fluorine on the coloured complex formed between zirconium and eriochrome cyanine R. The conditions for this(9) reaction were studied in some detail by Sarma but have been modified for this particular application. In the range 2-5*t μg F per 100 ml of solution, a negative linear calibration is obtained.…”

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confidence: 99%

Fluorine

Jeffery¹

1981

Chemical Methods of Rock Analysis

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Spectrophotometric Determination of Fluoride by Zirconium-Eriochrome Cyanine R.

Cited by 12 publications

References 8 publications

Fluoride analysis in aqueous solutions - a comparison of two colorimetric methods

Fluoride analysis in aqueous solutions - a comparison of two colorimetric methods

Spectrophotometric determination of fluoride in drinking water using aluminium complexes of triphenylmethane dyes

Fluorine

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