Eriochrome Cyanine Research Articles

Determination of aluminium and gallium: Chelate formation of trivalent aluminium and gallium with eriochrome cyanine RC

ECRC forms violet coloured chelates with aluminium(III) and gallium(III) with λmax 540 nm and 550 nm respectively at pH 4.5 and 3.5. The metal ligand ratio in both the cases has been found to be 1∶1. The chelates of aluminium and gallium are stable between pH 3.5 to 5.5 and pH 2.7 to 6.0 respectively. The apparent stability constants are 104.9 (pH 4.5) and 104.8 (pH 3.8) respectively for the aluminium and gallium chelates at 25°. The range of concentration for adherence toBeer's law, the effective range of photometric determination and the molar absorptivities are 0.27 to 0.97 p. p. m.; 0.18 to 0.97 p. p. m. and 3.20 · 104 for aluminium, and 0.093 to 2.52 p. p. m.; 0.46 to 2.52 p. p. m. and 2.20 ·104 for gallium respectively.

Chromogenic Behaviour of Eriochrome Cyanine R.C. in the Spectrophotometric Determination of Scandium, Yttrium and Lanthanum

Chromogenic Behaviour of Eriochrome Cyanine R.C. in the Spectrophotometric Determination of Scandium, Yttrium and Lanthanum

Eriochrome Cyanine R Method for Aluminum Determination

This article comments on the Shull & Guthan Journal AWWA article, “Rapid Modified Eriochrome Cyanine R Method for Determination of Aluminum in Water,” 59 :1456 (Nov. 1967).

SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF FLUORIDE IN PLUTONIUM

Abstract A simple and rapid spectrophotometric method for the determination of 10 to 70 μg of fluoride with Eriochrome Cyanine R in up to 10 mg of plutonium has been developed. In this method interference from the plutonium is eliminated by reduction of this element to the tripositive oxidation state with mercaptoacetic acid.

Rapid Modified Eriochrome Cyanine R Method for Determination of Aluminum in Water

This study developed a rapid, sensitive, accurate method for the determination of small amounts of aluminum in water. The method uses an eriochrome cyanine R dye that is a modification of Knight's method. The key factors in the modification are adjustment of the dye solutions and elimination of alkalinity, which, even in “trace” amounts, has a marked inhibitory effect. Other interferences are also eliminated, including iron and manganese with ascorbic acid, complex phosphates by boiling with acid, and fluoride, removed either by volatilization or by adding known concentrations of the ion to the aluminum solutions used in preparing calibration curves. Data are also presented to show that glass wool, absorbent cotton, and most filter papers remove nearly all the soluble aluminum from an aluminum solution. Only membrane filters can be used with confidence for this purpose. Finally, using the PSW modified method, it has been possible to demonstrate that aluminum concentrations of 0.05 mg/l or less can be expected in the filter effluent from a well‐operated water treatment plant.

Complex formation of iron (III) with eriochrome cyanine r

The complex formation of iron(III) with the trisodium salt of 5-[α-(3-carboxy-5-methyl-4-oxo-2,5-cyclohexadien-1-ylidene)-2-sulfobenzyl]-3-methylsalicylic acid (eriochrome cyanine R) was studied by spectrophotometry. The pure tetrabasic acid of the ligand (H 4ER) was prepared and used in the investigation. In the pH range 2.7–4.2 three complexes were detected: a ring-formed dimer Fe 2(ER) 2, Fe 2(ER) and Fe(ER) ; the absolute stability constants (at an ionic strength of 0.1 M and at room temperature (20 ± 3°)) were log k = 37.9, log k = 22.5 and log k = 17.9, respectively.

Spectrophotometric determination of aluminium with chrome azurol s

A comprehensive investigation of the spcctrophotometric determination of aluminium with chrome azurol S is described. No heating is required for colour formation, and the method is considerably more reproducible and selective than either the eriochrome cyanine R or aluminon methods. In the presence of suitable masking agents, only Be 2+, Zr 4+, and F-cause serious interference. A molar absorptivity of 21,500 at 567.5 mμ was found for the aluminium-chrome azurol S lake, with a relative standard deviation of ± 0.4% at the 20 μg Al level. Beer's law is obeyed from 0 to 1.2 mg Al/ml.

Spot Test for Beryllium Based on the Color Reaction with Eriochrome Cyanine R.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpot Test for Beryllium Based on the Color Reaction with Eriochrome Cyanine R.P. R. MohilnerCite this: Anal. Chem. 1963, 35, 8, 1103–1104Publication Date (Print):July 1, 1963Publication History Published online1 May 2002Published inissue 1 July 1963https://doi.org/10.1021/ac60201a062RIGHTS & PERMISSIONSArticle Views36Altmetric-Citations3LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (288 KB) Get e-Alerts Get e-Alerts

Estimation of Beryllium with Eriochrome Cyanine R Using the Ring Oven Technique.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of Beryllium with Eriochrome Cyanine R Using the Ring Oven Technique.P. W. West and P. R. MohilnerCite this: Anal. Chem. 1962, 34, 4, 558–560Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https://doi.org/10.1021/ac60184a035RIGHTS & PERMISSIONSArticle Views31Altmetric-Citations19LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (435 KB) Get e-Alerts Get e-Alerts

Rapid determination of beryllium. A paper-chromatographic method

A simple, rapid, and sensitive paper chromatographic method was developed for determining beryllium in beryllium-containing ores and allied materials. Eriochrome cyanine R is used as color-forming reagent, and interference is overcome by impregnating the paper with ethylenediaminetetraacetic acid. As little as 0.002 mu g of beryllium can be detected. (auth)

Volumetric Determination of Thorium in Uranium Alloys

Thorium is determined in uranium- thoriura, uranium--tungsten-thorium, and uranium -- titanium-thorium alloys by precipitation as the fluoride, using lanthanum as a carrier, followed by titration with EDTA. Eriochrome Cyanine RC is used as the indicator in the titration. ln 161 determinations of known solutions simulating the alloys with a thorium content of 0.1 to 3.0%, an average of 99.4% of the thorium was found. The relative standard deviation for individual values was 0.56% with no significant difference in the various synthetic solutions. (auth)

The determination of aluminium in soil, ash and plant materials using Eriochrome Cyanine R.A.

A method for the determination of microgram quantities of aluminium using Eriochrome Cyanine R. has been modified for use with plant and soil extracts. The effects of pH, time, and order of addition of the reagents are clarified, and the use of an iron blank in conjunction with sodium thioglycollate as an iron inhibitor is elaborated.

A rapid colorimetric method for the determi nation of aluminium in cu-al alloys

Aluminium is determined colorimetrically using Eriochrome cyanine. 'I'he application in this paper is to copper-aluminium alloys. The red colour obeys the Beer-Lambert law and the maximum absorption is at a wavelength of 550 mm

Spectrophotometric Determination of Beryllium with Eriochrome Cyanine R

Spectrophotometric Determination of Beryllium with Eriochrome Cyanine R