Method For Determination Of Copper Research Articles

Extractive-spectrophotometric determination of traces of copper(II) with 4-( p-nitrophenylazo)-2-amino-3-pyridinol

A new extractive-spectrophotometric method for determination of copper(II) with 4-( p-nitrophenylazo)-2-amino-3-pyridinol is proposed. The established stoichiometry and extraction constant are 2:1 ligand:metal and −1.55, respectively. The molar absorptivity of the complex is 5.19 × 10 4 liters mol −1 cm −1 at 560 nm and Sandell's sensitivity is 1.2 ng cm −2. The best conditions for determination and effect of other ions are studied. The method proposed is applied in the determination of copper in whisky, liver of fish, and seawater.

Selective method for the complexometric determination of copper in alloys and ores

A complexometric method for the determination of copper(II) in the presence of other metal ions is described. The method is based on the selective complexing ability of mercaptosuccinic acid towards Cu(II). Copper, present in a given sample solution, is initially complexed by the addition of EDTA solution and the excess is titrated against zinc solution. A known excess of mercaptosuccinic acid is then added to release EDTA from the Cu(II)-EDTA complex, which is subsequently titrated against zinc solution. The amount of EDTA replaced from the complex is equivalent to the amount of Cu(II) in the solution. Various metal ions such as Pb(II), Ni(II), Co(II), Cd(II), Fe(III), Al(III), Ti(IV), Th(IV) and rare earths and anions such as Cl–, NO3– SO42–, acetate, tartrate and F– were found not to interfere. Interference from ions such as Sn(IV), Zr(IV), Bi(III), Hg(II) and Pd(II) can be overcome by the use of suitable masking agents. The method has been successfully applied to the analysis of various alloys and ores.

A new catalytic method for determination of copper in blood serum

A sensitive, accurate and fast catalytic method is proposed for determination of copper in blood serum, based on a new catalytic reaction—oxidation of 1,3,5-trihydroxybenzene by H 2O 2. The method permits copper to be determined down to 1 ng/ml in a sample of 0.10 ml of blood serum with a sufficient accuracy and precision even in sera with abnormally low copper assay. Twenty samples can be analysed per hour by a very simple procedure without separation of the metal to be determined.

Catalytic Decomposition of the Excess Reagent in the Spectrophotometric Determination of Copper(II) with o,o′-Dihydroxyazo Compounds

Abstract A simple and sensitive spectrophotometric method for determination of copper(II) is described. It is based on the reaction of copper(II) with Hydroxynaphthol Blue in the weakly alkaline medium and the decomposition of the unconsumed reagent which shows an intense absorption at the wavelength, 555 nm, of the maximum absorbance of the copper(II) complex. Beer’s law is obeyed over the range 0.13–1.27 ppm copper with the molar absorption coefficient of ε555=3.01×104 dm3 mol−1 cm−1 (Sandell’s sensitivity 2.11×10−3 μg/cm2). A fairly large number of common ions except for nickel(II) do not interfere.

Simple and sensitive catalytic method for determination of copper in blood serum.

A new catalytic method is proposed for determination of copper in blood serum, based on the oxidation of sulphanilic acid with H2O2, catalysed by copper(II). Because of its high sensitivity the method requires a serum sample of only 0.10 ml. Using the fixed-time method reduces the procedure to that of an ordinary photometric determination. The method shows reasonable precision and accuracy and is suitable for routine serial analyses in clinical practice.

Amperometric determination of copper with resacetophenone-phenylhydrazone

An amperometric method for determination of copper (II) with resacetophenone-phenylhydrazone is described. The method is useful to determine the metal in amounts ranging from 1·0–16·0 mg with an accuracy of ±1 per cent. Ten-fold excess of zinc, cadmium and nickel did not interfere. Iron which interefered both polarographically and chemically was complexed with sodium fluoride and the determination was successfully carried out. The method was applied for the determination of the metal in german silver.

Comparison of Two Colorimetric Methods for Determination of Copper in Mineral Oils.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of Two Colorimetric Methods for Determination of Copper in Mineral Oils.J. M. Howard and H. O. SpauschusCite this: Anal. Chem. 1963, 35, 8, 1016–1017Publication Date (Print):July 1, 1963Publication History Published online1 May 2002Published inissue 1 July 1963https://doi.org/10.1021/ac60201a030RIGHTS & PERMISSIONSArticle Views74Altmetric-Citations6LEARN 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 (278 KB) Get e-Alerts Get e-Alerts

Amperometric determination of copper with mandelamidoxime

A rapid method for the amperometric determination of copper with mandelamidoxime is described. About 0.5–8.0 mg copper(II) at a concentration of ca. 0.8–3.2 mM can be determined with accuracy (error less than ± 1%) in an ammonium chloride — ammonia buffer medium using a simple manual apparatus with a microammeter (0–50 μA) of large scale for measuring the current. Direct titration of copper is possible only in the presence of cadmium while in the presence of all other commonly associated elements preliminary separation is necessary.

Rapid Method for Determination of Copper in Converter Matte and Slag. I

Rapid Method for Determination of Copper in Converter Matte and Slag. I

Rapid Method for Determination of Copper in Steel Especially Suitable for Foundry Control

Rapid Method for Determination of Copper in Steel Especially Suitable for Foundry Control

Methods for Determination of Copper and Zinc in Soil

Methods for Determination of Copper and Zinc in Soil

31. The Determination of Copper and Iron in Dairy Products

1. Two colorimetric methods for determination of copper have been described, viz. the xanthate and the sodium diethyl-dithio-carbamate. Both methods have given satisfactory results but the carbamate method has proved to be more sensitive and less liable to error from possible contamination than the xanthate method.2. The colorimetric determination of iron by the modification of the ferric thiocyanate method has been proved to give a very high degree of accuracy and excellent results have been obtained.3. A method of wet ashing has been described whereby organic matter is oxidised by the use of concentrated sulphuric acid and sodium nitrate and copper and iron extracted from the fat.4. A number of results are given showing the amount of copper and iron contamination that the cream is subjected to during the course of butter manufacture, and the distribution of copper and iron in the cream, butter and buttermilk.