Microdetermination Of Copper Research Articles

Design and optimization of sensitive analytical spectrophotometric method for micro determination of copper(II) from e-waste by using of novel chromogenic extractant

In this article, a novel spectrophotometric reagent 1-(pyrimidine)-4, 4, 6-trimethyl-1,4-dihydropyrimidine-2-thiol [PTPT] has been synthesized for liquid–liquid extraction and spectrophotometric determination of copper(II). The as-synthesized ligand has been selectively forms stable complex with copper(II) in basic medium (pH 9.0), in presence of mild pyridine the extraction and color stability has found to be synergistically enhanced. The equilibrium time is 10 min for effective extraction of copper(II) from organic phase and absorbance of colored organic complex in carbon tetrachloride is measured spectrophotometrically at λmax 615 nm against reagent blank. The ternary complex of Cu(II)-PTPT-Py having molar ratio 1:2:2 (M:L:Py) showed green colored complex. The main factors influencing the achievement of synergistic extraction; i.e. pH, ligand concentration, type and volume of the dispersive organic solvents, equilibrium time, synergent concentration and foreign ions were investigated.The Beer’s law was obeyed in the concentration range 1–20 μg mL−1 of copper(II) and optimum concentration range is evaluated by Ringbom’s plot and it is found that 2.5–25 μg mL−1. In presence of pyridine, molar absorptivity and Sandell’s sensitivity of copper(II)-PTPT complex is 2.80 × 103 L mol−1 cm−1 and 0.226 μg cm−2, respectively and in absence of pyridine, molar absorptivity and Sandell’s sensitivity of copper(II)-PTPT complex is 1.35 × 103 L mol−1 cm−1 and 0.469 μg cm−2, respectively. The stoichiometry of the copper(II)-PTPT-pyridine complex was calculated by slope ratio method, mole ratio method and Job’s method of continuous variation and it has been found as 1:2:2. No significant effects of potentially interfering species i.e. cations and anions were observed. The optimized method was applied for the determination of copper(II) in binary, synthetic mixtures and successfully applied for determination of copper(II) from e-waste samples. The standard deviation (R.S.D.) is 0.11% for n = 5 repetition. The reliability of the developed method is confirmed by comparison of experimental results with atomic absorption spectrophotometer.

Aspirin in Food Samples for Separation and Micro Determination of Copper(II) Using Cloud Point Extraction/Solvation Method

Aspirin in Food Samples for Separation and Micro Determination of Copper(II) Using Cloud Point Extraction/Solvation Method

Solid Phase Spectrophotometric Microdetermination of Copper

Abstract A method for the determination of microgram per litre level of copper has been developed, based on Solid-Phase Spectrophotometry (SPS). Copper reacts with bichinconinic acid to form a 1:2 anionic reddish purple of Cu(I), which is fixed on a dextran-type anion-exchange resin. Resin phase absorbance is measured directly and allows for the determination of copper within the range of 1–20 μg. 1−1, using a 2,000 ml sample with an RSD of 1.7%. The method has been used in the determination of copper in natural waters.

Simultaneous microdetermination of copper(II), iron(II), and cadmium(II) by colorimetric method

Colorimetric methods have been developed for the simultaneous determination of iron(II) and copper(II), or iron(II) and cadmium(II), using 2,2'-dipyridyl-2-pyrimidyl hydrazone (DPPmH) at pH 9.0 in 40% ethanol-water medium. The concentrations of iron(II) and copper(II) in the mixture are determined from the equations: $$[Fe] \times 10^5 = 8.333 \times A_{580} - 0.024 \times A_{430}$$ and $$[Cu] \times 10^5 = 2.381 \times A_{480} - 0.015 \times A_{580} .$$ Similarly, iron(II) and cadmium(II) can be evaluated using the relations: $$[Fe] \times 10^5 = 8.33 \times A_{580} - 0.010 \times A_{440}$$ and $$[Cd] \times 10^5 = 2.083 \times A_{440} - 0.014 \times A_{580} .$$ The proposed methods are simple, rapid, and applicable at trace levels.

The micro determination of copper(II) with a solid-state copper-selective electrode

The standard addition and standard subtraction methods are discussed briefly. Both methods are applied to the determination of copper(II) in very small sample volumes. A microcell (25 μl) and a copper-selective micro-electrode are described for this purpose; a nanoliter burette was constructed for the addition of very small increments. The results are compared with those obtained in a 10-ml cell.

The microdetermination of copper in plasma protein fractions

Electrophoresis on cellulose acetate membranes and electrothermal atomization for atomic absorption spectrophotometry have been combined to allow the determination of copper in protein fractions separated from only 2 μl volumes of serum. The sensitivity of the method is 5.2 × 10 −11 g of copper for 1% absorption at 324.7 nm, and the precision of replicate analyses at the 1.7-ng level is 0.086 (Relative Standard deviation). The mean recovery of copper from the α 2-protein fraction of a serum sample was 94%. The method has been applied to a study of the changes in the copper content of the various protein fractions of sera from patients with Menkes' syndrome.

Microdetermination of copper in atmospheric particulates by a ring oven technique

Microdetermination of copper in atmospheric particulates by a ring oven technique

Trace Analysis of Metals by ESR. I. Microdetermination of Copper by Means of Solvent Extraction of Copper(II) Diethyldithiocarbamate

Abstract A new method was developed for the direct determination of copper using ESR. Cupric diethyldithiocarbamate complex dissolved in benzene shows a unique ESR spectrum. The bivalent complex in benzene gave a very strong ESR signal with intensity sensitive to 0.005 ppm of Cu(II)-ion. Thus the ESR signal can be utilized for the trace analysis of Cu(II)-ion. The ESR signal intensity was linear in the ranges 1.0–0.1 γ/ml and 0.1–0.01 γ/ml of Cu(II)-ion. Mg2+, Fe2+, Ba2+, Mn2+, Zn2+, Co2+, Pb2+, Ni2+, I−, Br−, and NO3− did not interfere with the determination, while Hg2+ and CN− did. Comparing this method with photometric determination, we see that a very low content of Cu(II)-ion can be determined with a very small amount of sample.

Microdetermination of Copper(II) by an exchange reaction on paper

Two methods are given for the determination of copper in very dilute solutions in water (1μg/ml). The sample is passed through filter paper impregnated with cadmium sulphide. Copper, lead, mercury, silver and bismuth ions at pH1.5–2 give an exchange reaction with the cadmium and are caught on the paper. When the paper is washed free from acid, dried, and treated with potassium cyanide, only the copper sulphide reacts. The excess of cyanide can be determined by its reaction with a filter impregnated with silver chloride, the size of the spot washed free from silver being a measure of the amount of cyanide. No other ions interfere with this method. If the other exchanging ions are absent, the copper can be estimated directly from the intensity of the copper sulphide stain on the cadmium sulphide paper, a standard series of stains being used for comparison. The range is 10–150μg of copper in 500–1000 ml the error being 3% for the cyanide method, and 7–8% for the standard series method.

Determination of copper, cobalt and nickel by circular thin-layer chromatography

A method for the microdetermination of copper, cobalt and nickel from a mixture containing 40 metal ions by circular thin-layer Chromatographic technique is described. The procedure is simple; the chromatoplate takes about 2 minutes for its development and other metal ions do not interfere with the determination. The recovery of copper, cobalt and nickel is better than 98%. The apparatus for the concentration of test solution before TLC analysis is also described.

Quantitative chemical analysis on paper: Micro-determination of copper and a mixture of copper and silver

A method has been suggested for the determination of small amounts of copper and of mixtures of copper and silver using filter paper impregnated with silver chloride and sodium carbonate. The method depends on competition between copper and silver ions to form complexes with cyanide added to the paper. The area of the spot produced by conversion of AgCl into Ag(CN)2− is measured by weight, and is inversely proportional to the amount of copper present, since the Cu(CN)43− complex is preferentially formed. The silver present is determined separately, and the amount of copper calculated.

Dalzin (diallyl-dithio-carbamido hydrazine) as a micro-reagent. I

Methods for the gravimetric micro-determination of copper, zinc and nickel separately and separations of Cu-Zn and Cu-Ni, using diallyl dithiocarbamido-hydrazine as reagent, are described. Separation is achieved by pH-control.

Omega chrome green BLL: A new analytical reagent

Omega Chrome Green BLL was used as a metal indicator for the direct complexometric titration of copper, lead, thorium and for the back titration of aluminium using thorium as a back titrant. It was also used as a colorimetric reagent for the microdetermination of copper and vanadium. A large number of anions and cations do not interfere in such a determination even if they are present in 10 folds the amount of copper or vanadium. Interference due to ferric iron is simply eliminated by the addition of few crystals of ascorbic acid to reduce it to the ferrous state.

Chelate formation of ammonium aurintricarboxylate with bivalent copper : Micro-determination of copper by the colorimetric method

The formation of a coloured copper II chelate by ammonium aurintricarboxylate with λmax at 540 mμ may be utilised in the colorimetric determination of cupric ions on a micro-scale. It has been found that, for satisfactory results, at least a twentyfold molar excess of the reagent should be added. The colour intensity can be measured by using a spectrophotometer or a photoelectric colorimeter with a suitable filter. The colour is stable at room temperature for sufficiently long periods, but the intensity decreases above 30°C. For the formation of a colour suitable for measurement, the pH should be within 5.3–6.7. The smallest amount of copper that can be detected by the reagent is 1.7 p.p m. Details have been worked out for the use of this reagent, and the interference by various foreign ions has been noted and tolerance limits determined spectrophotometrically.

Microdetermination of Copper in Biological Material

Microdetermination of Copper in Biological Material

Microdetermination of Copper in Biological Substances

IN the course of a series of investigations by F. Buscarons and E. Loriente1,2 on analytical applications of 3,3', 4,4'-diamine-3,3'-dimethoxy-biphenilo (o-dianisidin), these authors have shown that this substance in certain conditions possesses extreme sensitivity for cupric copper. We have used this reactant for colorimetric determinations of copper in the blood and in other biological substances.

Microdetermination of Copper with Polarograph

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrodetermination of Copper with PolarographChristopher CarruthersCite this: Ind. Eng. Chem. Anal. Ed. 1945, 17, 6, 398–399Publication Date (Print):June 1, 1945Publication History Published online1 May 2002Published inissue 1 June 1945https://doi.org/10.1021/i560142a020RIGHTS & PERMISSIONSArticle Views20Altmetric-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 (315 KB) Get e-Alerts

Micro-determination of copper in biological material

Micro-determination of copper in biological material

Spectrographic Microdetermination of Copper

Spectrographic Microdetermination of Copper