Rapid Potentiometric Method for Quantitative Determination of Copper in Alloys

1934 ◽  
Vol 6 (5) ◽  
pp. 316-318 ◽  
Author(s):  
Henry B. Hope ◽  
Madeline Ross
Keyword(s):  
Quantitative Determination ◽  
Potentiometric Method ◽  
Determination Of Copper

Quantitative Determination of Copper in Natural Rubber

1953 ◽  
Vol 26 (1) ◽  
pp. 251-256 ◽  
Author(s):  
Lewis T. Milliken
Keyword(s):  
Carbon Tetrachloride ◽  
Natural Rubber ◽  
Quantitative Determination ◽  
Oxidation Process ◽  
Aqueous Suspension ◽  
Wet Oxidation ◽  
Acid Extract ◽  
Organic Solution ◽  
Determination Of Copper

Abstract A procedure is recommended in which small amounts of copper in rubber can be measured quantitatively by determining the depth of color of a copper carbamate complex in a carbon tetrachloride solution. The complex is formed in an alkaline solution prepared from an acid extract of the rubber ashed at 550° C. This procedure yields results which are as reliable as those obtained by the more tedious and time-consuming procedures involving the wet-oxidation process which are at present recommended by standardizing organizations. The use of an organic solution rather than an aqueous suspension gives better reproducibility, permits easier use of a photometer, and reduces the interference due to iron by a factor of ten.

Serum Copper and Iron on a Single Sample

1958 ◽  
Vol 4 (1) ◽  
pp. 43-48 ◽  
Author(s):  
B Zak ◽  
N Ressler
Keyword(s):  
Quantitative Determination ◽  
Serum Sample ◽  
Organic Material ◽  
Serum Copper ◽  
Inorganic Salts ◽  
Organic Extract ◽  
Phenanthroline Complex ◽  
Extract Phase ◽  
Determination Of Copper

Abstract A procedure has been described for the quantitative determination of copper and iron in one serum sample. The sera are wet ashed to destroy organic material, leaving inorganic salts available in the residue for the subsequent spectrophotometric determination of iron as the ferrous-1,10-phenanthroline complex in the aqueous phase, and copper as the cuprous-2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline in an organic extract phase.

scholarly journals Determination of copper metals in leachate using potentiometric method by concentration cells

2018 ◽  
Vol 49 ◽  
pp. 02018
Author(s):  
Suheryanto ◽  
Zainal Fanani ◽  
Dewi Jayanti
Keyword(s):  
Selectivity Coefficient ◽  
Potentiometric Method ◽  
Cell Type ◽  
Copper Metal ◽  
Linear Region ◽  
Average Accuracy ◽  
Leachate Water ◽  
Concentration Cells ◽  
Determination Of Copper

The potentiometric method of cell type concentration is used to analyze the copper metal in leachate. This method is relatively good because it has a correlation coefficient of 0.9997 and linear region in the concentration range 1×10-5 1×10-3 mol L-1. The precision of this potentiometric method is low because the persent of RSD produced is 0.6% with an average accuracy 0f 95.35%. The detection limit (LoD) of the measurable method is 1.085×10-6 mol L-1 with LoQ 1.313×10-6 mol L-1. While the LoD instrument 1.217×10-6 mol L-1 and LoQ 1.560×10-6 mol L-1. In addition, this method is very selective with the selectivity coefficient of -3.7 and it has uncertainty of measurement 9.7×10-7 ± 1.282×10-6 to 9.12×10-5 ± 3.5×10-5. Potentiometric method of cell type of concentration has an optimum condition at pH5 and temperature 30˚C.The conditions of copper in leachate water renged from 9.253×10-5 to 8.696×10-4 mol L-1

Potentiometric Method for Determining Triphenyltin Compounds in Formulations: Collaborative Study

1978 ◽  
Vol 61 (6) ◽  
pp. 1504-1506
Author(s):  
René Litan ◽  
John Basters ◽  
Albertus Martijn ◽  
Thomas Van Der Molen ◽  
Piet Pasma ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Potentiometric Titration ◽  
Collaborative Study ◽  
Systematic Difference ◽  
Potentiometric Method ◽  
Sodium Tartrate ◽  
Extraction Step ◽  
Technical Material

Abstract Five laboratories collaboratively studied 2 procedures for the quantitative determination of triphenyltin compounds in technical material and in formulations. Both procedures include an extraction step and a potentiometric titration but differ in how byproducts are removed. The first is based on cleanup with sodium tartrate and in the second one alkaline alumina is used for purification. The performance, however, is different. The reproducibility and the repeatability are significantly better with the alumina method than with the tartrate method. The average (systematic) difference between the 2 methods was —2.3%. The method based on alkaline alumina cleanup has been adopted as an interim CIPAC method.

A Rapid Colorimetric Method for the Quantitative Determination of Copper Oxidase Activity (Ceruloplasmin)

1958 ◽  
Vol 4 (6) ◽  
pp. 519-523 ◽  
Author(s):  
O Boyd Houchin
Keyword(s):  
Quantitative Determination ◽  
Oxidase Activity ◽  
Clinical Laboratory ◽  
Colorimetric Method ◽  
Laboratory Equipment ◽  
Rapid Procedure ◽  
Copper Oxidase ◽  
Determination Of Copper

Abstract A rapid procedure for determining quantitatively copper oxidase activity of plasma or serum is described. It is calibrated against determined amounts of ceruloplasmin and can be adapted to usual clinical laboratory equipment for the quantitative determination of ceruloplasmin.

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