Volumetric determination of cobalt in Co-Sm-Fe alloys using a silver ion selective electrode in aqueous dimethylformamide and in water

1979 ◽  
Vol 44 (6) ◽  
pp. 1742-1746 ◽  
Author(s):  
Adam Košturiak ◽  
Dagmar Kalavská
Keyword(s):  
Aqueous Solution ◽  
Silver Nitrate ◽  
Silver Ion ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Back Titration ◽  
Volumetric Determination ◽  
Excess Sodium ◽  
Fe Alloys

A procedure is suggested for direct volumetric determination of cobalt with a sodium diethyldithiocarbaminate titrant solution in the medium of 80% dimethylformamide, using indication with a silver ion selective electrode. The procedure was applied to the cobalt determination in Co-Sm-Fe alloys. The method was adapted for the determination of cobalt in aqueous solution by back titration of excess sodium diethyldithiocarbaminate with a silver nitrate titrant solution or with generated Ag(I), using the same indication or biamperometric indication.

Titrimetric determination of cobalt, nickel and lanthanoids in alloys for novel permanent magnets using ion selective electrodes

1981 ◽  
Vol 46 (4) ◽  
pp. 982-986
Author(s):  
Dagmar Kalavská ◽  
Adam Košturiak ◽  
Svetozár Kalavský
Keyword(s):  
Permanent Magnets ◽  
Copper Ion ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Fluoride Ions ◽  
Cobalt Nickel ◽  
Back Titration ◽  
Titrimetric Determination ◽  
Fluoride Ion Selective Electrode

A procedure of chelatometric determination of cobalt, nickel and lanthanoids based on back titration with Cu(II) ions using copper ion selective electrode has been developed and applied to alloys for novel type permanent magnets. In addition, a method has been worked out for direct titrimetric determination of lanthanoids with solution of fluoride ions in 75% ethanol using fluoride ion selective electrode.

Titration of sulphates and lead using lead ion selective electrode

1981 ◽  
Vol 46 (2) ◽  
pp. 368-376 ◽  
Author(s):  
Josef Veselý
Keyword(s):  
Ionic Strength ◽  
Electrode Surface ◽  
Salt Content ◽  
Ion Selective Electrode ◽  
Lead Ion ◽  
Selective Electrode ◽  
Limit Of Determination ◽  
Total Salt Content ◽  
Automatic Titration

Titration of sulphates with lead perchlorate employing lead ion selective electrode indication was studied using additions of various organic solvents at different pH' and ionic strength values. As the optimum emerged systems with 60-70% 1,4-dioxane, pH' 5.3-5.6. After dehydration with sodium hydroxide, dioxane must be freed from the electrode surface-oxidizing impurities by their reduction with sodium metal and subsequent distillation. The method was applied to determination of sulphates in mountain spring waters. Units of ppm can be determined; the limit of determination, however, depends considerably on the content of dioxane, total salt content in the sample, and speed of the semi-automatic titration. Lead can be determined with EDTA in concentrations down to c(Pb2+) = 5 . 10-6 mol l-1.

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