scholarly journals AMPEROMETRIC TITRATION OF PICROLONIC ACID AND INDIRECT VOLUMETRIC DETERMINATION OF CALCIUM BY PRECIPITATION AS PICROLONATE AND BACK TITRATION OF THE EXCESS OF PICROLONIC ACID WITH METHYLENE BLUE

1943 ◽  
Vol 148 (3) ◽  
pp. 711-718
Author(s):  
Gunther Cohn ◽  
I.M. Kolthoff
Keyword(s):  
Methylene Blue ◽  
Amperometric Titration ◽  
Back Titration ◽  
Volumetric Determination ◽  
Picrolonic Acid

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.

Volumetric determination of styphnates with methylene blue

The Analyst ◽  
1967 ◽  
Vol 92 (1095) ◽  
pp. 391 ◽  
Author(s):  
E. Kurz ◽  
G. Kober
Keyword(s):  
Methylene Blue ◽  
Volumetric Determination

scholarly journals Simultaneous Determination of Uric Acid and Xanthine Using a Poly(Methylene Blue) and Electrochemically Reduced Graphene Oxide Composite Film Modified Electrode

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Gen Liu ◽  
Wei Ma ◽  
Yan Luo ◽  
Deng-ming Sun ◽  
Shuang Shao
Keyword(s):  
Methylene Blue ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Composite Film ◽  
Simultaneous Determination ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

Poly(methylene blue) and electrochemically reduced graphene oxide composite film modified electrode (PMB-ERGO/GCE) was successfully fabricated by electropolymerization and was used for simultaneous determination of uric acid (UA) and xanthine (Xa). Based on the excellent electrocatalytic activity of PMB-ERGO/GCE, the electrochemical behaviors of UA and Xa were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV). Two anodic sensitive peaks at 0.630 V (versus Ag/AgCl) for UA and 1.006 V (versus Ag/AgCl) for Xa were given by CV in pH 3.0 phosphate buffer. The calibration curves for UA and Xa were obtained in the range of 8.00 × 10−8~4.00 × 10−4 M and 1.00 × 10−7~4.00 × 10−4 M, respectively, by SWV. The detection limits for UA and Xa were3.00×10-8 M and5.00×10-8 M, respectively. Finally, the proposed method was applied to simultaneously determine UA and Xa in human urine with good selectivity and high sensitivity.

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