Differential-pulse polarographic determination of iron in acids, waters, fruit juices and wines

The Analyst ◽  
1994 ◽  
Vol 119 (7) ◽  
pp. 1571-1574 ◽  
Author(s):  
M. E. Vázquez Diaz ◽  
J. C. Jiménez Sánchez ◽  
M. Callejón Mochón ◽  
A. Guiraúm Pérez
Keyword(s):  
Differential Pulse ◽  
Fruit Juices ◽  
Polarographic Determination

Polarographic determination of vitamin C after derivatization with o-phenylenediamine

2010 ◽  
Vol 75 (7) ◽  
pp. 731-741 ◽  
Author(s):  
José António Rodrigues ◽  
Inês Maria Valente ◽  
Luís Moreira Gonçalves ◽  
João Grosso Pacheco ◽  
Aquiles Araújo Barros
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Hydrolytic Degradation ◽  
Dehydroascorbic Acid ◽  
Differential Pulse ◽  
Fruit Juices ◽  
Polarographic Determination ◽  
Initial Oxidation ◽  
The Common

A differential pulse polarographic (DPP) method has been developed for the determination of ascorbic acid (AA) and dehydroascorbic acid (DHA), the two main forms of Vitamin C. The method consists of the DPP analysis of a quinoxaline obtained by the derivatization of DHA with o-phenylenediamine. Results using the proposed method correlated well with those obtained by two reference methodologies: the common iodometric method and a published chromatographic methodology. It was also used in the study of Vitamin C degradation in fruit juices, showing that it involves an initial oxidation of AA to DHA, followed by hydrolytic degradation of the latter.

DIFFERENTIAL PULSE POLAROGRAPHIC DETERMINATION OF FORMALDEHYDE IN STORED NOXYTHIOLIN SOLUTIONS

1985 ◽  
Vol 10 (2) ◽  
pp. 177-183
Author(s):  
A. D. Woolfson ◽  
D. F. McCafferty ◽  
S. P. Gorman ◽  
Lesley Anderson
Keyword(s):  
Differential Pulse ◽  
Polarographic Determination

scholarly journals DIFFERENTIAL PULSE POLAROGRAPHIC DETERMINATION OF ARSENIC IN BITUMINOUS COAL

1998 ◽  
Vol 6 (7) ◽  
pp. 27-32
Author(s):  
M. Nogami Eurica ◽  
M. Dalmeida Gracinda ◽  
Jorge Nozaki
Keyword(s):  
Coal Sample ◽  
Bituminous Coal ◽  
Supporting Electrolyte ◽  
Arsenic Concentration ◽  
Differential Pulse ◽  
Polarographic Determination ◽  
Differential Pulse Polarography ◽  
Acidic Media ◽  
Pulse Polarography

Differential pulse polarography was employed for the determination of arsenic in bituminous coal from Figueiras, Parana, Brazil. The dried coal sample was crushed to -100 mesh, ashed, and treated with reducing reagents in acidic media. The arsine generated was collected and selectively oxidized to Al +3 using an absorbing solution of 0.1 mol.L -1 [tris(hydroxymethyl) aminomethane] ( TRIS) and 0. 002 mol.L -1 silver nitrate. A solution of TRIS and hydrochloric acid, pH -1, was used as supporting electrolyte for differential pulse polarographic determination of Al+3 in the concentration range 0.05 -0.60 μglmL. The average arsenic concentration found was 69.0 ± 2.6 mg.kg -1 and was in agreement with the spectrophotometric method using silver-diethyldithiocarbamate-pyridine.

Differential pulse polarographic determination of dicrotophos, crotoxyphos and chlorfenvinphos in grains and soils

Talanta ◽  
1997 ◽  
Vol 44 (10) ◽  
pp. 1859-1863 ◽  
Author(s):  
N SREEDHAR ◽  
P RAJENDRAKUMARREDDY ◽  
G SUBBAREDDY ◽  
S REDDY
Keyword(s):  
Differential Pulse ◽  
Polarographic Determination
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