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Determination of Cu(II) in Beer by Derivative Potentiometric Stripping Analysis
Author(s) -
Mayer Heidi,
Marconi Ombretta,
Floridi Simona,
Montanari Luigi,
Fantozzi Paolo
Publication year - 2003
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.2003.tb00606.x
Subject(s) - chemistry , hydrochloric acid , detection limit , reagent , atomic absorption spectroscopy , potentiometric titration , chloride , chromatography , standard addition , electroanalytical method , stripping (fiber) , potassium , metal ions in aqueous solution , mercury (programming language) , nuclear chemistry , metal , ion , inorganic chemistry , materials science , organic chemistry , composite material , physics , quantum mechanics , computer science , programming language
Derivative Potentiometric‐Stripping Analysis (dPSA) is described as an inexpensive and rapid method for the determination of Cu(II) in beer. Beer samples were analysed directly after degassing and addition of the analytical reagents (hydrochloric acid, mercury(II) chloride, and potassium metabisulfite). It was not necessary to digest the sample. During dPSA the metal ions are deposited on a glassy carbon‐working electrode and then stripped by a suitable oxidant. Quantitative analysis was carried out by the method of standard additions. The recovery of the method was tested by adding 50 μg L −1 , 75 μg L −1 and 100 μg L −1 of Cu(II) (as Cu(II) chloride solution) to the beer. The mean recoveries of Cu(II) ranged from 95 ± 5% to 98 ± 2%. The reproducibility was evaluated by three repetitive analyses for each sample and the standard deviation ranged from 0.6 μg L −1 to 5.5 μg L −1 . The detection limit was 0.8 μg L −1 . The Cu(II) concentration determined in seven beer samples ranged from 28 μg L −1 to 48 μg L −1 and the results obtained were not significantly different from those obtained by atomic absorption spectrophotometry (AAS).