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Pregled bibliografske jedinice broj: 37312

The influence of data treatment on the interpretation of experimental results in voltammetry


Pižeta, Ivanka; Omanović, Dario; Branica, Marko
The influence of data treatment on the interpretation of experimental results in voltammetry // Analytica chimica acta, 401 (1999), 1-2; 163-172 (međunarodna recenzija, članak, znanstveni)


Naslov
The influence of data treatment on the interpretation of experimental results in voltammetry

Autori
Pižeta, Ivanka ; Omanović, Dario ; Branica, Marko

Izvornik
Analytica chimica acta (0003-2670) 401 (1999), 1-2; 163-172

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Voltammetry; data treatment; stability constants

Sažetak
In order to realize the advantages provided by recent improvements in data storage and treatment, enabled by computerized instrumentation, a procedure for data treatment in voltammetry is proposed. It is shown how steps of this procedure are related and may affect the final conclusions. Examples of noise elimination, baseline subtraction and peak potential determination are given. Concentration of the reactant in the simulated sample determined by the standard addition method can be highly influenced by the choice of baseline type. Depending on the peak determination procedure used and after the statistical tests provided, in a 4 mol l-1 ionic strength media, models with three (b1 = 15.8 ą 0.9, b2 = 54.8 ą 4.7, b3 = 171.5 ą 3.8) and four (b1 = 14.5 ą 0.4, b2 = 74.3 ą 2.5, b3 = 129.2 ą 3.2, b4 = 11.2 ą 1.0) labile lead (II) chlorocomplexes were obtained. Appreciating the more precise results, four stability constants are proposed. It is the consequence of a detection limit shift towards noticing the existence of lower percentage of the highest order complexes present in the solution, obtained by more sophisticated software algorithms. The other evidence of the existence of the fourth complex is the statistically highly approved existence of four complexes in a 6 mol l-1 ionic strength media (b1 = 36 ą 2, b2 = 232 ą 39, b3 = 1360 ą 105, b4 = 436 ą 51), which is in accordance with the influence of ionic strength on the stability constants.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
00981502

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • Chemical Abstracts