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A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid

Poređenje različitih metoda za uklanjanje rastvorenog kiseonika - primena pri elektrohemijskom određivanju imidakloprida

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2015
1493.pdf (327.2Kb)
Authors
Đurović, Ana
Stojanović, Zorica
Kravić, Snežana
Suturović, Zvonimir
Brezo, Tanja
Grahovac, Nada
Milanović, Spasenija D.
article (publishedVersion)
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Abstract
This study compares different methods for the removal of oxygen from the solution prior to the chronopotentiometric determination of the insecticide imidacloprid on glassy carbon electrode. The research included the application of the chemical method involving addition of sulfite ion, and the physical method of purging the sample with nitrogen stream, as well as their combination. By comparing analytical signals of imidacloprid, chemical method showed almost the same efficiency as conventional physical method, while the best reproducibility was achieved by applying chemical method with addition of the saturated sodium sulfite solution. The method is very simple and can be applied for deoxygenation of the solution prior to the chronopotentiometric analysis. The application of the chemical deoxygenation significantly shortened duration of the chronopotentiometric analysis of imidacloprid from approximately 15 min to 1 min.
U ovoj studiji poređene su različite metode za uklanjanje rastvorenog kiseonika iz rastvora pre hronopotenciometrijskog određivanja insekticida imidakloprida na elektrodi od staklastog ugljenika. Istraživanje je obuhvatalo primenu hemijske metode dodatkom sulfitnog jona i fizičke metode provođenje struje azota kroz uzorak u trajanju od 5, 10 i 15 min, kao i njihovu kombinaciju. Poređenjem analitičkih signala imidakloprida, hemijska metoda pokazala je skoro istu efikasnost kao i konvencionalna fizička metoda, dok je najbolja reproduktivnost ostvarena primenom hemijske metode uz dodatak 0,8 cm3 zasićenog rastvora natrijum sulfita. Metoda je veoma jednostavna i može se primeniti za uklanjanje kiseonika iz rastvora pre izvođenja hronopotenciometrijske analize. Primenom hemijske deoksigenacije značajno se skraćuje trajanje hronopotenciometrijske analize imidakloprida sa 15 min na 1 min.
Keywords:
imidacloprid / sulfite ion / chemical deoxygenation / imidakloprid / sulfitni jon / hemijska deoksigenacija
Source:
Acta Periodica Technologica, 2015, 46, 149-155
Publisher:
  • Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad
Funding / projects:
  • info:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/46009/RS// (RS-46009)

DOI: 10.2298/APT1546149D

ISSN: 1450-7188

Scopus: 2-s2.0-84949184056
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URI
http://fiver.ifvcns.rs/handle/123456789/1496
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