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Title:Determination of penicillamine by batch and flow-injection potentiometry with AgI-based sensor
Authors:ID Radić, Njegomir (Author)
ID Komljenović, Josipa (Author)
ID Dobčnik, Danilo (Author)
Files:.pdf Croatica_Chemica_Acta_2000_Radic,_Komljenovic,_Dobcnik_Determination_of_penicillamine_by_batch_and_flow-injection_potentiometry_with_AgI.pdf (196,90 KB)
MD5: 4031B198291A8172DFD2F8278C54A9BB
PID: 20.500.12556/dkum/2b6b7b77-d9c0-46c5-95f2-5819e67632b8
 
URL http://hrcak.srce.hr/132094
 
Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Potentiometric determination of penicillamine (pen) is described based on a batch experiment and flow-injection analysis (FIA) using a chemical sensor with AgI-based membrane. The membrane was prepared by pressing silver salts (AgI, Ag2S) and powdered Teflon. This membrane was incorporated in a multipurpose electrode body for batch measurements, and in a tabular flow-through sensor body for FIA measurements. For batch measurements, the equilibrium potentials recorded with continuous addition of standard penicillamine solution were considered in relation to lg(cpen/molL−1). Linear response with slope of 60 mV was obtained in the concentration range from 2.5 x 105 mol L1 to 1.8 x 10−2mol L−1. In using the tubular sensor with a membrane of the same coposition for FIA measurements, the linear response with slope of 59 mV was recorded in the concentration range from 1 x 104 mol L1 to 1 x 10−1 mol L−1. The response of the applied chemical sensor to penicillamine (designated also as RSH) is explained by the formation of sparingly soluble RSAg in the reaction solution and/or the exposed surface of the sensor. The solubility product Ks(RSAg) was determined using experimental values recorded both by batch measurements and by the continuous-flow experiment. The mean value obtained by different measurements and using a membrane of the same composition is Ks(RSAg) = (1.4+-0.1) x 10−20 mol L−2).
Keywords:analytical chemistry, batch potentiometry, flow-injection analysis, membrane electrode, tubular sensors, penicillamine
Publication status:Published
Publication version:Version of Record
Year of publishing:2000
Number of pages:str. 265-277
Numbering:Letn. 73, št. 1
PID:20.500.12556/DKUM-66656 New window
ISSN:0011-1643
UDC:543.257
ISSN on article:0011-1643
COBISS.SI-ID:5204502 New window
NUK URN:URN:SI:UM:DK:YTPWV4B3
Publication date in DKUM:05.07.2017
Views:1316
Downloads:90
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
RADIĆ, Njegomir, KOMLJENOVIĆ, Josipa and DOBČNIK, Danilo, 2000, Determination of penicillamine by batch and flow-injection potentiometry with AgI-based sensor. Croatica Chemica Acta [online]. 2000. Vol. 73, no. 1, p. 265–277. [Accessed 22 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=66656
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Record is a part of a journal

Title:Croatica Chemica Acta
Shortened title:Croat. Chem. Acta
Publisher:Hrvatsko kemijsko društvo
ISSN:0011-1643
COBISS.SI-ID:22807 New window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:05.07.2017

Secondary language

Language:Croatian
Title:Određivanje penicilamina primjenom klasične i protočno-injekcijske potenciometrije
Abstract:Opisano je potenciometrijsko određivanje penicilamina (pen) primjenom klasične potenciometrije i protočno-injekcijske analize (FIA) uporabom kemijskog senzora s membranom na osnovi AgI. Membrana, pripravljena prešanjem soli srebra (AgI, Ag2S) i Teflona u prahu, ugrađena je u višenamjensko tijelo elektrode za klasična potenciometrijska mjerenja, odnosno u tijelo protočnoga cjevastog detektora za FIA. Ravnotežni potencijali, zabilježeni pri uzastopnim dodatcima standardne otopine penicilamina kod klasične potenciometrije, stavljeni su u odnos prema lg(cpen/molL−1). Linearni odziv s nagibom od 60 mV dobiven je u koncentracijskom području od 2.5 x 105 mol L1 do 1.8 x 10−2mol L−1. Pri uporabi cjevastog senzora s membranom istog sastava kod FIA-mjerenja zabilježen je linearni odziv s nagibom 59 mV u koncentracijskom području od 1 x 104 mol L1 do 1 x 10−1 mol L−1. Odziv korištenog kemijskog senzora prema penicilaminu (označen i kao RSH) protumačen je nastajanjem težko topljivog RSAg u reakcijskoj otopini ili/i na izloženoj površini senzora. Na temelju eksperimentalnih vrijednosti zabilježenih pri mjerenjima primjenom klasične potenciometrije i eksperimenta s kontinuiranim protokom kroz cjevasti senzor određen je produkt topljivosti Ks(RSAg). Dobivena srednja vrijednost različitih mjerenja s membranom istog sastava jest: Ks(RSAg) = (1.4+-0.1) x 10−20 mol L−2).
Keywords:analizna kemija, direktna potenciometrija, pretočno injekcijska analiza, membranske elektrode, cevni senzorji, penicilamin


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