Određivanje koncentracije heksacianoferata primjenom tankoslojne ionsko-selektivne elektrode

undergraduate thesis

• Title (english): Determination of hexacianoferate by ion selective solid state electrode
• Author: Sara Krivačić
• Mentor: Stjepan Milardović (mentor)
• Committee member: Stjepan Milardović (predsjednik povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Inorganic Chemistry

Abstract

Ovaj rad bavi se modificiranjem te ispitivanjem plošnih all–solid ionsko–selektivnih elektroda. Elektrode su prireĊene tehnikom printanja na plastificiranoj podlozi pri ĉemu je kao tinta korišteno nanosrebro. Modifikacije su provedene u 1 mM i 2 mM otopini kalijeva heksacianoferata(II) podešene ionske jakosti pomoću 0,1 M otopine NaNO3, a ukljuĉuju kemijsko i elektrokemijsko oslojavanje metalne elektrode slabotopljivom soli srebrovog heksacianoferata(II). Kemijsko oslojavanje provedeno je namakanjem elektrode 72 sata u neutralnoj, odnosno 2 sata u kiseloj otopini K4[Fe(CN)6], dok je elektrokemijska modifikacija provedena cikliĉkom voltametrijom i potenciostatski. Tako pripremljene Ag|Ag4[Fe(CN)6] elektrode ispitivane su potenciometrijski u neprotoĉnim ćelijama pomoću niza standardnih otopina podešene ionske jakosti. Odziv na ione srebra odreĊivan je pomoću otopina AgNO3 u 0,1 M NaNO3, dok je odziv na heksacianoferate(II) mjeren u otopinama K4[Fe(CN)6] u 0,1 M NaNO3. Odzivi dobiveni za Ag+–ione su linearni u koncentracijskom rasponu od 10^–1 do 10^–7 M, a za heksacianoferat(II) u koncentracijskom rasponu od 10^–1 do 10^–4 M.

Abstract (english)

This work deals with modifying planar all–solid ion–selective electrodes and then using those in potentiometric measurements. Electrodes were manufactured by ink–jet printing technology on plastic substrate and then modified in 1 mM and 2 mM solutions of potassium hexacyanoferrate(II) prepared in 0,1 M solution of NaNO3. Modifications include chemical and electrochemical coating of metal electrode with a metal salt. One chemical modification was made by dipping the electrode in pH neutral K4[Fe(CN)6] solution for 72 hours, and the other one by dipping the electrode for 2 hours in acid solution of K4[Fe(CN)6]. Electrochemical modification of the electrode was done by cyclic voltammetry and at fixed potential. These Ag|Ag4[Fe(CN)6] electrodes were then used for potentiometric measurements in standard solutions of AgNO3 in 0,1 M NaNO3, for the determination of silver cations. Standard solutions of K4[Fe(CN)6] prepared in 0,1 M NaNO3 were used for measurement of hexacyanoferrates(II) concentrations. The linear response was obtained for silver ions in concentration range of 10^–1 – 10^–7 M and of 10^–1 – 10^–4 M for hexacyanoferrates(II).

• Keywords: senzori; srebro; plošna Ag|Ag4[Fe(CN)6] elektroda; potenciometrija
• Keywords (english): sensor; silver; planar Ag|Ag4[Fe(CN)6] electrode; potentiometry
• Language: croatian
• URN:NBN: urn:nbn:hr:149:054602
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-06-23 12:43:40