Kapacitet kompleksiranja bakra u atmosferskom taloženju na području nacionalnog parka Brijuni

master's thesis

• Title (english): Copper complexing capacity in atmospheric deposition in the area of Brijuni national park
• Author: Valentina Poplašen
• Mentor: Slađana Strmečki Kos (mentor)
• Committee member: Nives Galić (predsjednik povjerenstva)
• Committee member: Željka Soldin (član povjerenstva)
• Committee member: Davor Kovačević (član povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Bioraspoloživost Cu2+-iona u prirodnim vodenim uzorcima je određena njihovom kemijskom
specijacijom. U radu su definirani mjerni uvjeti (potencijal desorpcije −1,4 V i dodatak 1 mg
dm−3 surfaktanta T-X-100) koji su omogućili smanjenje interferencije atmosferskih molekula
poput fulvične kiseline i HULIS-C na radnoj elektrodi. Nakon transformacije rezultata
kompleksometrijskih titracija u matematičke metode u ProMCC programu određeni su
parametri kapaciteta kompleksiranja Cu2+-iona: ukupna koncentracija organskih molekula
(cL) koje vežu Cu2+-ione u slabije inertne komplekse (log Ku < 11,4) u uzorcima kiše (od
(51,5 ± 5,65) do (306 ± 5,65)x10−9 mol dm−3
), ukupne taložne tvari (od (27,7 ± 2,77) do (263
± 5,65) x10−9 mol dm−3
), i u vodotopljivoj frakciji atmosferskih lebdećih čestica (od (69,6 ±
3,3) do (392 ± 4,4)x10−9 mol dm−3
) s područja NP Brijuni od 4.10. do 3.11.2021. U uzorcima
kiše i UTT su svi Cu2+-ioni kompleksirani, dok u nekim uzorcima atmosferskih čestica postoji
nekompleksirana i potencijalno biodostupna koncentracija Cu2+-iona.

Abstract (english)

The bioavailability of Cu2+-ions in natural waters is regulated by their chemical speciation. In
this work, the measurement conditions (desorption potential −1,4 V, addition of 1 mg dm−3 TX-100) were chosen to reduce the interference of atmospheric molecules such as fulvic acid
and HULIS-C on the working electrode. After converting the results of complexometric
titrations into mathematical models in the ProMCC program, the copper complexation
capacity parameters were determined: total concentration of organic molecules (cL) binding
Cu2+-ions in weaker inert complexes (log Ku < 11,4) in rain ((51,5 ± 5,65) to (306 ±
5,65)x10−9 mol dm−3
), in total atmospheric deposition ((27,7 ± 2,77) to (263 ± 5,65) x10−9
mol dm−3
), and in the water-soluble fraction of particulate matter ((69,6 ± 3,3) to (392 ± 4,4)
x10−9 mol dm−3
) from the NP Brijuni in October-November 2021. In the samples of rain and
UTT, Cu2+-ions are complexed, while in some particulate matter there is a non-complexed
and potentially bioavailable Cu2+-ions concentration.

• Keywords: atmosfersko taloženje; elektrokemijske metode; kapacitet kompleksiranja; površinski aktivna tvar
• Keywords (english): atmospheric deposition; complexing capacity; electrochemical methods; surface active substances
• Language: croatian
• URN:NBN: urn:nbn:hr:217:750160
• Project: Number: IP-2018-01-3105; Title: Biokemijski odgovori površinskog sloja oligotrofnog područja Jadranskog mora na atmosfersko taloženje; Acronym: BiREADI; Leader: Sanja Frka Milosavljević; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2024-09-28
• Created on: 2022-10-11 14:16:40