Naslov
Adaption of a solid phase extraction method for copper (I) determination in marine waters and estuaries

Autori
Crmarić, Dora ; Bura-Nakić, Elvira

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
22nd European Meeting on Environmental Chemistry (EMEC22) : Book of Abstracts / Bavcon Kralj, Mojca ; Trebše, Polonca ; Prosenc, Franja ; Šunta, Urška ; Čižmek, Lara - Ljubljana : University of Ljubljana, Faculty of Health Sciences, 2022, 133-133

ISBN
978-961-297-035-2

Skup
22nd European Meeting on Environmental Chemistry (EMEC22)

Mjesto i datum
Ljubljana, Slovenija, 05.12.2022. - 08.12.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
copper ; speciation ; solid phase extraction ; bathocuproine ; anodic stripping voltammetry

Sažetak
Copper (Cu) occurs in nanomolar concentrations in seawater and is an essential micronutrient to the most marine organisms, but its free ion is toxic to marine organisms at concentrations as low as 10-12 M. Copper in oxic environments such as oceans is primarily present as Cu (II), leading to speciation models assuming only Cu (II) as significant Cu state. Only few studies reported detectable amounts of Cu (I) in water, with Cu (I) ratio ranging from 5-10% of total dissolved copper in oceans and up to 80% of total dissolved copper in estuaries. Marine organisms are producing Cu binding ligands as defence mechanism against free Cu toxicity, which are likely reducing Cu (II) to Cu (I). Since it is predicted that free Cu concentration in ocean will rise by 50 % by the end of century, better understanding of copper speciation is crucial to asses its negative effects. In this work we will present adaption of solid phase extraction method for Cu (I) determination in seawater. Cu (I) is retained on column as bathocuproine (BCP) complex, while Cu (II) is complexed with ethilendiamine (EDTA) and it is not retained on column. Cu (I) is eluated with acidic methanol, irradiated under UV lamp and mixed with concentrated HNO3, HCl and H2O2 in order to destruct Cu (I)- BCP complex. Cu concentrations are measured in both Cu (II) and Cu (I) fractions, as well as in seawater samples before column separation, using anodic stripping voltammetry (ASV) with hanging drop mercury electrode (HDME).

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA