Sequential injection system with in-line solid phase extraction and soil mini-column for determination of zinc and copper in soil leachates

Justyna Paluch; Raquel B R Mesquita; Víctor Cerdà; Joanna Kozak; Marcin Wieczorek; António O S S Rangel

doi:10.1016/j.talanta.2018.03.091

Sequential injection system with in-line solid phase extraction and soil mini-column for determination of zinc and copper in soil leachates

Talanta. 2018 Aug 1:185:316-323. doi: 10.1016/j.talanta.2018.03.091. Epub 2018 Mar 30.

Authors

Justyna Paluch¹, Raquel B R Mesquita², Víctor Cerdà³, Joanna Kozak⁴, Marcin Wieczorek⁴, António O S S Rangel⁵

Affiliations

¹ Department of Analytical Chemistry, Faculty of Chemistry, Jagiellonian University in Kraków, ul. Gronostajowa 2, 30-387 Kraków, Poland; Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, 172, 4200-374 Porto, Portugal.
² Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, 172, 4200-374 Porto, Portugal. Electronic address: rmesquita@porto.ucp.pt.
³ Group of Analytical Chemistry, Automation and Environment, Department of Chemistry, University of the Balearic Islands, E-07122 Palma de Mallorca, Spain.
⁴ Department of Analytical Chemistry, Faculty of Chemistry, Jagiellonian University in Kraków, ul. Gronostajowa 2, 30-387 Kraków, Poland.
⁵ Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, 172, 4200-374 Porto, Portugal.

PMID: 29759206
DOI: 10.1016/j.talanta.2018.03.091

Abstract

A sequential injection (SI) system equipped with in-line solid phase extraction column and in-line soil mini-column is proposed for determination of zinc and copper in soil leachates. The spectrophotometric determination (560 nm) is based on the reaction of both analytes with 1-(2-Pyridylazo)-2-naphthol (PAN). Zinc is determined after retaining copper on a cationic resin (Chelex100) whereas copper is determined from the difference of the absorbance measured for both analytes, introduced into the system with the use of a different channel, and zinc absorbance. The influence of several potential interferences was studied. Using the developed method, zinc and copper were determined within the concentration ranges of 0.005-0.300 and 0.011-0.200 mg L^-1, and with a relative standard deviation lower than 6.0% and 5.1%, respectively. The detection limits are 1.4 and 3.0 µg/L for determination of zinc and copper, respectively. The developed SI method was verified by the determination of both analytes in synthetic and certified reference materials of water samples, and applied to the determination of the analytes in rain water and soil leachates from laboratory scale soil core column and in-line soil mini-column.

Keywords: Copper; Mini soil column; Sequential injection analysis; Soil leachates; Zinc.