University of Oulu

Johanna Havia, Matti Niemelä, Paavo Perämäki, Nano-TiO2 catalyzed UV-LED sample pretreatment method for decomposition of humic substances in natural water samples, Microchemical Journal, Volume 133, 2017, Pages 645-649, ISSN 0026-265X,

Nano-TiO₂ catalyzed UV-LED sample pretreatment method for decomposition of humic substances in natural water samples

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Author: Havia, Johanna1; Niemelä, Matti1; Perämäki, Paavo1
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, FI-90014 University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2019-11-22


A photocatalytic digestion device consisting of an ultraviolet light emitting diode (UV-LED) and a nano-TiO2 coated catalyst rod was designed and used for the decomposition of humic substances in natural water samples prior to inorganic elemental analysis. The aim was to develop a green sample pretreatment method by utilizing energy efficient and environmental friendly UV-LED technology. The effects of different experimental variables including pH, UV-LED irradiation time, and hydrogen peroxide concentration were studied using a statistical experimental design. Dissolved organic carbon (DOC) removal was studied as the response. Dissolved organic carbon can interfere in some analytical measurements (for example in electrochemical analysis methods) and after digestion, the possible interfering effects are minimized. The recoveries for some spiked elements (As, Bi, Cd, Co, Cu, Ge, Ni, Pb, Sb, Se and Tl) were studied. It was found that in optimal DOC removal conditions, the recoveries for cadmium, cobalt, nickel and selenium were good. However, lower recoveries for some hydride forming elements were observed, indicating element losses, possibly due to adsorption phenomenon.

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Series: Microchemical journal
ISSN: 0026-265X
ISSN-E: 1095-9149
ISSN-L: 0026-265X
Volume: 133
Pages: 645 - 649
DOI: 10.1016/j.microc.2017.04.042
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
1172 Environmental sciences
Funding: This study was carried out at the Sustainable Chemistry Research Unit of the University of Oulu and it was financially supported by the North Ostrobothnia Regional Fund of the Finnish Cultural Foundation (60152181).
Copyright information: © 2017 The Authors. Published by Elsevier Inc. This manuscript version is made available under the CC-BY-NC-ND 4.0 license