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Photochemical treatment strategies for okadaic acid degradation: Effects of salinity, oxidants, and UV sources

2025-09Journal article Open access
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dc.contributor.authorMoreno-Andrés, Javier
dc.contributor.authorLage, Sandra
dc.contributor.authorBraga, Ana Catarina
dc.contributor.authorReis Costa, Pedro
dc.date.accessioned2025-07-24T13:44:55Z
dc.date.available2025-07-24T13:44:55Z
dc.date.issued2025-09
dc.description.abstractThis study evaluates the degradation and detoxification of okadaic acid (OA), a marine biotoxin, through UVassisted photochemical processes using environmentally relevant OA concentrations. Experiments were conducted in distilled water (DW) and artificial seawater (ASW), applying two UV sources: UV-LED (lambda(max) = 275 nm) and low-pressure mercury lamp (LP-Hg; lambda = 254 nm), combined with hydrogen peroxide (HP), sodium peroxydisulfate (PDS), and potassium peroxymonosulfate (PMS). Photolysis alone was ineffective, and kinetic rate constants (k(obs); min(-1)) followed the trend UV/PMS > UV/PDS > UV/HP for both UV sources. While all treatments showed high OA removal (>79 %) in DW, degradation was significantly reduced for HP (72.8 %-89.9 %) and PDS (67.8 %-76.6 %) in ASW. In contrast, UV/PMS efficacy improved in saline media, achieving rapid and effective degradation of OA, and reaching 99 % detoxification (PP2A activity) within 15 min. The main transformation product, norokadanone (m/z 757.453), formed via decarboxylation, showed significantly reduced toxicity compared to OA. These results confirm the suitability of sulfate radical-based processes (particularly UV/ PMS) for OA mitigation in marine environments. In addition, this work highlights the critical role of water matrix composition in marine toxin treatment and supports the development of scalable, mercury-free strategies for effectively mitigating hazardous compounds in coastal environments.eng
dc.identifier.doi10.1016/j.marpolbul.2025.118183
dc.identifier.issn0025-326X
dc.identifier.urihttp://hdl.handle.net/10400.1/27489
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofMarine Pollution Bulletin
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectPhycotoxin
dc.subjectSeawater toxicity
dc.subjectSeawater treatment
dc.subjectUV-LED
dc.subjectAdvanced oxidation processes
dc.titlePhotochemical treatment strategies for okadaic acid degradation: Effects of salinity, oxidants, and UV sourceseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.startPage118183
oaire.citation.titleMarine Pollution Bulletin
oaire.citation.volume218
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameLage
person.familyNameReis Costa
person.givenNameSandra
person.givenNamePedro
person.identifier454970
person.identifier600820
person.identifier.ciencia-idDA15-C119-BDC8
person.identifier.ciencia-idC911-9715-E547
person.identifier.orcid0000-0003-0167-7163
person.identifier.orcid0000-0001-6083-470X
person.identifier.ridN-1908-2019
person.identifier.scopus-author-id54585529500
person.identifier.scopus-author-id7201895802
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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