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Author(s): Mónica S. F. Santos
Luís M. Madeira
Arminda Alves
Title: Paraquat quantification in deposits from drinking water networks
Issue Date: 2014
Abstract: The aim of this work was to develop an expeditious analytical methodology to evaluate the paraquat (PQ) contamination level in deposits from drinking water networks. To the best of our knowledge, no other study has focused on this matter, which is of crucial importance, for instance, to obtain a fast response after a suspicion of contamination (emergency situation). Three deposits representative of those typically found in drinking water networks were used: two iron-based - S2 and S3, and a calcium rich one - S4. The analytical method consists of an easy and fast extraction step, using a saturated ammonium chloride solution, followed by direct injection in a high performance liquid chromatograph with a diode array detector (HPLC-DAD). A matrix-matched calibration was performed for paraquat, in the range of 5 to 193 mu gPQ per g deposit, and a limit of detection of 0.1 mu gPQ per g deposit was reached. The good percentages of recovery (90-101% on average) and the tow relative standard deviations observed for the PQ-S3 system (3, 4 and 2% for 20, 80 and 160 mu gPQ per g deposit, respectively) enable a reliable quantification of paraquat, even at the lowest contamination levels. The developed analytical methodology can also be extended for diquat and also proved to be suitable for paraquat quantification in other types of deposits.
Subject: Ciências da engenharia e tecnologias
Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/217976 /Security and decontamination of drinking water distribution systems following a deliberate contamination /SECUREAU
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/AAC-AMB/101687/2008/Segurança química em sistemas de abastecimento de água/ACQUASAFE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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