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Author Pina, S.; Candia-Onfray, C.; Hassan, N.; Jara-Ulloa, P.; Contreras, D.; Salazar, R.
Title Glassy Carbon Electrode Modified with C/Au Nanostructured Materials for Simultaneous Determination of Hydroquinone and Catechol in Water Matrices Type
Year 2021 Publication Chemosensors Abbreviated Journal Chemosensors
Volume 9 Issue 5 Pages 88
Keywords ENDOCRINE DISRUPTING COMPOUNDS; IONIC LIQUID COMPOSITE; GOLD NANOPARTICLES; ELECTROCHEMICAL SENSOR; ELECTROCATALYTIC OXIDATION; VOLTAMMETRIC DETERMINATION; ANALYTICAL-CHEMISTRY; PASTE ELECTRODE; NANOTUBES; RESORCINOL
Abstract The simultaneous determination of hydroquinone and catechol was conducted in aqueous and real samples by means of differential pulse voltammetry (DPV) using a glassy carbon electrode modified with Gold Nanoparticles (AuNP) and functionalized multiwalled carbon nanotubes by drop coating. A good response was obtained in the simultaneous determination of both isomers through standard addition to samples prepared with analytical grade water and multivariate calibration by partial least squares (PLS) in winery wastewater fortified with HQ and CT from 4.0 to 150.00 mu M. A sensitivity of 0.154 mu A mu M-1 and 0.107 mu A mu M-1, and detection limits of 4.3 and 3.9 mu M were found for hydroquinone and catechol, respectively. We verified the reliability of the developed method by simultaneously screening analytes in spiked tap water and industrial wastewater, achieving recoveries over 80%. In addition, this paper demonstrates the applicability of chemometric tools for the simultaneous quantification of both isomers in real matrices, obtaining prediction errors of lower than 10% in fortified wastewater.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2227-9040 ISBN Medium
Area Expedition Conference
Notes WOS:000653570100001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1389
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Author Seccatore, J.; de Theije, M.
Title Socio-technical study of small-scale gold mining in Suriname Type
Year 2017 Publication Journal Of Cleaner Production Abbreviated Journal J. Clean Prod.
Volume 144 Issue Pages 107-119
Keywords Artisanal mining; Suriname; Gold; Mercury
Abstract Small-scale gold mining is Suriname's main economic sector, producing about two thirds of the nation's gold. Despite this, the sector is only very loosely regulated and most small-scale mining activities are informal. Surinamese miners are only a minority: the majority are Brazilian migrants, who have no right to the land and therefore have to pay a percentage of their production for land use. This study reports the findings of a field mission to small-scale mines in the region of Brokopondo reservoir. We document the technical aspects of small-scale gold mining in Suriname and contextualize this technology to social issues to identify links with cultural, political and sociological factors. Our findings show that informality and insecurity lead to a mine management culture that applies short-term solutions, such as cheap but polluting and inefficient technologies, and fails to produce stable, long-term mining conditions for clean, efficient technology and secure business planning. We conclude that the social context of the mining economy in Suriname strongly interacts with the technologies employed. (C) 2016 Elsevier Ltd. All rights reserved.
Address [Seccatore, Jacopo] Adolfo Ibanez Univ, Fac Sci & Engn, Vina Del Mar, Chile, Email: jacopo.seccatore@usp.br
Corporate Author Thesis
Publisher Elsevier Sci Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0959-6526 ISBN Medium
Area Expedition Conference
Notes WOS:000393249300011 Approved
Call Number UAI @ eduardo.moreno @ Serial 698
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