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Author Pina, S.; Candia-Onfray, C.; Hassan, N.; Jara-Ulloa, P.; Contreras, D.; Salazar, R. doi  openurl
  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.  
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  ISSN 2227-9040 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000653570100001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1389  
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Author Pina, S.; Sandoval, A.M.; Jara-Ulloa, P.; Contreras, D.; Hassan, N.; Coreno, O.; Salazar, R. doi  openurl
  Title Nanostructured electrochemical sensor applied to the electrocoagulation of arsenite in WWTP effluent Type
  Year 2022 Publication Chemosphere Abbreviated Journal Chemosphere  
  Volume 306 Issue Pages 135530  
  Keywords Arsenic elimination; Electrocoagulation; Electrochemical sensor; Wastewater treatment; Environmental pollutants  
  Abstract A sensitive electroanalytical method for the determination of arsenite, based on a heterostructure of aminated multiwalled carbon nanotubes and gold nanoparticles, was applied in an electrocoagulation (EC) treatment for the elimination of arsenite. A sensitive quantitative response was obtained in the determination of As3+ in a secondary effluent from a wastewater treatment plant from Santiago (Chile). The preconcentration stage was optimized through a Central Composite Face design, and the most sensitive peak current was obtained at 200 s and -600 mV of time and accumulation potential, respectively, after a differential pulse voltammetry sweep. Electroanalytical determination was possible in an interval between 42.89 and 170.00 mu g L-1 with a detection limit of 0.39 mu g L-1, obtaining recoveries over 99.1%. The developed method was successfully applied in an electrocoagulation treatment to remove 250 mu g L-1 of arsenite from a polluted effluent in a batch system. Complete arsenite removal was achieved using a steel EC system with a current density of 6.0 mA cm(-2) in less than 3 min of treatment.  
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  Series Volume Series Issue Edition  
  ISSN 0045-6535 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000828037200004 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1624  
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