Publicaciones 2011-2020

@article{RN277,
title = {Adsorption of as (V) by Poly (N-Octyl-4-Vinylpyridinium) Bromide: Determination of as (V) by Direct Measurement of Fluorescence on the Solid Phase},
author = { J. Gonz\'{a}lez-Navarrete and M.I. Toral and A. Leiva and M. Yazdani-Pedram and H. Rios and X. Briones and M. Urz\'{u}a},
url = {/brokenurl#<Go to ISI>://WOS:000390510200015},
doi = {10.1016/j.reactfunctpolym.2016.10.011},
issn = {1381-5148},
year = {2016},
date = {2016-01-01},
journal = {Reactive & Functional Polymers},
volume = {109},
pages = {112-119},
publisher = {2016 Elsevier B.V.},
abstract = {Adsorption of As (V) by poly (N-octyl-4-vinylpyridinium) bromide (P4VPyC8), used as solid phase, was studied. Determination of As (V) was carried out by direct measurement of the fluorescence intensity on the solid phase. Adsorption variables were optimized for obtaining optimum values of pH and agitation time, where pH 9.0 and 60 min were established as optimum values. The adsorption of arsenic (V) was characterized by infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. It was found that the fluorescence of the solid phase increases as the concentration of arsenic increases. Linearity was observed in the concentration range 6.80 to 90.0 mu g L-1. The detection limit for determination of As (V) by this method was 2.24 mu g L-1 and the relative standard deviation (RSD) was 1.72%. The amount of retained As (V) was 0.154 mg/g of solid phase. The determination of As (V) in a sample of tap water by this method was well compared with the value reported by an external certified laboratory. Therefore, the method of analysis proposed here could be used as a screening methodology for monitoring the fulfillment of the norm for arsenic concentration in tap water.},
keywords = {adsorption, arsenate, arsenic arsenic, atomic-absorption-spectrometry, carbon drinking-water, extraction, fluorescence, heavy-metal ions, nanotubes, performance phase, preconcentration, removal, samples, solid toxic water},
pubstate = {published},
tppubtype = {article}
}

@article{RN16,
title = {Determination of Cobalt in Water Samples by Photoacoustic Spectroscopy with a Solid-Phase Spectrophotometry Approach Using 3-(2-Pyridyl)-5,6-Bis (4-Sulfophenyl)-1,2,4-Triazine},
author = { R. Saavedra and C. Soto and J. Yanez and M.I. Toral},
url = {/brokenurl#<Go to ISI>://WOS:000290749600008},
doi = {10.1016/j.microc.2011.02.003},
issn = {0026-265x},
year = {2011},
date = {2011-01-01},
journal = {Microchemical Journal},
volume = {98},
number = {2},
pages = {220-224},
publisher = {2011 Elsevier B.V.},
abstract = {This work forms part of an investigation which seeks to determine metal complexes in a solid phase by photoacoustic spectrometry (PAS). Results of spectral determination of Co(II) complexes are introduced. The method is based on Co(II) calorimetric reaction with 3-(2-pyridyl)-5,6-bis(4-sulfophenyl)-1,2,4-triazine (FST, ferrozine) retained on an anion-exchange resin, DEAE Sephadex A-25. The immobilization of Co(II) on the solid phase is combined with PAS measurement. A numerical approach is applied to reduce noise in the spectral data. At lambda = 477 nm, the calibration for Co(II) is linear over the range 14-300 mu gL(-1). The Co(II) concentration in water samples was determined by conventional photoacoustic measurement. The relative standard deviation (R.S.D.) of the method for the calibration is <5%. Under optimized conditions, the obtained analytical features were LOD 14 mu gL(-1) and LOQ 45 mu gL(-1).},
keywords = {atomic-absorption-spectrometry, chelating cobalt, emission-spectrometry, extraction, ferrozine ferrozine, icp-ms, nickel, online optothermal phase photoacoustic preconcentration, resin, solid spectroscopy, trace-metals, window},
pubstate = {published},
tppubtype = {article}
}