Pablo Richter

Pablo Richter
University of Chile · Departamento de Química Inorgánica y Analítica

Doctor en Ciencias

About

162
Publications
19,091
Reads
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2,698
Citations
Citations since 2016
52 Research Items
1269 Citations
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Additional affiliations
January 1997 - April 1997
Oklahoma State University - Stillwater
Position
  • PostDoc Position
November 1996 - September 2003
Centro Nacional del Medio Ambiente
Centro Nacional del Medio Ambiente
Position
  • Head of the Environmental Chemistry Laboratory
September 1991 - September 1992
University of Cordoba (Spain)
Position
  • Postdoctoral position

Publications

Publications (162)
Article
Triclosan (TCS) is an antibacterial compound used mainly in personal care products. Its widespread use for decades has made it one of the most widely detected compounds in environmental matrices and in biological fluids. Although it has been shown to be an endocrine disruptor in rats and aquatic species, its safe use by humans is unclear. The aim o...
Article
Novel passive samplers based on cork as a sorbent phase were implemented for the sampling and preconcentration of triclosan in water. Two sampler configurations were developed: The larger sampler (cork passive sampler, CPS) involved a Teflon casing to protect a circular laminar cork phase with a diameter of 4.3 cm, which was covered by polyethersul...
Article
Phthalate acid esters (PAEs) concentration in bottled water and different factors (water pH, storage time, sunlight exposure, and temperature) that affect/control them have become hot topics during recent years. Nevertheless, quite contradictory results and disagreements on the effects of these factors have been published. In an attempt to find som...
Article
For me, being the Director of CENMA was a very important challenge because it involved setting up and then running a very complete analytical lab in all areas of the environment and with the best equipment in the country, together with a team of carefully selected young chemists from the country.
Article
A critical review of rotating-disk sorptive extraction (RDSE) is presented. This review reports the principles of RDSE regarding fundamentals, evolution and applications. RDSE is based on the extraction equilibrium between a sorptive phase and an aqueous phase that are in continuous contact and movement during extraction. The main advantage of this...
Article
A derivative spectrofluorimetric method for simultaneous determination of enrofloxacin (EFX) and ciprofloxacin (CFX) in cow milk was developed. The sample preparation was based on rotating disk sorptive extraction (RDSE) using Oasis HLB® as extraction phase and followed by desorption of the analytes with methanol. The final extracts were evaluated...
Article
A novel application of rotating disk sorptive extraction (RDSE), using a styrene-divinylbenzene (S-DVB) sorbent for the extraction of antibiotic residues in milk was developed. The analytes studied were oxytetracycline and its 4-epimer, enrofloxacin, ciprofloxacin, sulfadoxine and trimethoprim. After RDSE, the analytes were determined by performing...
Article
Different clean-up stages were coupled to rotating-disk sorptive extraction (RDSE) of testosterone, progesterone, 17β-estradiol and triclosan in urine samples prior to derivatization and detection by gas chromatography-mass spectrometry (GC-MS). By using Oasis® HLB as the sorptive phase, extraction equilibrium was reached after 60 min at a disk rot...
Article
Full-text available
The synthesis and phase characterisation of a homologous series of monomers of acrylic phenyl benzoates has been carried out. The characterisation comprises polarised optical microscopy, differential scanning calorimetry and powder x-ray diffractometry. All monomers are mesogenic, exhibiting either nematic and/or smectic phase. Shorter monomers are...
Article
An analytical methodology has been developed and validated for the purpose of identifying and quantifying four parabens (methylparaben, ethylparaben, propylparaben and n-butylparaben) in water samples. The combination of rotating disk sorptive extraction (RDSE) technology with ultra-high performance liquid chromatography (UHPLC), along with electro...
Article
The determination of eight phthalates in plastic bottled water, namely, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, dibutyl phthalate, benzyl butyl phthalate, 2-ethylhexyl adipate, 2-ethylhexyl phthalate, and di-n-octyl phthalate, was carried out for the first time using a green extraction/preconcentration technology by rotating disk...
Article
In this study, a high throughput approach to rotating-disk sorptive extraction (RDSE) using laminar cork as extraction phase is demonstrated for the first time in the determination of 20 multiclass organic micro-pollutants including pesticides, PAHs and UV filters compounds from aqueous samples with gas chromatography mass spectrometry (GC-MS). The...
Article
This work reports for the first time the use of laminar cork as a sorptive phase in a microextraction technique, rotating-disk sorptive extraction (RDSE). Typical hormones (estrone, estradiol, estriol and ethinyl estradiol) were selected as analyte models and extracted from wastewater samples on laminar cork with statistically equivalent extraction...
Article
In this study, a novel environmentally-friendly approach was developed to overcome certain limitations in the analysis of solid food samples. An experimental setup based on solid-phase microextraction apparatus coupled to a rotating disk device is proposed for the determination of polar and slightly-polar pesticides including carbofuran, molinate,...
Article
An efficient method has been developed for the multiresidue and multiclass determination of 16 emerging contaminants (parabens, hormones, anti-inflammatory drugs, triclosan and bisphenol A) in water samples using rotating-disk sorptive extraction (RDSE) and gas chromatography coupled to mass spectrometry (GC-MS). Silylation of the compounds prior t...
Article
Inorganic polymers in aqueous solutions are being proposed as essential components in new theories concerning non‐classical nucleation and growth of nanominerals relevant to environmental nanogeosciences. The study of those complex natural processes requires multi‐technique analytical approaches able to characterize the solutions and their constitu...
Article
A method combining liquid chromatography with a dual-probe ultraspray electrospray ionization (ESI) source and time-of-flight high-resolution mass spectrometry (LC-ESI-TOF/MS) was developed for the simultaneous determination of four steroidal sex hormones, estrone (E1), 17β-estradiol (E2), 17α-ethinyl estradiol (EE2), and estriol (E3), as well as f...
Article
Full-text available
Se investigó la composición elemental total y la fracción soluble en agua de PM10 en tres áreas urbanas diferentes de Santiago de Chile, del centro a los suburbios. Las muestras de PM10 recogidas durante el mes de mayo (mediados del otoño en el hemisferio sur) en 2006, 2008, 2009 y 2010 fueron analizadas para metales mayores y trazas, y la partició...
Article
In this study, the viability of applying cork and montmorillonite clay modified with ionic liquid as biosorbents in the rotating‐disk sorptive extraction technique was investigated. Specifically, this was aimed at the determination of methyl paraben, ethyl paraben, propyl paraben and isobutyl paraben, with separation/determination by high‐performan...
Conference Paper
Full-text available
Inorganic polymers in aqueous solutions are being regarded as essential components in new theories concerning non-classical nucleation and growth of nanominerals relevant to environmental nanogeosciences 1. The study of those complex natural processes requires multi-technique analytical approaches able to characterize the solutions and their consti...
Article
Mining residues management is one of the greatest challenges for mining companies around the world. The increasing consciousness of the general public and governments about the potential threat that those residues can pose to the environment is demanding consistent and precise methodologies for assessing the potential release of toxic metals. On th...
Article
A simple and efficient solvent-free method for the quantification of total polychlorinated biphenyls (PCBs) in solid waste matrices by gas chromatography-mass spectrometry is proposed. Solid waste matrices spiked with Aroclor 1242 and Aroclor 1254 were used in this study. In this new approach, the cavity of the rotating disk device is loaded with t...
Article
Full-text available
The bioavailability of polychlorinated biphenyls (PCBs) in soils amended with biosolids was estimated using an aqueous leaching process of the compounds combined with rotating disk sorptive extraction (RDSE), and compared with bioavailability determined through of PCB absorption in wheat plants growing in the same soil–biosolid matrix. The matrices...
Conference Paper
Full-text available
Electrospray ionization source mass spectrometry (ESI-MS) is one of the most powerful and robust analytical techniques for the characterization and quantification of organic molecules. Additionally, it hosts a (yet to be discovered) tremendous potential for the study of the role played by inorganic polymeric precursors in nanomineral nucleation and...
Article
Full-text available
Biosolids contain inorganic and organic contaminants, including pharmaceutical and personal care products (PPCPs) that have accounted for a series of emerging contaminants, such as triclosan (TCS) and the hormone 17?-ethinylestradiol (EE2). The general aim of this study was to evaluate the effects of biosolid application on EE2 and TCS adsorption a...
Article
Montmorillonite (MMT) clays were modified by the intercalation into their galleries of ionic liquids (IL) based on imidazolium quaternary ammonium salts. This new eco-materials exhibited good features for use as a sorptive phase in the extraction of low-polarity analytes from aqueous samples. Spectroscopic analyses of the modified clays were conduc...
Article
Full-text available
In this study, a new method for determination of triclabendazole (TCB) as its main metabolites, triclabendazole sulfoxide (TCB-SO) and triclabendazole sulfone (TCB-SO2) in animal plasma was developed. TCB is widely used as antiparasitic in the veterinary industry. Rotating disk sorptive extraction (RDSE) was the selected sample preparation techniqu...
Article
Full-text available
Abiotic stress has a growing impact on plant growth and agricultural activity worldwide. Specific plant growth promoting rhizobacteria have been reported to stimulate growth and tolerance to abiotic stress in plants, and molecular mechanisms like phytohormone synthesis and 1-aminocyclopropane-1-carboxylate deamination are usual candidates proposed...
Article
Full-text available
Purpose Triclosan (TCS, 5-chloro-2-(2,4-dichlorophenoxy) phenol) an antimicrobial compound used in a range of household products, is an emerging hydrophobic organic contaminant, that may be incorporated into soil through the application of biosolids. The present study assessed the bioavailable fraction of TCS in a soil-biosolid system using wheat (...
Article
A simple and green analytical method based on the use of rotating disk sorptive extraction is reported for the simultaneous determination of hormones in wastewater. The analytes were 17β-estradiol, estriol, and 17α-ethinylestradiol. The analytes were separated and preconcentrated by rotating disk sorptive extraction and derivatized with N-methyl-N-...
Article
A method was developed for the identification and quantification of oxytetracycline residues present in salmon muscle and skin using UV-Vis derivative spectrophotometry. With this method, it was possible to reduce the number of steps in the procedure typically required for instrumental analysis of a sample. The spectral variables, order of the deri...
Article
Full-text available
The rotating disk sorptive extraction (RDSE) technique was applied in this study to the extraction of 16 polycyclic aromatic hydrocarbons (PAHs) in real water samples. The sorptive and desorptive behavior of the analytes were studied by using a rotating disk coated with polydimethylsiloxane (PDMS) on one of its surfaces. The optimal conditions for...
Article
Full-text available
This study demonstrates the first use of polydimethylsiloxane (PDMS) immobilized on a rotating disk for the extraction of copper from aqueous matrices and its subsequent direct determination by solid phase UV-Visible spectrophotometry. To accomplish the solid-phase extraction and the direct solvent-free spectrophotometric measurement, sodium diethy...
Article
Full-text available
Purpose This study assessed the effect of biosolid application on the bioavailable fraction of some trace elements (Cu, Cr, Ni, and Zn) using a bioassay with sunflower (Helianthus annuus) and a chemical assay, diffusion gradient in thin films (DGT). Materials and methods Five surface soil samples (0–20 cm) were collected from an agricultural zone i...
Article
Full-text available
The extraction device used in rotating-disk sorptive extraction consists of a Teflon disk in which a sorptive phase is fixed on one of its surfaces. Depending on the configuration, the rotation axis of the disk device can be either perpendicular or parallel to its radius, giving rise to two different mass transfer patterns when rotating-disk sorpti...
Article
Full-text available
A novel extraction approach was developed based on rotating-disk sorptive extraction (RDSE). In this approach the rotating-disk extraction device consists of a Teflon disk, with a cavity that is loaded with a commercial sorbent phase selected according to the polarity of the analyte. To avoid leakage of the sorbent, the cavity is covered with a fib...
Article
Full-text available
A rapid and efficient method based on the integration of pressurized solvent extraction (PSE) with solid phase extraction (SPE) cleanup and gas chromatography system with electron capture detection (GC-ECD) has been developed for determination of polychlorinated biphenyls (PCBs). Six indicators and twelve dioxin-like PCBs were selected as analytes....
Article
The microextraction of crystal violet (CV) from water samples into polydimethylsiloxane (PDMS) using the rotating disk sorptive extraction (RDSE) technique was performed. The extracting device was a small Teflon disk that had an embedded miniature magnetic stirring bar and a PDMS (560μL) film attached to one side of the disk using double-sided tape...