José Antonio López-López

José Antonio López-López
Universidad de Cádiz | UCA · Department of Analytical Chemistry

PhD in Analytical Chemistry

About

41
Publications
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667
Citations
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April 2006 - present
Universidad de Cádiz
Position
  • Professor (Assistant)

Publications

Publications (41)
Article
Full-text available
In this work, we explore a new dispersive liquid–liquid microextraction (DLLME) method to selectively separate chemical species of Cd and Zn in saline waters. It is based on the use of the magnetic ionic liquid (MIL) methyltrioctylammonium tetrachloroferrate ([N 1,8,8,8 ⁺ ][FeCl 4 ⁻ ]), which allows an efficient and environmentally friendly extract...
Article
Full-text available
Bioaccumulation patterns of heavy metals (Pb, Cd, Cr, Ni, Fe and Cu) and organic (priority and emerging) pollutants, in combination with stable isotope analysis (SIA), were assessed in muscle and liver of three tuna species from the Gulf of Cadiz (Atlantic bluefin tuna, Thunnus thynnus; Atlantic bonito, Sarda sarda, and skipjack tuna, Katsuwonus pe...
Chapter
Ionic liquids (ILs) play a crucial role in modern chemistry and chemical engineering. They remain more desirable than conventional volatile solvents and catalysts in many physical and chemical processes, often exhibiting green and designer properties for various applications. Examining the unique contribution of ILs towards current environmental ch...
Article
Full-text available
Due to its important environmental role, the analysis of trace metals in natural waters is attracting increasing attention; consequently, faster and more accurate analytical methods are now needed to reach even lower limits of detection. In this work, we propose the use of electro-membrane extraction (EME) to improve analytical methods based on hol...
Article
Full-text available
In this work, the reagent Cyanex® 272 has been incorporated in a three-phase solvent bar micro-extraction system to selectively separate the inorganic and organic fractions of copper in seawater. Optimized conditions for micro-extraction of Cu fractions were 0.2 M Cyanex® 272 in the organic solution contained into the fiber pores, 0.5 M HCl as acce...
Article
Full-text available
Background Engineered stone silicosis is an emerging disease in many countries worldwide produced by the inhalation of respirable dust of engineered stone. This silicosis has a high incidence among young workers, with a short latency period and greater aggressiveness than silicosis caused by natural materials. Although the silica content is very hi...
Article
Full-text available
Liquid phase micro-extraction (LPME) of metals has showed its potential for sample preparation in environmental analysis. In particular, the incorporation of ionic liquids to LPME (IL-LPME) has gotten increasing interest due to their unique properties as organic salts liquid at room temperature. In the last years, IL-LPME of metals has evolved to m...
Article
Full-text available
Popularity of hollow fiber-supported liquid membranes (HF-SLM) for liquid-phase microextraction (HF-LPME) has increased in the last decades. In particular, HF-SLM are applied for sample treatment in the determination and speciation of metals. Up to the date, optimization of preconcentration systems has been focused on chemical conditions. However,...
Article
Full-text available
We investigated the applicability of three task-specific ionic liquids (ILs) as heavy metal extracting agents by contrasting extraction capabilities with algal toxicity. The compounds tested were trihexyltetradecylphosphonium-, methyltrioctylphosphonium- and methyltrioctylammonium 3-hydroxy-2-naphthoates. Experiments were performed to assess if the...
Article
Existing methods for the extraction of priority metallic pollutants as Ag, Cd, Cu, Ni and Zn from saline waters present limited efficacy due to the high complexity of the water matrix, which affects metals speciation. There is a lack of reagents for the efficient extraction of the metal chlorocomplexes formed at the natural pH of saline waters, req...
Article
Hollow fibre-supported liquid membrane was used for Cu fractionation in marine waters, using di-2-pyridylketone benzoylhydrazone (dPKBH) as a carrier due to its capacity to transport dissolved inorganic Cu at natural seawater pH. Optimized conditions were dPKBH (0.5 mmol L⁻¹), HNO3 (0.5 mol L⁻¹) as acceptor agent, extraction time of 120 min and sti...
Article
Transition metals Cd, Pd and Ag are toxic even at very low concentration. Cd is considered a priority substance; while, Pd and Ag are emerging pollutants. Membrane technologies have been applied for their extraction; however, they require important amounts of reagents, time and energy. Additionally, effective reagents for metal extraction in saline...
Article
Water pollution by metals and, in particular, acid mine drainage (AMD) is one of the most severe environmental problems to be faced by society. In this sense, treatment by membrane processes is a promising alternative, highlighting membrane distillation (MD) features to overcome the limitations of conventional processes. In this work, water gap MD...
Article
Ag can be found in the ocean at the ultra-trace level, mainly as AgCln(n−1)− and complexed by dissolved organic matter (Ag-DOM). However, methods for studying Ag speciation in marine waters are limited by the lack of extractants capable to separate organic and inorganic silver species in natural conditions of seawater samples. In this work, a two-...
Article
Solvent bar micro-extraction (SBME) was introduced to improve some aspects of hollow fiber liquid phase micro-extraction. It has rapidly evolved and gained increasing interest. In SBME the fiber can be left freely tumbling in the sample during extraction. Consequently, the procedure is simplified, portability of the micro-extraction system is impro...
Article
Full-text available
Developments in the liquid micro-extraction of trace metals from aqueous phases have proven to be limited when extended from pure water to more complex and demanding matrices such as sea water or wastewater treatment effluents. To establish a system that works under such matrices, we successfully tested three task-specific ionic liquids, namely tri...
Article
The use of ionic liquids for micro-extraction of metals has been popularized during the last decades. The main drawback for this application of ILs is leaching into the sample. Hollow fiber liquid phase micro-extraction might be a promising approach due to the immobilization of the ILs during the extraction process. Herein, we evaluate the abilitie...
Article
Full-text available
Ionic liquids (ILs) are per definition salts with melting points below 100°C and might be green alternatives for the extraction of heavy metals from aqueous solutions due to their favorable environmental and physico-chemical properties. Partial solution during extraction, so-called leaching, however, limits their applicability. The present study sy...
Article
Water analysis of trace metals has been benefited by recent studies on sample preparation by liquid micro-extraction. However, there are still limitations for its application to seawater, such as the need of additives to preserve the sample or the availability of chemical extractants for the selective extraction from highly saline samples. In this...
Article
A simple and economical spectrofluorimetric alternative for aluminium determination in bivalve mollusks based on the fluorescent blue-green colour complex between Al(III) and salicylaldehyde picolinoylhydrazone (SAPH) has been studied. The factors that are most likely to affect were optimized with a Box-Behnken design. Optimum conditions were: pH 6...
Article
Mea­sur­ing the im­pact of PAHs in sea­wa­ter sam­ples is of­ten dif­fi­cult due to the low con­cen­tra­tions in which they ap­pear and the com­plex­ity of the sam­ple ma­trix. Tra­di­tional meth­ods for sam­ple prepa­ra­tion such as liq­uid-liq­uid ex­trac­tion and solid phase ex­trac­tion re­quire the use of ex­ces­sive amounts of sol­vents and r...
Article
Cadmium (Cd) and silver (Ag) are naturally occurring metals in saline natural waters, which may present toxic effects even at trace level. Membrane technology has been widely applied for their extraction, including hollow fiber supported liquid membranes. However, their application to saline waters is limited. In this work, a hollow fiber liquid mi...
Article
Main drawbacks for silver determination in seawater are the effects of samples matrix and that Ag appears in the sub ng L⁻¹. Available methods for sample preparation in Ag analysis are based on solid and liquid extraction using tedious process that increase the cost of analysis and the risk of sample contamination, producing important waste amounts...
Article
Trends in the analysis of trace metals in natural waters are mainly based on the development of sample treatment methods to isolate and pre-concentrate the metal from the matrix in a simpler extract for further instrumental analysis. However, direct analysis is often possible using more accessible techniques such as spectrophotometry. In this case...
Article
During the last decade, hollow fiber liquid phase micro-extraction (HF-LPME) has become an attractive alternative in sample treatment for the analysis of trace metals in seawater. If compared with other similar methodologies, its main advantages are associated to a higher stability of the organic solution contained into the pores of the fiber, whic...
Article
A simple and direct spectrophotometric method was developed for analysis of Fe(II) and total Fe, in wine samples. This method is based on the formation of an Fe(II) complex with 2,2´-dipyridylketone picolinoylhydrazone (DPKPH), which shows a maximum green-blue absorption (l=700 nm) at pH 4.9. Operative conditions for the batch procedure were invest...
Article
Silver ion inputs into the environment due to human activities have been increased in the last years because it has been used as a bactericide with application in medical, homecare and self-care products. In addition, it is toxic at low concentration for aquatic organisms. In estuarine waters, salinity and dissolved organic matter (DOM) regulate...
Article
Alongside history, human activities have contributed to the deployment of environmental quality. In particular, during the last decades the problem of water preservation has gained increasing attention. Statistical analysis is essential to analyze environmental data and to identify trends of pollutants over space and time. Usually applied technique...
Article
Silver pollution has gained attention in the last years because silver is being massively used as a bactericide in self-care, medical and textile products. Difficulties of Ag determination are associated with the very low concentrations in which it is normally found (ng L-1) and the nature of sample matrix. Standard methods as liquid-liquid extract...
Article
Full-text available
In the lower Guadalquivir river basin, a system stressed by a wide variety of anthropogenic activities, eight pesticides (four triazines, two chloroacetanilide herbicides, one organochlorine, and one organophosphorus insecticide); and four emerging pollutants (two personal care products, one organophosphorous flame retardant, and one xanthine alkal...
Article
Silver is recognized as an important pollutant of natural waters. This element is a selective tracer of anthropogenic pollution related to sewage. Studying its bio-availability requires the application of specific separation of the free ion. A liquid membrane is proposed for separating Ag(+) from estuarine water samples. A bulk liquid membrane (BLM...
Article
Full-text available
Heavy metals are normally found, in natural waters, in very low concentrations. Some of them are essential for life in low level; however, in higher level they are toxic. Therefore, analyzing their bio-available fraction is of main interest. Standard methodology is based in the collection of a number of samples from a water body. Collected samples...
Article
Full-text available
Human activities have contributed to a deployment of environmental quality. In the last decades the problem of water preservation has gained increasing attention, and new policies have been developed for water resources remediation. Statistical techniques for data treatment are based on the organization of data in a bi-dimensional array; thus, some...
Article
The use of different products containing silver in anthropic activities has caused the increase of silver concentrations in many water courses. To establish their toxic effects, both precise and accurate analytical methods are needed to quantify silver at very low concentrations. Although different methods may be found in the literature, in practic...
Article
Full-text available
En el presente trabajo se exponen las bases de la metodología de microextracción en fase líquida con membranas capilares de fibra hueca (HF-LPME), técnica en la que se basa una de las líneas de investigación del grupo de Geoquímica Marina de la Universidad de Cádiz, especialmente su aplicación al análisis de compuestos inorgánicos en aguas naturale...
Article
To establish the quality of waters it is necessary to identify both point and non-point pollution sources. In this work, we propose the combination of clean analytical methodologies and chemometric tools to study discrete and diffuse pollution caused in a river by tributaries and precipitations, respectively. During a two-year period, water samples...
Article
Liquid-membrane (LM) technology, traditionally used for metals recovery in metallurgy, has attracted increasing interest in chemical analysis in recent years. As a pre-concentration tool for metals determination in natural waters, including seawater, LMs have important advantages over traditional solvent extraction (e.g., minimal risk of sample con...
Article
The direct synthesis of several b- and c-lactones used as electrophilic sources of chlorine, sodium hypochlorite and a Lewis acid is described. The scope and limitations of the method are discussed.

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