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Author

Haroldo Silveira Dórea

Other affiliations: University of São Paulo
Bio: Haroldo Silveira Dórea is an academic researcher from Universidade Federal de Sergipe. The author has contributed to research in topics: Matrix (chemical analysis) & Gas chromatography. The author has an hindex of 17, co-authored 28 publications receiving 746 citations. Previous affiliations of Haroldo Silveira Dórea include University of São Paulo.

Papers
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TL;DR: In this paper, a study was carried out to evaluate preliminarily the BTEX, polycyclic aromatic hydrocarbons (PAHs), and metals contents in produced water samples taken from effluents of the Bonsucesso treatment plant located in the city of Carmopolis, North-east of Brazil.

128 citations

Journal ArticleDOI
TL;DR: The structure of the benthic macrofaunal assemblages of the estuarine portion of Paraguacu River, NE, Brazil, and its relationship with surface sediment characteristics (trace metals, PAHs, nutrients and grain size) and physical variables were investigated at ten stations on two contrasting occasions, summer (dry season) and winter (rainy season) as discussed by the authors.
Abstract: The structure of the benthic macrofaunal assemblages of the estuarine portion of Paraguacu River, NE, Brazil, and its relationship with surface sediment characteristics (trace metals, PAHs, nutrients and grain size) and physical variables were investigated at ten stations on two contrasting occasions, summer (dry season) and winter (rainy season). A total of 1258 individuals (632 in winter and 626 in summer) and 62 taxa representing polychaetes, crustaceans, bivalves, echinoderms, bryozoans, sponges, cnidarians and cephalochordates were collected. Benthic assemblages in the upper estuary were unlike those in the lower estuary and a clear substitution of benthic taxa along the estuary was observed. Macrofaunal invertebrates in the low salinity region, composed of coarse sediments, were dominated by tellinids, venerids (bivalves), cirolanids (isopods), cyclopoids (copepods), and nereidids (polychaetes). While the high salinity region, composed of fine sediments, were dominated by nuculids (bivalves), cirratulids (polychaetes), and by amphiurids (ophiuroids). The Paraguacu estuarine system is not severely affected by anthropogenic activities. In the great majority of the study sites, concentrations of trace metals and PAHs in the sediments were near background values. Nutrients values were also low. We formulated new models of taxon distribution and suggested detailed studies on the effects of salinity variation and studies using functional approaches to better understand the processes causing the spatial patterns in tropical estuarine benthic assemblages.

75 citations

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TL;DR: The optimized SPME method was applied in analysis of hair samples from Cannabis drug users, showing that CBN and CBD were present in all samples analyzed.

64 citations

Journal ArticleDOI
30 Jul 2008-Talanta
TL;DR: A simple and effective extraction method based on matrix solid-phase dispersion (MSPD) was developed to determine dimethoate, malathion, lufenuron, carbofuran, 3-hydroxycarb ofuran, thiabendazole, difenoconazole and trichlorfon in coconut pulp using gas chromatography-mass spectrometry with selected ion monitoring (GC/MS, SIM).

63 citations

Journal ArticleDOI
TL;DR: A method based on solid-phase microextraction (SPME) and gas chromatography with flame ionization detection (GC-FID) has been optimized for the determination of benzene, toluene, ethylbenzene and xylenes (BTEX) in water released from a waste treatment plant.

45 citations


Cited by
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Journal ArticleDOI
TL;DR: Results published indicate that in some sites, intrinsic bioremediation can reduce the monoaromatic compounds content of contaminated water to reach standard levels of potable water, however, engineering biOREmediation is faster and more efficient.

367 citations

Journal ArticleDOI
TL;DR: A review of the many uses of matrix solid phase dispersion (MSPD) in the extraction and analysis of a variety of compounds from a range of samples is provided.

342 citations

Journal ArticleDOI
TL;DR: This review serves to provide a compilation of recent research concerning the behavior of bees in relation to resins and propolis, focusing more on the bees themselves and the potential evolutionary benefits of resin collection.
Abstract: Social immunity, which describes how individual behaviors of group members effectively reduce disease and parasite transmission at the colony level, is an emerging field in social insect biology. An understudied, but significant behavioral disease resistance mechanism in honey bees is their collection and use of plant resins. Honey bees harvest resins with antimicrobial properties from various plant species and bring them back to the colony where they are then mixed with varying amounts of wax and utilized as propolis. Propolis is an apicultural term for the resins when used by bees within a hive. While numerous studies have investigated the chemical components of propolis that could be used to treat human diseases, there is a lack of information on the importance of propolis in regards to bee health. This review serves to provide a compilation of recent research concerning the behavior of bees in relation to resins and propolis, focusing more on the bees themselves and the potential evolutionary benefits of resin collection. Future research goals are also established in order to create a new focus within the literature on the natural history of resin use among the social insects and role that propolis plays in disease resistance.

337 citations

Journal ArticleDOI
TL;DR: In this paper, the authors highlight characteristics of produced water in detail and physical, chemical, and biological techniques used for its treatment, and reuse of produced waters for different purposes has been discussed.
Abstract: In oil and gas industry, produced water is considered as the largest waste stream, which contains relatively higher concentration of hydrocarbons, heavy metals and other pollutants. Due to the increase in industrial activities, the generation of produced water has increased all over the world and its treatment for reuse is now important from environmental perspective. Treatment of produced water can be done through various methods including physical (membrane filtration, adsorption etc.), chemical (precipitation, oxidation), and biological (activated sludge, biological aerated filters and others) methods. This paper aims to highlight characteristics of produced water in detail and physical, chemical, and biological techniques used for its treatment. In addition, reuse of produced water for different purposes has been discussed. At the end, few case studies from different countries, related to the treatment and reuse of their produced waters have been included.

327 citations

Journal ArticleDOI
TL;DR: The Societe Francaise de Chimie, die Gesellschaft Deutscher Chemiker und der Springer-Verlag haben die Zeitschrift „Analytical and Bioanalytical Chemistry” gegrundet as mentioned in this paper.
Abstract: Die Societe Francaise de Chimie, die Gesellschaft Deutscher Chemiker und der Springer-Verlag haben die Zeitschrift „Analytical and Bioanalytical Chemistry” gegrundet.

317 citations