6 documents found, page 1 of 1
The impact of urbanization on tropical mangroves (Fortaleza, Brazil): Evidence ...
Cavalcante, Rivelino M.; Sousa, Francisco W.; Nascimento, Ronaldo F.; Silveira, Edilberto R.; Freire, George S. S.This investigation represents the first environmental diagnosis of the distribution and sources of polycyclic aromatic hydrocarbons (PAHs) in sediments from a tropical mangrove in Fortaleza, northeastern Brazil. Sediment cores from six sampling stations in the Coco´ and Ceara´ Rivers were retrieved in JuneJuly 2006 to determine 17 priority PAHs. The total PAH concentrations (SPAHs) ranged from 3.04 to 2234.76 m...
Utilização da extração em fase sólida (SPE) na determinação de hidrocarbonetos ...
Cavalcante, Rivelino M.; M. Filho, Nilton S.; Viana, Rommel B.; Oliveira, Isadora R. N.; Nascimento, Ronaldo F.; Silveira, Edilberto R.Polycyclic aromatic hydrocarbons (PAHs) are a great environmental concern mainly because of their toxic, mutagenic and carcinogenic potential. This paper reports utilization of the solid-phase extraction (SPE) technique to determine PAHs in environmental aqueous matrices. The recovery from environmental aqueous matrices fortified with PAHs varied from 63.7 to 93.1% for atmospheric liquid precipitation, from 38....
Evaluation of two biosorbents in the removal of metal ions in aqueous using a p...
Oliveira, André G.; Ribeiro, Jefferson P.; Melo, Diego Q.; Sousa, Francisco W.; Sousa Neto, Vicente O.; Raulino, Giselle S. C.: The aim of the present work was to investigate the adsorption of toxic metal ions copper, nickel and zinc from aqueous solutions using low cost natural biomass (sugar cane bagasse and green coconut fiber) in pilot scale fixed-bed system. The Hydraulic retention time (HRT) was 229 minutes and the lowest adsorbent usage rate (AUR) found was 0.10 g.L-1 for copper using green coconut fibers. The highest values of...
Evaluation of polycyclic aromatic hydrocarbons in asphalt binder using matrix s...
Fernandes, Paulo R.N.; Soares, Sandra de A.; Nascimento, Ronaldo F.; Soares, Jorge B.; Cavalcante, Rivelino MartinsA method developed for the extraction and analysis of polycyclic aromatic hydrocarbons (PAHs) in the asphalt binder using a matrix solid-phase dispersion (MSPD) and gas chromatography is presented. The MSPD method was proposed as a rapid and easy approach to determining PAHs present in the maltenic phase of asphalt binder extracted through a mechanical shaking and sonication of the material. The recovery rates ...
Influence of anthropogenic activities and risk assessment on protected mangrove...
Santos, Felipe R.; Martins, Davi A.; Morais, Pollyana C.V.; Oliveira, André H.B.; Gama, Allyne F.; Nascimento, Ronaldo F.Made available in DSpace on 2019-10-06T16:08:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-03-15; Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Anthropogenic molecular markers were used to assess chemicals inputs and ecological risks associated from multiple sources to sediments in one of the largest trop...
Influência do material do alambique na composição química das aguardentes de ca...
Nascimento, Ronaldo F.; Cardoso, Daniel R.; Lima Neto, Benedito dos Santos; Franco, Douglas Wagner; Farias, João Bosco [UNESP]Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:48:24Z No. of bitstreams: 1 S0100-40421998000600013.pdf: 300948 bytes, checksum: 6322a8d9926616862350c2c311a88e54 (MD5); Made available in DSpace on 2013-08-22T18:48:25Z (GMT). No. of bitstreams: 1 S0100-40421998000600013.pdf: 300948 bytes, checksum: 6322a8d9926616862350c2c311a88e54 (MD5) Previous issue date: 1998-11-01; Made availabl...