Loading...
Please wait, while we are loading the content...
Similar Documents
Hidrocarbonetos policíclicos aromáticos (HPAs) em solo: validação de método e avaliação da influência da queima de cana-de -açúcar na região de Araraquara
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fujita, Claudia Kazumi |
| Copyright Year | 2009 |
| Abstract | The polycyclic aromatic hydrocarbons, PAHs, also usually called “polyaromatics” are compounds that possess two or more condensed aromatical rings in its structure. These substances constitute a group of micro polluntants and meet widely distributed in the environment, being able to be detected in the soil, mainly due to processes of atmospheric deposition. The interaction of the PAHs with the soil occurs through the organic substance adhered to particles of the soil, and this interaction will be bigger how much bigger it will be to the faying surface. The ambient importance of the presence of PAHs in soil can be evaluated according to two perspectives: of impact to biota of the soil (micro and macroorganisms) and the potential superficial water contamination for the particle carry of the soil through rain, or processes of irrigation, until the sources. Currently, several environmental agencies, both nationally and internationally, recognize the dangerous potential of the presence of the “polyaromatics” distributed in the environment, due toxicological characteristics of these composites and for being highly recalcitrant. In Brazil one of the sources most important of PAHs, in some regions of low circulation of vehicles, it is the burning of the sugar cane. This culture is present in more than 70% of the arable land of the state of São Paulo and, therefore the extent of the impact of the sugar cane burning, is considerable, being of great importance the monitoring of these substances. In this work, was developed a method for the analysis of HPAs in soil, including solid-phase dispersion with alumina followed by elution with hexane:acetone (1:1) (v:v) and additional cleanup with Na2SO4:silica gel:alumina (1: 1: 2) (m:m). The extract was analyzed by HPLC/Fluorescence detection. The performance of this method was evaluated using ground samples with different texts of organic substance (11 to 36 g dm) strenghtened in three levels of concentration for the 16 HPAs considered with priority for the EPA. The accuracy of the method, evaluated by the recovery percentage, was better than 64% for all the analytes, except for anthracene, whose recovery ranged from 47 to 107%; while the precision ranged from 0.4 to 5.6%; evaluated by the RSD of the recoveries, effectuated in triplicate. The selectivity of the method was considered adequate for the absence of peaks of the witness sample in the times the retention of analytes. The limits of quantification (LQ) of the method were between 0.38 and 4.06 ng g for all the PAHs studied. xiv Generated by Foxit PDF Creator © Foxit Software http://www.foxitsoftware.com For evaluation only. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repositorio.unesp.br/bitstream/handle/11449/97800/fujita_ck_me_araiq.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
