Degradación fotolítica del carbofurano en aguas del río Ríonegro y en agua ultrapura bajo diferentes condiciones de pH
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Date
2015-03-06
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Área Metropolitana del Valle de Aburrá
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. The use of pesticides in agriculture has generated important impacts: on one side, the increase of
agricultural production and, on the other, a big source of environmental pollution. This fact has brought the consciousness of the importance of studying the dynamics of such pollutants in the environment and the possible
alternatives to degrade them. Objective. To study the carbolysis of carbofuran in waters confluent to the crops
from the East of Antioquia, by the use of a sun radiation simulator, toxicity tests and determination through liquid
chromatography -with an ultra-violet detector with a diode array-.materials and methods. To establish the
best photolytic degradation conditions a 3x2x2 factorial design was used, evaluating three variables: pH (5, 7
and 9), types of water (ultra-pure and surface water) and carbofuran concentration. The response factor defined
was de degradation percentage. Results. As pH increases the carbofuran´s degradation percentage is more
significant, with 30% and 20% of degradation at a pH of 9 during 90 minutes of irradiation in ultra-pure water
and surface water, respectively. It can also be seen that under natural pH conditions –represented by water from
the Ríonegro river- the removal percentages of a 10 mg L-1 and 30 mg L-1
samples, when irradiated, 9,5% and
21% of degradation are respectively obtained, which means that with low carbofuran concentrations the effect
of neutral pH tends to have a lower influence on the degradation. Conclusions. The photolytic processes as
primary degradation mechanisms in the environment have a significant contribution to the degradation of carbofuran when this carbofuran is at relatively high concentration rates. For the Rio Negro river waters, neither the
dissolved organic matter nor a neutral pH value, had an effect on the carbofuran´s degradation. Nevertheless,
basic or acid pH values tend to increase the degradation of the carbofuran.
Description
Keywords
Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Contaminación del agua, Pesticidas, Oriente Antioqueño, Contaminación ambiental, Contaminación agrícola, Río Negro (Antioquia)