Abstract
The present study evaluates biosorption efficiencies of pesticides atrazine, fluazifop-P-butyl, lactofen, lambda-cyhalothrin and chloropyrifos on corks of Quercus cerris and Quercus suber trees. The studies were carried out in batch and effects of pH (3, 7 and 9), temperature (10, 20, 30 and 40 °C), and time on adsorption were measured. Pesticide analyzes were performed with an Ion-trap Mass Spectrometer following the SANCO/10232/2006 EU extraction protocol for pesticides. The results show that the highest adsorption efficiency (80% and 70%) of the pesticides was found at pH 3, 30 °C and 360 minutes. The adsorption kinetics of pesticides followed pseudo-second order and pseudo-first order kinetics. The results obtained in this study show that Q. cerris and Q. suber corks can be used to develop efficient and economical cork-based alternatives for the treatment of environments contaminated with pesticides.
Highlights
In the last decades, the intensive use of pesticides has motivated controversial discussions on environmental issues of great relevance such as the quality of surface water and groundwater
For the present biosorption study the following pesticides were selected: atrazine, fluazifop-P-butyl, lactofen, lambda-cyhalothrin and chlorpyrifos, with a purity of 99% obtained from Sigma-Aldrich (Missouri, USA)
The pesticides atrazine, fluazifop-P-butyl, lactofen, lambda-cyhalothrin and chlorpyrifos pesticides were used, with a purity of 99% obtained from Sigma-Aldrich (Missouri, USA)
Summary
The intensive use of pesticides has motivated controversial discussions on environmental issues of great relevance such as the quality of surface water and groundwater. Pesticides can threaten sensitive species and cause dysfunctions in the reproductive capacity. They are a danger to humans by reaching the population through food and drinking water e.g. exposure to neurotoxic pesticides may increase the risk of Parkinson’s disease (Wang et al, 2011). Some pesticides are not toxic even at high concentration but they may show synergistic toxicity in the presence of other pesticides such as the case of atrazine and chloropyrifos (Belden and Lydy, 2000). European Union Directive 80/777/EEC sets the maximum allowable concentration of individual pesticides as 0.1 mg/L and total amount of pesticides as 0.5 mg/L in natural mineral water
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