2012 |
Copaja, S; Bravo, H; Munoz, P Adsorption of Fungicides in Chilean Soils Incubated with Biosolids Artículo de revista Journal of the Chilean Chemical Society, 57 (2), pp. 1091-1094, 2012, ISSN: 0717-9707. Resumen | Enlaces | BibTeX | Etiquetas: biosolids, captan, degradation, desorption, dissolved fungicide, hplc, mobility, organic-matter, pesticides, sludge, soil, sorption, thiram thiram @article{RN55, title = {Adsorption of Fungicides in Chilean Soils Incubated with Biosolids}, author = { S. Copaja and H. Bravo and P. Munoz}, url = {/brokenurl#<Go to ISI>://WOS:000305169800006}, doi = {0.4067/S0717-97072012000200006}, issn = {0717-9707}, year = {2012}, date = {2012-01-01}, journal = {Journal of the Chilean Chemical Society}, volume = {57}, number = {2}, pages = {1091-1094}, abstract = {The efficiency of the adsorption process of the fungicides Captan and Thiram was studied in four Chilean soils from the VI [O'Higgins, (HGS)], VII [Talearehue, (THL)] VIII [Diguillin, (DIG)] and Metropolitan [Maipo, (MAO)] regions of Chile. Changes in the efficiency of adsorption when the natural soils were incubated with biosolids were analyzed., The values of parameters Kf and n from the Freundlich equation indicated an increase in the adsorption of fungicides incubated with biosolids (1% and 10%) with respect to natural soil. A high Kf value (12.1) for DIG-Thiram and a lower Kf value (4.3) for MAO-Captan interaction were observed for natural soils, while in soils incubated with biosolids (10%) the greatest value was (20.3) for DIG-Thiram and the lowest Kf value (10.2) for MAO-Captan. In general the high la values for Caplan and Thiram were correlated with organic carbon content in the natural and incubated soils, except for the interaction THL-Thiram, in which inorganic compounds of soils (clay) were dominant., The distribution constant between solid-liquid phases (Kd) increased in soils incubated with biosolids; the magnitude of this constant was more significant with Thiram. The same behavior was observed for the constant related to organic carbon constants (Koc)., The results of this work confirm that amending soils with biosolids is beneficial for immobilizing fungicides and helps prevent the percolation of Caplan and Thiram through the soil profile and into groundwater}, keywords = {biosolids, captan, degradation, desorption, dissolved fungicide, hplc, mobility, organic-matter, pesticides, sludge, soil, sorption, thiram thiram}, pubstate = {published}, tppubtype = {article} } The efficiency of the adsorption process of the fungicides Captan and Thiram was studied in four Chilean soils from the VI [O'Higgins, (HGS)], VII [Talearehue, (THL)] VIII [Diguillin, (DIG)] and Metropolitan [Maipo, (MAO)] regions of Chile. Changes in the efficiency of adsorption when the natural soils were incubated with biosolids were analyzed., The values of parameters Kf and n from the Freundlich equation indicated an increase in the adsorption of fungicides incubated with biosolids (1% and 10%) with respect to natural soil. A high Kf value (12.1) for DIG-Thiram and a lower Kf value (4.3) for MAO-Captan interaction were observed for natural soils, while in soils incubated with biosolids (10%) the greatest value was (20.3) for DIG-Thiram and the lowest Kf value (10.2) for MAO-Captan. In general the high la values for Caplan and Thiram were correlated with organic carbon content in the natural and incubated soils, except for the interaction THL-Thiram, in which inorganic compounds of soils (clay) were dominant., The distribution constant between solid-liquid phases (Kd) increased in soils incubated with biosolids; the magnitude of this constant was more significant with Thiram. The same behavior was observed for the constant related to organic carbon constants (Koc)., The results of this work confirm that amending soils with biosolids is beneficial for immobilizing fungicides and helps prevent the percolation of Caplan and Thiram through the soil profile and into groundwater |
Rivas, J; Toral, M I; Richter, P Sorption of Polybrominated Diphenyl Ethers in Biosolid Model Samples Artículo de revista Journal of the Chilean Chemical Society, 57 (2), pp. 1087-1090, 2012, ISSN: 0717-9707. Resumen | Enlaces | BibTeX | Etiquetas: biosolid brominated developmental exposure, extraction feed, fish flame low-dose matter, microextraction, model organic organic-matter, partition-coefficients, pbde-99, pbdes, phase polychlorinated-biphenyls, retardants, sample, sorption, thyroid-hormone @article{RN57, title = {Sorption of Polybrominated Diphenyl Ethers in Biosolid Model Samples}, author = { J. Rivas and M.I. Toral and P. Richter}, url = {/brokenurl#<Go to ISI>://WOS:000305169800005}, doi = {10.4067/S0717-97072012000200005}, issn = {0717-9707}, year = {2012}, date = {2012-01-01}, journal = {Journal of the Chilean Chemical Society}, volume = {57}, number = {2}, pages = {1087-1090}, abstract = {Biosolid model samples (BMSs) were developed to study the capacity of various matrixes to adsorb polybrominated diphenyl ethers (PBDEs) as a function of their composition. A commercial standard reference samples for biosolids containing a certified amount of PBDEs is currently not available for extraction evaluation. Therefore, this study will allow for the selection of an appropriate concentration of PBDEs to produce a reference material for analytes associated with the matrix., The sorption of PBDEs increased clearly concomitantly with the amount of organic matter present in the model, revealing that organic matter rather than the inorganic fraction is mainly responsible for the analyte-matrix interaction. Hydrophobic interactions are predominant in the retention of PBDEs in the biosolid matrix because more hydrophobic congeners are generally sorbed to a higher extent than those that are less hydrophobic., In order to know the probable PBDE sorption mechanism on the model sample of biosolid, the Gibbs free energies were calculated using the Freundlich model, giving values between -8 and -10 kJ/mol. These results suggest that the sorption mechanism of the PBDEs is through physiosorption. Therefore, the Freundlich model should be satisfactory for describing the analyte behavior.}, keywords = {biosolid brominated developmental exposure, extraction feed, fish flame low-dose matter, microextraction, model organic organic-matter, partition-coefficients, pbde-99, pbdes, phase polychlorinated-biphenyls, retardants, sample, sorption, thyroid-hormone}, pubstate = {published}, tppubtype = {article} } Biosolid model samples (BMSs) were developed to study the capacity of various matrixes to adsorb polybrominated diphenyl ethers (PBDEs) as a function of their composition. A commercial standard reference samples for biosolids containing a certified amount of PBDEs is currently not available for extraction evaluation. Therefore, this study will allow for the selection of an appropriate concentration of PBDEs to produce a reference material for analytes associated with the matrix., The sorption of PBDEs increased clearly concomitantly with the amount of organic matter present in the model, revealing that organic matter rather than the inorganic fraction is mainly responsible for the analyte-matrix interaction. Hydrophobic interactions are predominant in the retention of PBDEs in the biosolid matrix because more hydrophobic congeners are generally sorbed to a higher extent than those that are less hydrophobic., In order to know the probable PBDE sorption mechanism on the model sample of biosolid, the Gibbs free energies were calculated using the Freundlich model, giving values between -8 and -10 kJ/mol. These results suggest that the sorption mechanism of the PBDEs is through physiosorption. Therefore, the Freundlich model should be satisfactory for describing the analyte behavior. |
2012 |
Adsorption of Fungicides in Chilean Soils Incubated with Biosolids Artículo de revista Journal of the Chilean Chemical Society, 57 (2), pp. 1091-1094, 2012, ISSN: 0717-9707. |
Sorption of Polybrominated Diphenyl Ethers in Biosolid Model Samples Artículo de revista Journal of the Chilean Chemical Society, 57 (2), pp. 1087-1090, 2012, ISSN: 0717-9707. |