Artículos de revistas
Multivariate optimization of pressurized solvent extraction of alkylphenols and alkylphenol ethoxylates from biosolids
Fecha
2012Registro en:
Journal of the Brazilian Chemical Society, Volumen 23, Issue 2, 2012, Pages 267-272
01035053
16784790
10.1590/S0103-50532012000200011
Autor
Maricán, Adolfo
Ahumada, Inés
Richter Duk, Pablo
Institución
Resumen
In this study, a methodology for pressurized solvent extraction of alkylphenols (APs) and alkylphenol ethoxylates (APEOs) from biosolids was optimized by utilizing a biosolid natively containing these compounds at a high concentration level. Optimization of the extraction was carried out through a multivariate analysis experimental design with a central composite design (CCD) producing the following optimum values for the variables: temperature of 129 degrees C, extraction time per cycle of 34 min in two cycles and acetone as extraction solvent. Upon comparison with Soxhlet extraction, this methodology turned out to be more efficient for the extraction of APEOs and of similar efficiency for APs. On the other hand, the methodology is considerably faster than Soxhlet and uses a smaller amount of extraction solvent. Concentrations of 204 +/- 20 and 1053 +/- 23 mg kg(-1) for nonylphenol and nonylphenol-ethoxylate, respectively, were determined in the biosolid sample assayed.