Multivariate Optimization of Pressurized Solvent Extraction of Alkylphenols and Alkylphenol Ethoxylates from Biosolids
نویسندگان
چکیده
Neste estudo, uma metodologia de extração em solvente pressurizado de alquilfenóis (APs) e alquilfenóis etoxilados (APEOs) a partir de biosólidos foi otimizada utilizando-se um biosólido contendo nativamente estes compostos em um nível de concentração elevada. A otimização da extração foi realizada através de um planejamento experimental de análise multivariada com um planejamento composto central (CCD) produzindo os seguintes valores otimizados: temperatura de 129 C, tempo de extração por ciclo de 34 min em dois ciclos e acetona como solvente de extração. Em comparação com a extração Soxhlet, esta metodologia acabou por ser mais eficiente para a extração de APEOs e de eficiência semelhante para a extração de APs. Por outro lado, a metodologia é consideravelmente mais rápida do que a de Soxhlet e usa uma pequena quantidade de solvente de extração. As concentrações de 204 ± 20 e 1053 ± 23 mg kg de nonilfenol e nonilfenol-etoxilato, respectivamente, foram determinadas na amostras de biosólido.
منابع مشابه
Quantitative determination of octylphenol , nonylphenol , alkylphenol 1 ethoxylates and alcohol ethoxylates by pressurized liquid extraction and 2 liquid chromatography - mass spectrometry in soils treated with sewage 3 sludges 4 5
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