Automatic flow system for evaluation of polystyrene-divinylbenzene sorbents applied to preconcentration of phenolic pollutants

作者：Oliveira Hugo M; Segundo Marcela A^*; Lima Jose L F C

来源：International Journal of Environmental Analytical Chemistry, 2011, 91(9): 884-899.

DOI：10.1080/03067310903276316

• automation
• multisyringe flow injection analysis
• phenolic pollutants
• polystyrene-divinylbenzene
• solid-phase extraction

In this work, an evaluation of commercially available polystyrene-divinylbenzene sorbents for solid-phase extraction (SPE) of eleven phenolic compounds is intended. Considering the particle size and cross-linking degree, Amberlite XAD-4 (commercial or grounded), Macronet MN-200 and Lichrolut EN were tested. The SPE protocol was performed by an automatic system, providing repeatable experimental conditions for assessment of sorbent capacity, breakthrough volume and enrichment factor (EF). A positive correlation between EF and logK(ow) was found for Amberlite XAD-4 while a negative correlation was observed between EF and molecular weight of analyte for Macronet MN-200 and for Lichrolut EN. This indicates a prevalence of hydrophobic interactions or molecular exclusion depending upon the polymer cross-linking degree. Despite the similar repeatability (RSD < 4.7%, n > 6) and recovery values attained (97.6-102.7%, using 50mL of sample) for all sorbents, Lichrolut EN is the best choice for analytical application as higher EF and lower LOD values (between 18 and 207 ng) were attained for this sorbent.

• 出版日期2011