Artículos de revistas
Extraction and pre-concentration of volatile organic compounds by membrane permeation for chromatography analysis.
Quimica Nova. Soc Brasileira Quimica, v. 23, n. 1, n. 94, n. 97, 2000.
da Rocha, EC
This work discusses sample preparation processes for gas chromatography (GC) based on the technique of extraction through membrane permeation (MPE). The MPE technique may be easily coupled to GC via a relatively simple device, which is a module that holds the membrane and is directly connected to the GC column. The possibility of operational errors due to sample handling is substantially reduced in an MPE-GC system because the sample preparation and the chemical analysis are accomplished as a one-step process. The MPE technique is of relatively wide application as it can he used for aqueous samples, solid samples and gaseous samples. Depending on the type of sample the extraction is performed with the membrane in direct contact with the sample or in contact with its headspace, The MPE-GC technique is very useful in trace analysis, due to the time-dependent enrichment of the analyte, A typical application of MPE-GC is the analysis of VOCs present in water that may be accomplished with detection limits at the low ppb (mu gL(-1)) level.2319497