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Sample handling of complex samples such as plant materials is a challenge because of the presence of organic matrix compounds that may interfere with the selective extraction. The approach presented here involves the use of a membrane to physically separate the selective sorbent from the original sample. Thus, matrix components can be prevented from reaching the sorbent and the operation can be performed before the concentration step, thereby saving time. Examples of this approach will illustrate its effectiveness., Sample handling of complex samples such as plant materials, sludge, and sediments remains a challenge because of the multitude of organic matrix components that are present. Most of these interfering [...]

Membrane techniques have been used in many analytical applications and processes such as the selective removal and concentration of cations in solution, selective separation of gases and organic compounds in [...]

The form and bioavailable fractions of the metal ion are important factors that must be known in exposure risk assessment of any ecosystem. Supported liquid membrane extraction is capable of [...]

A coupled-column system, consisting of a combination of a molecularly imprinted polymer (MIP) and a [C.sub.18]-silica column, was used for selective triazine detection in the HPLC mode. Complex aqueous samples, spiked with triazines, were selectively extracted by the MIP followed by subsequent identification by analytical reversed-phase chromatography. The MIP showed good performance for selectively discriminating triazines from humic acid, whereas urine and apple extract had some tendency to be retained by the MIP. Enrichment was observed in all cases, and triazine-enrichment factors of up to 100 could be recorded, with good extraction efficiency (74-77%). The results indicate that the high selectivity of MIPs can be favorably used for selective sample enrichment in conjunction with reversed-phase HPLC.