Membrane-enclosed sorptive coating

Vrana, B., P. Popp, A. Paschke, and G. Schuurmann. 2001. Membrane-enclosed sorptive coating. An integrative passive sampler for monitoring organic contaminants in water. Anal. Chem. 73 5191-5200. 

Vrana, B., A. Paschke, and P. Popp. 2006. Calibration and field performance of membrane-enclosed sorptive coating for integrative passive sampling of persistent organic pollutants in water. Environ. Pollut. 144 296-307. 

Paschke, A., B. Vrana, P. Popp, L. Wennrich, H. Paschke, and G. Schtiurmann. 2007. Membrane enclosed sorptive coating for the monitoring of organic compounds in water. In R. Greenwood, G.A. Mills, and B. Vrana (eds), Passive Sampling Techniques in Environmental Monitoring, pp. 231-249. Amsterdam Elsevier. 

A passive sampling device was constructed using the commercially available Twister sorbent stir bar by enclosing it inside a dialysis membrane. This device has been called a membrane-enclosed sorptive coating sampler or MESCO. Extraction efficiencies were three orders of magnitude lower than for SPMD due a lower sampling rate, however, the sensitivity was comparable because all of the collected analyte is desorbed into the GC whereas in SPMD, only a small sample in injected for analysis. Twister stir bars are also much smaller and can be deployed less conspicuously. 

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