Rotating coiled columns

The new scheme was applied to the flow-through (dynamic) fractionation of Zn, Cu, and Pb in soils using rotating coiled columns. The efficiency of leaching reagents and distribution of different HM forms in investigated samples were considered. 

THE POTENTIAL OF USING ROTATING COILED COLUMNS IN ANALYTICAL CHEMISTRY... 

Application of rotating coiled columns has become attractive for preparative-scale separations of various substances from different samples (natural products, food and environmental samples) due to advantages over traditional liquid-liquid extraction methods and other chromatographic techniques. The studies mainly made during the last fifteen years have shown that using rotating coiled columns is also promising for analytical chemistry, particularly for the extraction, separation and pre-concentration of substances to be determined (analytes) before their on-line or off-line analysis by different determination techniques. 

FIELDFLOW FRACTIONATION OF MICROPARTICLES USING ROTATING COILED COLUMNS... 

Recently it has been shown that rotating coiled columns (RCC) can be successfully applied to the dynamic (flow-through) fractionation of HM in soils and sediments [1]. Since the flow rate of the extracting reagents in the RCC equipment is very similar to the sampling rate that is used in the pneumatic nebulization in inductively coupled plasma atomic emission spectrometer (ICP-AES), on-line coupling of these devices without any additional system seems to be possible. 

Figure 12.1. Schematic representation of continuous-flow systems for dynamic fractionation (rt) rotating coiled column (RCC) (h) stirred flow-through cell, [(h) From Shiowatana et al., 2001b.]...

Figure 12.3. Leaching profiles of metals in SRM 2710 soil obtained by the application of extractants according to the original SM T three-step sequential extraction protocol using (a) a flow-through microcolumn-based system (column inner volume, 0.36 mL sample, 25 mg extraction flow rate, 3 mL min subfraction volume, 5 mL), and (b) a flow-through rotating coiled column-based system (column inner volume, 20 mL sample, 500 mg extraction flow rate, 1 mL min subfraction volume, 10 mL). [(a) From Chomchoei et al., 2005b) (h) from Fedotov et al., 2005b, by permission of the Royal Society of Chemistry.)...

Fedotov, P. S., Zavarzina, A. G., Spivakov, B. Ya., Wermrich, R., Mattusch, J., Titze, K de P. C., and Demin, V. V. (2002). Accelerated fractionation of heavy metals in contaminated soils and sediments using rotating coiled columns. J. Environ. Monit. 4, 318-324. 

Fedotov, P. S., Sutherland, I. A., Wood, P., and Spivakov, B. Ya. (2003). Retention of solids in rotating coiled columns the effect of beta value and tubing material. J. Liq. Chromatogr. Relat. Technol., 26, 1641-1649. 

Fedotov, P. S., Fitz, W. J., Wermrich, R., Morgenstem, P., and Wenzel, W. W. (2005a). Fractionation of arsenic in soil and sludge samples continuous-flow extraction using rotating coiled columns versus batch sequential extraction. Anal. Chim. Acta 538, 93-98. 

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