THE APPLICATION OF FLOW-INJECTION IMINODIACETIC ACID ETHYLCELLULOSE MEMBRANE PRECONCENTRATION AND SEPARATION TECHNIQUE TO ATOMIC SPECTROMETRY

A flow injection-based on-line iminodiacetic acid-ethylcellulose (IDAE C) membrane preconcentration and separation technique was developed in the present work, which has the advantages of easy operation without membrane plugging problems; a high enrichment factor (more than 10 for most elements); a high sample throughput (30 samples h(-1)). The char acteristics of the IDAEC membrane were systematically studied, includi ng the effect of sample flow rate and analyte concentration on breakth rough point; dynamic capacity and the lifetime of the IDAEC membrane. The technique was successfully applied to Fond and seawater analysis i n which all elements studied are in ng ml(-1) level. The analytical pe rformance was verified with recovery of a standard addition from seawa ter. Satisfactory results were obtained. (C) 1998 Elsevier Science B.V . All rights reserved.