Solvent-assisted dispersive solid phase extraction.

摘要: In this research, a novel extraction technique termed solvent-assisted dispersive solid phase (SADSPE) was developed for the first time. The new method based on dispersion of sorbent into sample to maximize contact surface. method, at very low milligram level achieved by injecting solution aqueous sample. Thereby, cloudy formed. state resulted from fine particles in bulk After extraction, separation performed centrifugation and enriched analyte sedimented could be determined instrumental methods. performance SADSPE illustrated with determination trace amounts cobalt(II) as test food environmental water samples using flame atomic absorption spectrometry detection. Some key parameters SADSPE, such selection amount, type volume solvent, pH, chelating agent concentration, salt were investigated. Under most favorable conditions, good limit detection (as 0.2 µg L(-1)) repeatability (RSD below 2.2%, n=10) obtained. accuracy tested standard reference material (SRM-1643e SRM-1640a) spiked addition. advantages are simplicity operation, rapidity, cost, high recovery, enrichment factor.