Bulletin of the Society of Sea Water Science, Japan

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A new chemically modified cellulose (Cell-NMG) with N-methyl glycin was prepared and used as a solid-phase extractant for the simultaneous extraction of trace Cu²⁺, Ni²⁺ and Co²⁺ prior to their determination by flame AAS. The Cell-NMG and metal-adsorbed Cell-NMG — metal were characterized by FT-IR and thermal analysis.
The effect of various parameters such as acidity, eluting solution, shaking time, flow rate, sample volume, interfering cations, etc., have been studied in detail. The quantitative adsorption for Cu²⁺ was at pH>4.8, for Ni²⁺ at pH>5.5 and for Co²⁺ at pH>6.1. For simultaneous enrichment of all the metal ions on the adsorbent, a pH value on about 6.5 was selected. The retention of the metal ions on the adsorbent was not influenced by the sample flow-rate within the studied range of 5∼25 mL/min. A flow rate of 15 mL/min was selected for adsorption, and the retained metal ions on the microcolumn (polypropyrene syringe, 78×15 mm i.d., 1.0 g of Cell-N-MG was packed) were eluted with 10 mL of 1.0 mol/L HCl solution at a flow rate of 7 mL/min. The maximum sorption capacities were found to be 0.38 mmol/g for Cu²⁺, 0.27 mmol/g for Ni²⁺ and 0.25 mmol/g for Co²⁺. This method has been successfully applied to study the recovery of the metal ions in spiked ground water, river water and cooking salt samples.

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