Colloque

Preconcentration and atomic absorption determination of silver as silver phenanthroline-tetraphenylborate

M. Satake

M.C. Mehra

Membre a labase

M. Satake

Résumé du colloque

The ion paired complex of silver with 1,10 phenanthroline and tetraphenylborate adsorbs quantitatively onto microcrystalline naphthalene over a wide pH range (1.5-11.0). Based on this, a new chromatographic flame atomic absorption method for trace silver has been developed. The chromatographic absorbent is synthesized in the laboratory that comprises of preabsorbed 1,10 phenanthroline and tetraphenylborate in appropriate proportions (1:1). A glass analytical column (60 m x 6 m) filled with the adsorbent is employed to separate 0.5-10 μg Ag+ from an aqueous sample at a flow rate of 1 mL/min. The entire adsorbed phase is taken up in 5 mL DMF and directly aspirated into flame for silver determination at 328.1 nm. Replicate analysis of 2 μg silver gave 0.140 absorbance and 1.2% relative standard deviation. The method offers a preconcentration factor of 200, while the calibration response is linear in 0.5-10 μg/5 mL DMF. Heavy metals at 10-100 ng (Cd, Co, Ni, Zn, Cr) and light metals at 100-500 ng (Na, K) do not cause any noticeable distortion of 2 μg silver signals. The method is sensitive and economical that requires less than 200 mg of adsorbent per determination.

Contexte

Section :

Chimie analytique et chimie minérale

Thème du colloque :

Chimie analytique et chimie minérale

Hôte : Université de Moncton

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