Anal. Chem. 1987, 59, 1850-1852
1850
Selective Preconcentration of Iron in Beverages and Water Samples Using 2,4,6-Tri-2-pyridinyl- 1,3,5-triazineTetraphenylborate-Naphthalene Adsorbent Bal K r i s h a n P u r i Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India Masatada Satake* and Gentaro Kano Faculty of Engineering, Fukui University, Fukui 910, J a p a n S h i r o Usami Department of Industrial Chemistry, Faculty of Engineering, Toyama University, Toyama 930, J a p a n
A solid Ion palr material produced from 2,4,6-tri-2-pyrldlnyi1,3,5-trlazlne-tetraphenylborate on naphthalene provides a very simple, rapld, and economical method for the preconcentratlon of Iron from large volumes of whlsky, beer, and natural water samples. Iron Is quantitatively retained on thls adsorbent in the pH range 3.3-7.0 and at a flow rate of 1-8 mL/mln. The soild mass conslstlng of the metal complex along wlth naphthalene is dlssolved from the column with 5 mL of dimethylformamide (DMF). The absorbance is measured at 597 nm with a spectrophotometer agalnst the reagent blank. Beer's law Is obeyed over the concentratlon range 0.2-8.0 pg of iron In 5 mL of the final DMF solutlon. The molar absorpthrlty is 2.39 X lo4 L m0l-l cm-l. Eight repllcate determinations of a sample solution containing 5 pg of Iron gave a mean absorbance of 0.430 with a relatlve standard deviation of 0.79 %. The Interference of various ions has been studied and the method has been employed to the determinatlon of iron in standard reference material, wine, beer, whisky, brandy, tomato julce, mlxed vegetable julce, and natural water samples.
(TPTZ)-tetraphenylborate (TPB)-naphthalene as an adsorbent. This adsorbent can be prepared simply by mixing the acetone solutions of the reagents in water. The adsorbed metal in the column is not eluted, even after washing with water, but can be dissolved easily with a small volume (
