Article ID Journal Published Year Pages File Type
1227644 Microchemical Journal 2015 6 Pages PDF
Abstract

•A new sorbent based on sequentially modified silica with polyhexamethylene guanidine and Arsenazo I has been prepared.•A procedure for sorption-ICP–OES determination of metal ions in natural waters is proposed.•LOD of the method is 0.03–0.44 μg/L.

Silica based sorbent sequentially modified with polyhexamethylene guanidine and 2-(1,8-dihydroxy-3,6-disulfo-2-naphthylazo)benzenearsonic acid (Arsenazo I) was developed and studied in the present work. Conditions for immobilizing Arsenazo I on the aminated silica surface were studied: optimal equilibration time was 10 min, and a maximum reagent extraction was achieved between pHs 4 and 7. The stability of the sorbent in highly saline and weakly acidic solutions was examined: it was found that the reagent had not been desorbed from the surface by treatment with dilute solutions of HNO3 and NaCl solutions up to a concentration of 10 g/L. Maximum recovery of Al(III), Ca(II), Cd(II), Co(II), Cu(II), Fe(II), Fe(III), Mg(II), Ni(II), Pb(II), and Sr(II) was observed in the pH range of 5–7. Metals were desorbed from the surface with 1 M HNO3. Sorption-inductively coupled plasma optical emission method for the determination of metal ions had been developed, including group sorption preconcentration of metal ions from aqueous solutions at pH 7 in the hydrocarbonate buffer medium, their desorption with 1 M HNO3, and inductively coupled plasma optical emission determination. The proposed method was used to determine metal concentration in river waters of Krasnoyarsk Krai.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
Authors
, , , ,