Silica sequentially modified with polyhexamethylene guanidine and Arsenazo I for preconcentration and ICP–OES determination of metals in natural waters

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