Solid phase extraction of ultra traces silver(I) using octadecyl silica membrane disks modified by 1,3-bis(2-cyanobenzene) triazene (CBT) ligand prior to determination by flame atomic absorption.
A simple, reliable and rapid method for preconcentration and determination of the ultra trace amount of silver using octadecyl silica membrane disk modified by a recently synthesized triazene ligand, 1,3-bis(2-cyanobenzene)triazene (CBT), and flame atomic absorption spectrometry is presented. Various parameters including pH of aqueous solution, flow rates, the amount of ligand and the type of stripping solvents were optimized. The breakthrough volume was greater than 1800 ml with an enrichment factor of more than 360 and 6.0 ng l(-1) detection limit. The capacity of the membrane disks modified by 5mg of the ligand was found to be 1070 microg of silver. The effects of various cationic interferences on the percent recovery of silver ion were studied. The method was successfully applied to the determination of silver ion in different samples, especially determination of ultra trace amount of silver in the presence of large amount of lead.
Faculty of Chemistry, Tarbiat Moalem University, Tehran, Iran. rofouei@tmu.ac.ir
Mohammad Kazem
MK
Rofouei
Mahmood
M
Payehghadr
Mojtaba
M
Shamsipur
Asieh
A
Ahmadalinezhad
D006863:Hydrogen-Ion Concentration; D008024:Ligands; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014227:Triazines / Q000737:chemistry*
D008024:Ligands; D014227:Triazines; D012834:Silver; D012822:Silicon Dioxide