title: Separation, preconcentration and determination of silver ion from water samples using silica gel modified with 2,4,6-trimorpholino-1,3,5-triazin.
abstract: A new modified silica gel using 2,4,6-trimorpholino-1,3,5-triazin was used for separation, preconcentration and determination of silver ion in natural water by atomic absorption spectrometry (AAS). This new bonded silica gel was used as an effective sorbent for the solid-phase extraction (SPE) of silver ion from aqueous solutions. Experimental conditions for effective adsorption of trace levels of silver ion were optimized with respect to different experimental parameters in column process. Common coexisting ions did not interfere with the separation and determination of silver at pH 3.5 so that silver ion completely adsorbed on the column. The preconcentration factor is 130 (1 mL elution volume for a 130 mL sample volume). The relative standard deviation (R.S.D.) under optimum conditions is 3.03% (n=5). The accuracy of the method was estimated by using spring and tap water samples that were spiked with different amounts of silver ion. The adsorption isotherm of silver ion was obtained. The capacity of the sorbent at optimum conditions has been found to be 384 microg of silver per gram of sorbent.
authors.affiliation: Department of Chemistry, Faculty of Science, Bu-Ali Sina University, Hamadan 65174, Iran. madrakian@basu.ac.ir
authors.forename: Tayyebeh
authors.initials: T
authors.lastname: Madrakian
authors.forename: Abbas
authors.initials: A
authors.lastname: Afkhami
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Zolfigol
authors.forename: Mohammad
authors.initials: M
authors.lastname: Solgi
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry / Q000302:isolation & purification*; D013885:Thiosulfates / Q000737:chemistry; D014227:Triazines / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D013885:Thiosulfates; D014227:Triazines; D014874:Water Pollutants, Chemical; D012834:Silver; D058428:Silica Gel; D012822:Silicon Dioxide; C042124:potassium thiosulfate