title: The use of Bacillus subtilis immobilized on Amberlite XAD-4 as a new biosorbent in trace metal determination.
abstract: The present work proposes the use of Bacillus subtilis immobilized on Amberlite XAD-4 as new biosorbent in trace metal determination. The procedure is based on the biosorption of Cu and Cd ions on a column of Amberlite XAD-4 resin loaded with dried, dead bacterial components prior to their determination by flame AAS. Various parameters such as pH, amount of adsorbent, eluent type and volume, flow rate of solution and matrix interference effect on the retention of the metal ions have been studied. The optimum pH values of quantitative sorption for Cu and Cd were found to be 7.0 and 7.5, respectively. These metal ions can be desorbed with 1M HCl (recovery, 96-100%). The sorption capacity of the resin was 0.0297 and 0.035 mmol g(-1) for Cu(2+) and Cd(2+), respectively. The tolerance limit of some electrolytes were also studied. This procedure was applied to Cu(2+) and Cd(2+) determination in aqueous solutions, including river and well water systems. In order to evaluate the accuracy of the proposed procedure, the certified reference materials, NRCC-SLRS-4 Riverine water and LGC7162 Strawberry leaves were analyzed.
authors.affiliation: Dicle University, Faculty of Science, Chemistry Department, 21280 Diyarbakir, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Dogru
authors.forename: Reyhan
authors.initials: R
authors.lastname: Gul-Guven
authors.forename: Sait
authors.initials: S
authors.lastname: Erdogan
mesh_terms: D000327:Adsorption; D001412:Bacillus subtilis; D002104:Cadmium / Q000032:analysis* / Q000737:chemistry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry; D052616:Solid Phase Extraction; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D014881:Water Supply / Q000032:analysis
chemical_list: D007475:Ion Exchange Resins; D011137:Polystyrenes; D011145:Polyvinyls; D014874:Water Pollutants, Chemical; D002104:Cadmium; C012101:XAD-4 resin; D003300:Copper