عنوان مقاله [English]
Sulfur nanoparticles were synthesized via W/O microemulsion method. A comparison study was performed between synthesized sulfur nanoparticles and sulfur micro particles for extraction and preconcentration of nickel ions from different water samples prior to determination by FAAS. The effects of the analytical parameters including pH of the sample solution, sample matrix, eluting solution conditions, flow rate of sample solution, sample volume and interfering ions were investigated for each adsorbent and the optimum values were obtained. The effect of the size of sulfur adsorbent on the extraction efficiency was evaluated. Under the optimum experimental conditions, preconcentration factor, analytical detection limit, adsorption capacity, reusability of the sorbent and flow rate of sample solution were obtained for sulfur microparticles as100, 0.00180 µg/mL, 15.75µg/g, maximum 10 cycles and 1 ml/min respectively. Whether, using sulfur nano particles these amounts were obtained as 166.67, 0.00108 µg/ml, 30.08 µg/g, >70 cycles and 5 ml/min, respectively. These results showed that, sulfur nano particles adsorbent will cause to higher preconcentration factor, lower detection limit, higher adsorption capacity, more reusability of the sorbent and faster extraction of the analyte.The proposed method was applied for determination of nickel ions in tap, river and spring water samples using each of these adsorbents.