Preconcentration, Speciation and Determination of As and Sb by Optimized Experimental Design DLLME Combined with GF-AAS

چکیده مقاله

Determination of heavy metals is more important than past with the increasing their concentration in environment. Arsenic and Antimony have various forms in nature but only some forms of them are toxic. Speciation of them is impossible with common atomic absorption spectroscopy procedure. Dispersive liquid-liquid microextraction has been used for speciation includes complex formation with special ligands, extraction in organic phase and then determination with atomic absorption spectroscopy. Many factors effect on dispersive liquid- liquid microextraction procedure such as volume of disperser solvent, volume of extraction solvent, concentration of chelating agent, coexisting ions, time of extraction, pH, sample volume and salting out effect. All factors were optimized by experimental design and optimum values obtain for each other. Under the optimum condition the enrichment factor equal to 187 and detection limit 0.02 and 0.4 μgL-1 was obtained for Arsenic and Antimony respectively.