Selective cloud point extraction and graphite furnace atomic absorption spectrometric determination of molybdenum (VI) ion in seawater samples

摘要: Abstract A cloud point extraction process using the nonionic surfactant Triton X-114 to extract molybdenum from aqueous solutions was investigated. The method is based on complexation reaction of Mo(VI) with 1,2,5,8-tetrahydroxyanthracene-9,10-dione (quinalizarine: QA) and micelle-mediated complex. enriched analyte in surfactant-rich phase determined by graphite furnace atomic absorption spectrometry (GFAAS). optimal conditions (e.g. pH, reagent concentrations, temperature, incubation centrifugation times) were evaluated optimized. Under optimized experimental conditions, limit detection (LOD) for 7.0 ng L −1 an preconcentration factor ∼25 when 10 mL sample solution preconcentrated 0.4 mL. proposed (with extraction) showed linear calibration within range 0.03–0.6 μg L . relative standard deviation (RSD) found be 3.7% ( C  = 0.05 μg L , n  = 5) pure solutions, whereas RSD recoveries real samples ranged between 2 8% (mean RSD = 3.9%). applied determination seawater tap water a recovery spiked 98–103%. interference effect some cations anions also studied. In presence foreign ions, no significant observed. order verify accuracy method, certified reference analysed results obtained good agreement values.