Flotation separation and electrothermal atomic absorption spectrometric determination of lead in water samples

摘要: A flotation method based on formation of an ion–associate complex between ferroin and Pb(II)–thiosulfate is proposed for the quantitative separation preconcentration Pb(II) content in water some vegetable samples. The process was carried out using a 250-mL aliquot aqueous solution at buffering pH 8.50. After separating complex, it dissolved 5 mL heated 1 M HNO3, determined by electrothermal atomic absorption spectrometry. determination range 1.6 × 10−9 to 1.2 10−8 M. limit detection relative standard deviation were obtained as 8.5 10−10 1.73%, respectively. It found that large number cations anions, even high much foreign ion/Pb(II) ratios, not interfered. validity confirmed determining contents two Standard Reference Materials synthetic liquid extract sample. then a...