Techniques and analytical methods in the determination of uranium, thorium, plutonium, americium and radium by adsorption on manganese dioxide

Uranium Sorption on Sodium Aluminosilicates and Gibbsite

“…17,18,19,20 At high pH, the surfaces of most solids are negatively charged and likely to sorb cationic species, such as Sr 2+ . Under these solution conditions most actinides such as U(VI) exist as negatively charged hydrolysis and carbonate (CO 3 2-) species [such as (UO 2 ) 2 (OH) 5 -and UO 2 (CO 3 ) 3…”

Pre-concentration of naturally occurring radionuclides and the determination of 212Pb from fresh waters

“…Uptake was above 90% for lead and above 80% for bismuth at pH 2e14 (Fig. 2) as these elements are not subject to hydrolysis and complex formation with pH variations (Crespo et al, 1993). High lead uptake also occurred due to the oxidisation of Pb(II) to Pb(IV) in the MnO 2 column, and following the formation of multi-nuclear surface complexes (Murray and Dillard, 1979) and structural incorporation (Manceau et al, 1992).…”

“…A novel manganese dioxide (MnO 2 ) resin offers potential for short-lived 212 Pb pre-concentration, as water samples may be passed through the media at relatively high flow rates of 100 ml min À1 (Burnett, 2007). The resin is based on the pre-filter material (Eichrom Industries, USA), and the MnO 2 loaded extracts many elements with high efficiency, including lead, uranium, thorium and radium (Jenne, 1968;Moore, 1976;Crespo et al, 1993;Tonkin et al, 2004). Although other structural forms of MnO 2 exist (e.g.…”

Synthesis and trace metal characterization of potassium plutonium sulphate: working reference material for plutonium

“…Several analytical approaches have been documented for determination of plutonium in various concentrations and in various complex matrices [13][14][15][16]. Several reports are also available in the literature for the determination of various elements in different kinds of plutonium matrices [17][18][19][20].…”