Abstract
Polymetallic nodule samples from the Central Indian Basin were analysed using energy-dispersive x-ray fluorescence employing the fundamental parameter approach. Photons of 5.96 and 22.6 keV, from radioactive sources of 55Fe and 109Cd, respectively, were used for exciting the samples. Fifteen elements, namely Si, Cl, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, Sr, Y, Zr, Mo and Pb, were quantified. The samples were diluted in cellulose nitrate powder to reduce the enhancement and absorption effects due to the unknown matrix. The experimental procedures adopted for elemental analysis were checked by analysing a NIST certified reference material (SRM 2710) and a polymetallic nodule standard reference material (NIO-2388). The measured concentrations of various elements present in the nodule samples were compared with those reported earlier using ICP-AES and ICP-MS. © 1998 John Wiley & Sons, Ltd.
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