Abstract
Determination of trace element concentrations in marine samples is of considerable interest in studying diverse types of oceanic pollution sources, mode of transport and residence times of pollutants in seawater, and in revealing interactions that may exist among elements in suspended particulate and soluble fractions of seawater. Neutron activation analysis (NAA) methods are being investigated in this laboratory for measuring multi-element concentrations of oceanic suspended particulate matter (SPM) and seawater. An instrumental NAA (INAA) method has been developed for determining Al, Au, Ba, Br, Ca, Ce, Cl, Co, Cr, Eu, Fe, Hf, Hg, I, K, La, Lu, Mg, Mn, Na, Nd, Rb, Sb, Sc, Se, Sm, Sr, Th, Ti, V and Zn in microgram quantities of oceanic SPM. The method consists of three sequential irradiations at two different neutron fluxes and subsequent counting after five decay periods using high-resolution detectors. The method for determining trace elements in seawater involves preirradiation separations of Br and Cl using nitric acid and hydrogen peroxide and of Na with hydrated antimony pentoxide. Concentrations of Ag, Ca, Co, Cr, Fe, La, Lu, Mn, Mo, Sm, Sr, Ti, V and Zn in seawater have been measured. Details of analytical methodologies for determining trace elements in both suspended particulate and soluble fractions of seawater are presented.
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