Determination of trace elements in marine organisms part 1 factors for variation of concentration of trace elements
Ishii, T.; Suzuki, H.; Koyanagi, T.
Nippon Suisan Gakkaishi 44(2): 155-162
As one part of a radioecological study on the marine environment, the concentrations of stable isotopes such as Mn, Fe, Co, Ni, Cu, Zn, Rb and Cs in marine organisms were determined by atomic absorption spectroscopy and neutron activation analysis, and the environmental and biological factors controlling the concentrations of stable elements were examined. Only small differences in concentration were observed among the species of marine fishes, but marine invertebrate and algae showed species specificity. For the Fe family elements, different concentration factors were obtained. Values in the muscles of marine fishes were in the range of 103 for Fe, 9 .times. 10 for Co and 10 for Ni. A regional variation was found for Cu and Zn, whose highest values were observed in the samples collected at the seashore of Mizuki in Ibaraki prefecture [Japan]. The distribution of trace elements in each algal body was not homogeneous; for almost all trace elements the concentrations tended to increase with the distance from the growing tip. Trace elements for lamina in the organs of Sargassum showed the highest values, where Fe in particular was concentrated 20 .times. as much as in the receptable. Little variation with growth of marine algae was observed in the case of trace elements other than Fe; the Fe concentration tended to decrease with growth. Seasonal variation was observed for Fe, Co and Zn in Sargassum. These elements reached their highest values in March, and thereafter decreased gradually; Mn and alkali metals did not show any apparent seasonal variation.