Kusaka Y, Tsuji H, Imai S, Ohmori S
Radioisotopes. 1979 Mar;28(3):139-44. doi: 10.3769/radioisotopes.28.3_139.
Analytical values of trace elements in sea water samples have been fluctuated according to the sampling locations, the analytical procedures and so on. It is very important in marine chemistry to elucidate the cause of such concentration variations. This report is the analytical results of the samples obtained in the Pacific Ocean, the Indian Ocean and the Sea of Japan, by means of neutron activation analysis. As the preconcentration, APDC-chelate extraction and freeze-drying were adopted. The specimens obtained by this extraction from 500 or 800 ml samples were irradiated by KUR reactor for 1 min, 1 hr to 10 hrs and the gamma-ray spectrometry with a Ge(Li) detector was used for the determination of V, Mn, Cu, Zn, U, Fe, Co, Ni, Ag, Sb and Au. By about 80 hrs irradiation of the specimens obtained by freeze-drying from 20 ml samples and their gamma-ray spectrometry, Sc, Cr, Fe, Co, Zn, Rb, Sr, Ag, Sb and Cs were determined. The former procedure gives concentrations of elements in species reactable with APDC, but the latter method shows entire concentrations of the elements in the sea water samples. Some considerations on the analytical values and the comparisons of the both methods are described.
海水样本中微量元素的分析值会因采样地点、分析程序等因素而波动。阐明这种浓度变化的原因在海洋化学中非常重要。本报告是通过中子活化分析对在太平洋、印度洋和日本海采集的样本进行分析的结果。作为预浓缩方法，采用了APDC螯合萃取和冷冻干燥。从500或800毫升样本中通过这种萃取获得的标本用KUR反应堆辐照1分钟、1小时至10小时，并使用带有锗锂探测器的伽马射线光谱法测定钒、锰、铜、锌、铀、铁、钴、镍、银、锑和金。通过对从20毫升样本冷冻干燥获得的标本进行约80小时的辐照及其伽马射线光谱分析，测定了钪、铬、铁、钴、锌、铷、锶、银、锑和铯。前一种方法给出了与APDC反应的物种中元素的浓度，但后一种方法显示了海水样本中元素的总浓度。文中描述了对分析值的一些思考以及两种方法的比较。
