Nagatsuka S, Tanizaki Y, Yamazaki M
Radioisotopes. 1982 Feb;31(2):69-73.
The instrumental neutron activation analysis was applied to the multielemental analysis of the freshwater diatoms taken from the head and lower areas of Tama river. Dry samples of the diatoms were irradiated for 1 minute (for the measurement of short lived nuclides) by pneumatic tube of TRIGA-II reactor of Musashi Institute of Technology, and 12 hours (for the measurement of long lives nuclides) in F ring of TRIGA-II reactor of Rikkyo University. The analytical results of 20 elements in the samples were obtained, and the concentration of Ti showed high values in all the samples. Since it is considered that Ti is absent in algae, these high values indicate that appreciable amounts of river sediment were contained in the samples. Therefore, the analytical results were corrected for Ti contents in the samples. The concentrations of Mg, K, Zn, Mn and Co in the diatoms showed no difference between the two sampling points. The concentrations of Cr, V, As and Sb in the diatoms, however, showed difference between the two sampling points, depending on the river water quality. In Stenopsyche grisepennis, on the other hand, the concentrations of Mn and Co depend on the river water quality, and the concentrations of Cr depend on the amount of diatoms staying in the body. The concentrations of V, As and Sb in the Stenopsyche griseipennis are considered to depend both on the amount of diatoms and river sediment staying in the body.
采用仪器中子活化分析法对取自多摩河上游和下游区域的淡水硅藻进行多元素分析。硅藻干样通过武藏工业大学TRIGA-II反应堆的气动管道辐照1分钟（用于测量短寿命核素），并在立教大学TRIGA-II反应堆的F环中辐照12小时（用于测量长寿命核素）。获得了样品中20种元素的分析结果，所有样品中钛的浓度都很高。由于藻类中一般认为不存在钛，这些高值表明样品中含有相当数量的河流沉积物。因此，对分析结果进行了样品中钛含量的校正。硅藻中镁、钾、锌、锰和钴的浓度在两个采样点之间没有差异。然而，硅藻中铬、钒、砷和锑的浓度在两个采样点之间存在差异，这取决于河水水质。另一方面，在灰纹石蛾中，锰和钴的浓度取决于河水水质，铬的浓度取决于体内留存的硅藻数量。灰纹石蛾中钒、砷和锑的浓度被认为既取决于体内留存的硅藻数量，也取决于河流沉积物的数量。
