|Budget Amount *help
¥2,100,000 (Direct Cost : ¥2,100,000)
Fiscal Year 1991 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1990 : ¥1,300,000 (Direct Cost : ¥1,300,000)
We have analyzed the samples of particles existing in the atmosphere, in the water column, and in the deep-sea sediments by using the Scanning Electric Microscope (SEM), Energy Dispersive X-ray Spectrometry (EDS), and Automated Individual Feature Analyzer.
We summarized as follows :
(1) Atmospheric aerosols were collected by a step sampler which can sample automatically with certain time interval. We obtained the suitable flow rate of 1 -1/min for this equipment. We also collected aerosol samples by high volume air samplers in Sapporo and Vladivostok, CIS for two years during 1990-1992. The series of 24-hours sample was obtained during the period from April to May, 1991
(2) Deep-sea sediment core samples were obtained from the basin of the Japan Sea (water depth 3600m) during the two cruises in 1990 and 1991. At the same time, we attempt to collect suspended particles in near bottom seawater.
(3) After carbon coating treatment, particle samples were analyzed for their features and chemical
components by the SEM and EDS system. We obtained that the precision of elemental analysis by this system was within 10% for 10 major elements calibrated by the standard glasses and rocks.
(4) From the analysis of feature and elemental analysis, atmospheric aerosols can be categorized with several groups which are enriched with SI-AI, Si, Fe and some trace elements. The particle size tends to be larger during the day time, and to be smaller during the night.
(5) From the analysis of deep-sea sediments, the waddel diameter of 3mum was obtained from the 300 individual particle analysis. There still remain the problems that how to calculate the size of needle or irregular shape particles.
(6) From the analysis of pollution components for aerosols, fine particles from anthropogenic sources are transported several hundreds kilometers. Transport pass of these particles is very similar to that of mineral aerosols which is related to Kosa phenomena.
(7) The deep-sea sediment cores were cut with a several millimeter thickness, then analyzed with the SEM and the EDS. The peaks of Fe and Mn concentrations were observed at different depth which was not able to separate with the common methods. Less