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Volume 18 (1984)
- Issue 2 Pages 45-
- Issue 1 Pages 1-
Volume 18, Issue 1
Displaying 1-5 of 5 articles from this issue
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Original Papers
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Yoshimitsu HIRAO, Masayuki KOSHIKAWA, Miyuki HONDA, Kazuo SHIMA, Keiko ...1984 Volume 18 Issue 1 Pages 1-13
Published: August 25, 1984
Released on J-STAGE: November 24, 2016
JOURNAL FREE ACCESSThe behavior of pollutant lead in a river is discussed. The River Tamagawa which flows through Tokyo Metropolitan district in the lower stream was selected for this study. The lead concentration of the river water increased from 20 at the river head to 500 ng/kg at the middle and then increased to 2400 ng/kg at the lower stream. Although natural level of lead concentration in the lower stream is estimated to be around 200 ng/kg, the observed value is about 10 times as high as the value owing to nonnatural origin. Sediments showed the similar increasing pattern of lead to the water from 11 to 81 μg/g. The patterns are relative to the cumulative population in the drainage basin of the river, so that the introduction of pollutant lead by human activities is suggested. It seems that main source of pollutant lead is not conclusively attributed to automobiles from the consumption of lead alkyls in Japan in 1980. Suspended substance contained 30-60% of total lead in water at the normal flow. During the flood more than 95% of lead was carried out by particulate matter but the amounts of lead in the dissolved state remained rather constant. Approximately 80% of lead in sediments was considered to be contained in hydroxides of iron and others and organic matter.View full abstractDownload PDF (1150K) -
Tou-ichi ITOYAMA1984 Volume 18 Issue 1 Pages 15-19
Published: August 25, 1984
Released on J-STAGE: November 24, 2016
JOURNAL FREE ACCESSGroundwater samples were collected from three drilled wells situated in a forest area, after ordinary and heavy precipitation events. Two patterns of concentration change of dissolved species were observed after ordinary precipitation event. One, examplified by the behavior of Ca2+ and alkalinity, represents a simple dilution of ground-water by penetrating rainwater. The other, characteristic of NO3- and silica, indicates a temporary increase in concentrations of these species. The nitrate was derived from dissolution of dry fallout, and the silica from dissolution of amorphous aluminosilicates formed by weathering of silicate rocks. After a heavy precipitation, the pattern of concentration change can be explained by a strong dilution of groundwater by rainwater. Only silica concentration remained virtually unchanged, thus supporting leaching of silica from aluminosilicates by descending rainwater.View full abstractDownload PDF (404K) -
Bromide ion concentration and Br/Cl ratio of ground water in the southwest region of Gifu PrefectureHiroshi TERAO, Masakatsu KAJIKAWA, Yuki MORISHITA, Kikuo KATO1984 Volume 18 Issue 1 Pages 21-28
Published: August 25, 1984
Released on J-STAGE: November 24, 2016
JOURNAL FREE ACCESSBromide ion concentration and Br/Cl ratio in the ground waters reported in few articles were measured. Water samples were collected from the two areas, confined and unconfined ground water areas, in the southwest region of Gifu Prefecture located in the central Japan. Bromide ion concentrations of 24 confined and 38 unconfined ground water samples ranged from 8 to 229 μg/l (except one hot spring water, 22 mg/l) and from 20 to 625 μg/l, respectively. An extent of Br/Cl ratio of the confined ground water samples including one hot spring water was from 3.1x10-3 to 4.8x10-3 (mean value, 4.0x10-3). This ratio did not vary with chloride ion concentration and was almost equal to that of sea water. On the other hand, Br/Cl ratio of the unconfined ground water showed the wide range from 3.5 × 10-3 to 35.5 x 10-3 and, except a few, seemed to be raised with an increase in chloride, nitrate, and sulfate ion concentrations. The unconfined ground water area was considered to be polluted by fertilizer and pesticide. It was considered that bromide ion decomposed from the pesticide containing 1, 2-dibromoethane was mixed into ground water.View full abstractDownload PDF (693K) -
Satoshi KATO, Yoshiihko MIZUTANI, Tetsuo UCHIDA, Chuzo IIDA1984 Volume 18 Issue 1 Pages 29-35
Published: August 25, 1984
Released on J-STAGE: November 24, 2016
JOURNAL FREE ACCESSChemical analyses of ground and river waters of the Shogawa Fan, Toyama, have been made to identify sources of water and to interpret the flow direction of ground water in aquifers in the Fan. The analyses indicate 5 main ground water systems to exist in the Fan and its surrounding areas. The 2 systems are recharged by seepage from the Oyabe and Sho Rivers, respectively, and the others are by local rainfall in the Tonamiyama and Hotatsu Hills and Takashozu Range, respectively. Intermixing of water between the systems is also found near the foot of the Fan. Infiltration from the surface is suggested to interpret the increase in the sodium, chloride and sulfate con- centrations of ground waters. The increase in the calcium, magnesium and bicarbonate concentrations of ground waters is due probably to the dissolution of carbonates, such as CaCO3+CO2+H2O=Ca2++2HCO3-, in the aquifers. Inflows from mineral springs into the ground waters are also detected near the foot of the Tonamiyama and Hotatsu Hills.View full abstractDownload PDF (641K) -
Norio FUKUZAKI, Ryozo TAMURA, Ikuei KIFUNE, Yoshimitsu SHINODA1984 Volume 18 Issue 1 Pages 37-43
Published: August 25, 1984
Released on J-STAGE: November 24, 2016
JOURNAL FREE ACCESSGaseous and particulate mercury in the atmosphere was collected simultaneously at ten sampling stations which located northwest of Niigata Plain at selected twelve days in 1981 and 1982. Gaseous mercury was collected on gold coated Chromosorb P, while particulate mercury was on quartz fiber filter. Both were determined by flameless atomic absorption spectrophotometry with a combution-gold trapping-heat vaporization procedure. The gaseous mercury concentration obtained in this region ranged from 1.3 to 11 ng/m3 with a median 3.1 ng/m3, which agreed well with the reported background concentrations. There was no large variations between daytime and nightime, and among sampling stations with respect to the gaseous mercury concentration. While the particulate mercury concentration ranged from 0.006 to 1.6 ng/m3 with a median 0.026 ng/m3. It was detected that the particulate mercury concentration significantly rise as according to the elevation of the gaseous mercury concentration. The ratio of particulate mercury to gaseous mercury at background level ranged from 0.15×10-2 to 23×10-2 with a median 0.86×10-2.View full abstractDownload PDF (623K)
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