細倉鉱山・製錬所から排出されたタリウムとその関連有害金属による河川底質と土壌の汚染

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We determined the total concentrations of Tl and nine related harmful metals (Cu, Zn, As, Ag, Cd, Sb, Te, Pb, and Bi) in 10 sediment samples and 19 soil samples collected near the Hosokura Mine and Smelter. The Hosokura Mine and Smelter, which previously produced large amounts of Pb, Zn, Cd, and Ag and smaller amounts of Cu, Sb, Tl, and Bi, discharged fumes, dust, and waste water. The maximum concentration of Tl (79.9 mg kg^<-1> DW) in the sediments was observed at a site about 1 km downstream of the contamination source and was 258 times higher than the background level of soil Tl. However, the Tl concentration in the sediments decreased downstream. The Tl in soils was also higher near the contamination source but was much lower than that of the sediments. The maximum concentration of soil Tl (2.39 mg kg^<-1> DW) is 7.7 times higher than the background level. The geometric means (mg kg^<-1> DW) of Cu (302), Zn (3930), As (132), Ag (11.8), Cd (49.5), Sb (35.4), Te (7.55), Tl (17.5), Pb (2080), and Bi (13.9) concentrations in the river sediment were 16, 66, 19, 157, 168, 96, 184, 56, 121 and 41 times higher than the background levels. In comparison, the geometric means (mg kg^<-1> DW) of those metal concentrations in the soils were Cu (48.4), Zn (472), As (27.0), Ag (0.96), Cd (2.85), Sb (4.03), Te (0.19), Tl (0.58), Pb (263) and Bi (0.65) and were 2. 6, 7.9, 4.0, 12.8, 9.7, 10.9, 4.6, 1.9, 15.3 and 1.9 times higher than the background levels. From these results, we assume that the harmful metals affect not only the organisms in the rivers, but also the growth of crops. Tl, Cd and some of the other metals will be absorbed by crops and consequently consumed by human beings. High correlation coefficients of nearly all the metals in the sediments and soils were obtained. This means that the contamination source is the same : the Hosokura Mine and Smelter.
東京農工大学の論文
2002-10-25

細倉鉱山・製錬所から排出されたタリウムとその関連有害金属による河川底質と土壌の汚染

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