土壌溶液中の銅イオン活動度と土壌細菌群銅耐性度との関係

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Soil samples with a wide range of copper contents (32 to 11,700 mg kg<-1>), classified as Dystric cambisol and Lithic leptosola (FAO-UNESCO), were investigated for Cu speciation in soil solutions in order to clarify the forms of Cu adversely affecting soil bacteria. The speciation of the metal was estimated using an equilibrium thermodynamic computer model, SOILCHEM. The copper effects on soil bacteria were evaluated by an indicator: Cu tolerance level of the bacterial community, shown as IC_<50>. The simulated free ion of Cu in the soil solutions ranged from 18 to 98% of total Cu, and organic complexes of Cu from <1 to 56%. The estimated Cu speciation in the soil solution was dependent on a variety of soil properties. The copper metal tolerance levels of the bacterial community were dependent on copper ion activities with a high square of correlation coefficients (R^2=0.735, P<0.01), but had no relationship with the total concentration of Cu in the soils. The results proved that the high ion activities in the soil solutions led to the development of the heavy metal tolerance levels in the bacterial community. IC_<50> was also correlated with chloride, nitrate and sulfate complexes of Cu in the soil solutions, respectively. The organic-Cu complexes in the soil solutions did not affect the IC_<50> of the bacterial community. Toxicity of the Cu ion was somewhat reduced with the low pH of the soil solutions, implying that protons competed with Cu ions for soil bacterial uptake sites, but accelerated solubilities of the metals from the soil particles.
社団法人日本土壌肥料学会の論文
2000-10-05

土壌溶液中の銅イオン活動度と土壌細菌群銅耐性度との関係

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