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• W2366572876 abstract "Fenghuang lead-zinc deposit is one of the major production bases of nonferrous metals in Hunan Province. The ores in the deposit are characterized not only by base-metals content but also by the presence of other metals such as Cd, Hg and As as impurity elements. Intensive mining-refining operations and random disposal of tailings in addition to little governmental control cause heavy metals discharging into argo-ecosystem, which may in particular cause a widespread occurrence of heavy metals in the entire food chain and bring a series of toxicosis symptoms in animals and human beings. Therefore, monitoring of those elements and understanding their behaviors in soil-plant system are critical to establish the risk assessment of local and regional ecosystems. In this study, concentrations of lead (Pb), cadmium (Cd), mercury (Hg) and arsenic(As) in plough horizon soils as well as their translocation and accumulation by paddy in Fenghuang lead-zinc deposit area were studied based on field systematic sampling and laboratory analysis. The average concentration of Pb, Cd, Hg and As in plough horizon soils were 875, 10.70, 4.25 and 62.24 mg·kg-1, respectively, which were 2.9, 35.7, 8.5 and 2.5 times higher than the benchmark value of Grade Ⅱ environmental quality standard for soil. The concentrations of Pb and As in local paddy rice were 2.0~7.7 times and 0.9~2.9 times higher than those in the National Environmental Quality Standard for Grain, respectively, suggesting that rice in the deposit area was seriously polluted by Pb and As. However, Hg and Cd contamination were less severe in local paddy rice. The average concentrations of Pb, Hg and As in different organs of paddy followed the trend: root leaf stalk rice, whereas the average concentration of Cd followed the trend of root stalk leaf rice. The concentrations of Pb, Cd, Hg and As in plough horizon soils were significant positively correlated with those in paddy roots. Moreover, the concentrations of those soil heavy metals were positively correlated with the soil organic matter contents and sand contents but negatively correlated with the soil silica-sesquioxide ratio, silt contents and clay contents. Compared with the concentrations of heavy metals in plough horizon soil, their concentrations in the leaf have higher correlation with their concentrations in paddy rice, suggesting that, besides the uptake from soil, the translocation from the leaf was also an important transmitting channel for heavy metals accumulation in grains in the study area." @default.
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• W2366572876 date "2008-01-01" @default.
• W2366572876 modified "2023-09-25" @default.
• W2366572876 title "Translocation and Accumulation of Heavy Metals in Soil-Paddy System at Fenghuang Lead-Zinc Deposit Area" @default.
• W2366572876 hasPublicationYear "2008" @default.
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