作者机构：
[王英杰; 邹佳玲; 周航; 廖柏寒] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[杨文弢] College of Bioscience and Technology, Hunan Agricultural University, Changsha;410128, China;[王英杰; 邹佳玲; 周航; 廖柏寒] 410004, China
作者机构：
[吴玉俊; 周航; 杨文弢; 邹紫今; 朱维; 辜娇峰; 彭佩钦; 张平; Zeng, Min; 廖柏寒] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[吴玉俊; 周航; 杨文弢; 邹紫今; 朱维; 辜娇峰; 彭佩钦; 张平; Zeng, Min; 廖柏寒] 410004, China
摘要：
The objectives of the present study were to investigate heavy metal accumulation in 22 vegetable species and to assess the human health risks of vegetable consumption. Six vegetable types were cultivated on farmland contaminated with heavy metals (Pb, Cd, Cu, Zn, and As). The target hazard quotient (THQ) method was used to assess the human health risks posed by heavy metals through vegetable consumption. Clear differences were found in the concentrations of heavy metals in edible parts of the different vegetables. The concentrations of heavy metals decreased in the sequence as leafy vegetables > stalk vegetables/root vegetables/solanaceous vegetables > legume vegetables/melon vegetables. The ability of leafy vegetables to uptake and accumulate heavy metals was the highest, and that of melon vegetables was the lowest. This indicated that the low accumulators (melon vegetables) were suitable for being planted on contaminated soil, while the high accumulators (leafy vegetables) were unsuitable. In Shizhuyuan area, China, the total THQ values of adults and children through consumption of vegetables were 4.12 and 5.41, respectively, suggesting that the residents may be facing health risks due to vegetable consumption, and that children were vulnerable to the adverse effects of heavy metal ingestion.
通讯机构：
[Zeng, Dewen] C;Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
摘要：
The solubilities of anhydrite in the ternary systems CaSO4 + MSO4 + H2O (M = Co, Ni) were determined through isothermal solution saturation at 348.1 K and 363.1 K. At low bivalent metal sulfate concentrations, anhydrite solubility decreases until it eventually reaches a minimum. Anhydrite solubility subsequently increases with the amount of heavy metal sulfate to a maximum. At this point, further increases in the concentration of metal sulfate decreases the solubility of anhydrite until saturation of the added bivalent metal sulfate. A Pitzer thermodynamic model was selected to predict isopiestic data including calcium sulfate solubilities of the ternary systems CaSO4 + MSO4 + H2O (M = Mn, Co, Ni, Cu, Zn) from 298.1 K to 373.1 K. The functional dependencies of the MSO4 (M = Ni, Cu, Zn) ion interaction parameters with temperature were determined, and the third virial parameters were given. The calculated solubilities are in agreement with the available experimental data. Using the Pitzer model and parameters, the solubility isotherms of metastable solid-phase hemihydrate, as well as gypsum and anhydrite, in the CaSO4 + MSO4 + H2O (M = Mn, Co, Ni, Cu, Zn) systems were predicted over a wide range of temperatures and concentrations.
作者机构：
[邹紫今; 彭佩钦; 廖柏寒; 吴玉俊; 周航; 朱维; 杨文弢; Zeng M.; 辜娇峰] College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Liao, B.] C;College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha, China
通讯机构：
[Liao, Bo-Han] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Heavy metal;Rice (Oryza sativa L.);Soil;Iron plaque;Translocation
摘要：
Rice (Oryza sativa L.) planted on heavy metal contaminated soil is a source of toxic elements entering the food chain and thereby posing a threat to human health. The main objective of this study was to investigate heavy metals uptake, translocation, and accumulation differences in iron plaque and rice tissues among the rice cultivars. In the present study, 32 hybrid rice cultivars were cultured on heavy metal contaminated paddy soil. Pb, Cd, Cu, and Zn concentrations in rice tissues (root, straw, husk, and brown rice) and in the iron plaques on rice root surfaces were measured. Significant differences of Pb, Cd, Cu, and Zn tolerance, concentrations and accumulation in 32 rice cultivars were observed. However, no significant difference was observed in concentrations of Pb, Cd, Cu, and Zn in two-line hybrid rice and three-line hybrid rice. The concentrations of Pb in iron plaques were significantly positive linearly correlated with concentrations of Pb in rice roots, and concentrations of Cd and Cu were significantly negative linearly correlated with Cd and Cu in rice roots. The concentrations of heavy metal in brown rice were significantly positively correlated with the translocation factors TFhb (from husk to brown rice) and TFsh (from straw to husk). It indicated that iron plaque plays an important role in mediating heavy metal entering into rice roots, and heavy metal accumulation in brown rice was related to its ability to transfer in the husk and straw rather than the root.
作者机构：
[吴燕明; 邓贵友; 廖柏寒; 周航] Research Center for Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;Changsha Environmental Protection Vocational College, Changsha, 410004, China;[刘丽] Research Center for Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China, Changsha Environmental Protection Vocational College, Changsha, 410004, China
通讯机构：
[Liao, B.] R;Research Center for Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[Zeng, Min; 周航; 廖柏寒; 杨文弢; 周歆; 王英杰; 刘丽] Institute of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[周航] College of Bioscience and Technology, Hunan Agricultural University, Changsha 410128, China
通讯机构：
Institute of Environment Science and Engineering, Central South University of Forestry and Technology, China
摘要：
湘南烟区土壤pH值从80年代的偏酸性变为当前的偏碱性,短短20余年,pH值变化极为显著。在郴州市桂阳县偏碱烟田土壤中施用改良剂硫酸亚铁(FeSO_4),研究其对偏碱土壤的调控效果以及对烟草吸收养分的影响,研究结果表明:(1)施用0.25~ 4.0 g kg~(-1)的FeSO_4能使土壤的pH值从7.87降低到7.58,但土壤pH值下降幅度不大。(2)施用0.25~ 4.0 g kg~(-1)的FeSO_4对土壤有机质、碱解N、速效K、交换性Ca、Mg、有效Mn、有效Cu、有效Zn含量没有显著影响,使土壤有效P含量降低了2.26%~ 17.70%,有效Fe含量增加了6.00%~ 26.73%。(3)施用FeSO_4后烟叶中养分含量的变化基本与土壤中养分的变化规律一致,0.25~ 4.0 g kg~(-1)的硫酸亚铁使烟叶Ca和P含量分别降低1.21%~ 11.36%、4.29%~ 11.66%,Fe、Mn和Zn含量分别提高了0.25%~ 8.15%、3.69%~ 7.72%和4.71%~ 8.63%。(4)FeSO_4施用量为2.00 g kg~(-1)为最佳施用量,当施用量较低时(< 2.0 g kg~(-1))能提高烟草的单叶重,但无法达到调控土壤pH值的目的,较高时(4.0 g kg~(-1))却降低了烟叶的株高和单叶重,抑制了烟草的生长。
摘要：
Stabilization of heavy metals in situ was investigated. Two combined amendments (LS, limestone+ sepiolite; HZ, hydroxyhistidine+zeolite) were applied at ratios of 0.2%, 0.4%, and 0.8% (w/w) to paddy soil with multi-metal (Pb, Cd, Cu, and Zn) contamination. The effects of these two combined amendments on heavy metal bioavailability in soil, and on uptake and accumulation of heavy metals in rice plants were investigated. Application of LS and HZ significantly increased soil pH values and cation exchange capacity contents, and resulted in a reduction in exchangeable fraction of metals and in extract metal concentrations of amended soils through toxicity characteristic leaching procedure (TCLP). LS and HZ obviously inhibited uptake and accumulation of Pb, Cd, Cu, and Zn in rice plants. Compared with the control soil, concentrations of Pb, Cd, Cu, and Zn in brown rice were decreased by 10.6-31.8%, 16.7-25.5%, 11.5-22.1%, and 11.7-16.3%, respectively, as a result of 0.2% to 0.8% addition of LS, and decreased by 5.1-40.8%, 16.7-20.0%, 8.1-16.2%, and 13.3-21.7%, respectively, as a result of 0.2-0.8% addition of HZ. Significant positive linear correlations were found between heavy metal concentrations in TCLP extracts and those in rice tissues except for Pb. Extracting heavy metals with TCLP was a more suitable method for estimating heavy metal bioavailability concentrations of amended soil than exchangeable fraction of heavy metals, because the latter underestimated heavy metal bioavailability. These results demonstrate that LS and HZ could be effective in reducing heavy metal bioavailability and accumulation in rice grown on multi-metal-contaminated soils. (C) 2014 Elsevier Inc. All rights reserved.
