作者机构：
湖南省灌溉水源水质污染净化工程技术研究中心, 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙, 410128;湖南农业大学资源环境学院, 长沙, 410128;农业农村部南方产地污染防控重点实验室, 农业农村部南方产地污染防控重点实验室, 长沙, 410128;[彭鸥; 铁柏清; 刘玉玲; 李丹阳] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China<&wdkj&>Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha, 410128, China<&wdkj&>Key Laboratory of Southern Farmland Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha, 410128, China;[周靖恒; 喻崴伦] Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha, 410128, China
通讯机构：
College of Resources and Environment, Hunan Agricultural University, Changsha, China
作者机构：
[刘玉玲; 朱虎成; 彭鸥; 李丹阳; 杨蕊嘉; 彭晶; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha;Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha;[刘玉玲; 彭鸥; 李丹阳; 杨蕊嘉; 彭晶; 铁柏清] 410128, China<&wdkj&>Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha
通讯机构：
College of Resources and Environment, Hunan Agricultural University, Changsha, China
作者机构：
湖南农业大学资源环境学院, 湖南, 长沙, 410128;重金属污染耕地安全高效利用湖南省工程研究中心, 重金属污染耕地安全高效利用湖南省工程研究中心, 湖南, 长沙, 410128;农业部南方产地污染防控重点实验室, 农业部南方产地污染防控重点实验室, 湖南, 长沙, 410128;茶陵县农业局, 湖南, 株洲, 412400;[彭鸥; 李丹阳; 刘寿涛; 罗海艳; 魏祥东; 叶长城; 刘孝利; 铁柏清] College of Resources and Environment of Hunan Agricultural University, Changsha, 410128, China<&wdkj&>Engineering Research Center of Safe and Efficient Utilization of Heavy Metal Polluted Farmland, Changsha, Hunan Province 410128, China<&wdkj&>Key Laboratory of Southern China Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, Changsha, 410128, China
通讯机构：
Chaling County Bureau of Agriculture, Zhuzhou, China
作者机构：
[韩廿; 黄益宗; 张盛楠; 王丙烁; 保琼莉; 黄永春] Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China;[魏祥东; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
作者机构：
湖南农业大学资源环境学院, 长沙, 410128;湖南省灌溉水源水质污染净化工程技术研究中心, 湖南省灌溉水源水质污染净化工程技术研究中心, 长沙, 410128;农业部南方产地污染防控重点实验室, 农业部南方产地污染防控重点实验室, 长沙, 410128;[刘寿涛; 杨蕊嘉; 何钟响; 彭鸥; 刘玉玲; 董思俊; 彭晶; 刘孝利; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China<&wdkj&>The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Changsha, 410128, China<&wdkj&>Key Laboratory of Southern Original Agro-environmental Pollution Prevention and Control, Ministry of Agriculture, Changsha, 410128, China
摘要：
Iron ore tailings (FeT) and manganese ore tailings (MnT), which are abundant and inexpensive materials that contain many trace elements, were employed for the remediation of As-contaminated soil to mitigate As accumulation in rice under greenhouse conditions. Prior to the experiments, the toxicities of both amendments were assessed with the toxicity characteristic leaching procedure (TCLP) and horizontal vibration method (HVM). Based on the assessment results, both amendments were pretreated until no As was present in the leaching solution. After application of both amendments to the soil, the soil pH increased significantly (p < 0.05). The ranges of As concentrations in husk and brown rice samples were 0.13-1.54 mg kg(-1) and 0.06-0.42 mg kg(-1), respectively. The lowest concentrations of As (0.06 +/- 0.02 mg kg(-1)) in rice grains were observed with MnT treatment, which was related to the structure and composition of MnT. There was a significant negative relationship (p < 0.05) between Mn and As in rice plants, while there was a significant positive relationship (p < 0.05) between Fe and As in rice plants as well as the ratio of Fe/Mn and As in rice plants. In conclusion, MnT could potentially be useful as an amendment to remediate As-contaminated soil and control As uptake by rice plants. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
摘要：
Manganese oxides are naturally occurring powerful oxidants and scavengers, which can control the mobility and bioavailability of arsenic (As). However, the effect of synthetic nanostructured manganese oxides on the mobilization and transportation of As at actual paddy soils are poorly understood, especially in soils with low or medium background Mn concentration. In the present study, a novel nano manganese oxide with superior reactivity and surface area has been synthesized. A 90-d soil incubation experiment combined with pot and field rice cultivation trials were designed to evaluate the effectiveness of exogenous alpha-MnO2 nanorods on the mobilization and transportation of As in soil-rice systems. Our results proved that the addition of alpha-MnO2 nanorods can effectively control the soil-to-solution partitioning of As under anaerobic conditions. After treatment with different amounts of alpha-MnO2 nanorods, the content of effective As decreased, offset by an increase in residual As and insoluble binding As (Ca-As and Fe-As). Enhancing the oxidation of As(III) into As(V), the alpha-MnO2 nanorods increased the adsorption of As onto indigenous iron (hydr)oxides which greatly reduced the soil porewater As content. In addition, pot experiments and field applications revealed that the influx of As into the aerial parts of rice plants (stems, husk and leaves) was strictly prohibited after treatments with different amount of alpha-MnO2 nanorods; more interestingly, significantly negative correlations have been observed between As and Mn in rice, which indicated that as Mn is increased in soil, As in brown rice decreases. Our results demonstrated that the use of alpha-MnO2 nanorods in As polluted paddy soil containing low levels of background Mn oxides can be a promising remediation strategy.
作者机构：
[彭鸥; 刘玉玲; 铁柏清; 何钟响; 杨蕊嘉; 李丹阳; 刘寿涛; 罗海艳] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha;Key Laboratory of Southern China Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha;[彭鸥; 刘玉玲; 铁柏清; 何钟响; 杨蕊嘉; 李丹阳; 刘寿涛; 罗海艳] 410128, China<&wdkj&>Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha
通讯机构：
College of Resources and Environment, Hunan Agricultural University, Changsha, China
作者机构：
[刘亦婷] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China;Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha, 410128, China;Hunan Eng. Res. Ctr. for Safe and High-Efficient Utiliz. of Heavy Metal Poll. Farmland, Changsha, 410128, China;[刘玉玲; 彭鸥; 铁柏清; 罗海艳; 李丹阳; 刘寿涛] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China<&wdkj&>Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha, 410128, China<&wdkj&>Hunan Eng. Res. Ctr. for Safe and High-Efficient Utiliz. of Heavy Metal Poll. Farmland, Changsha, 410128, China
作者机构：
湖南农业大学资源环境学院,长沙410128;湖南省灌溉水源水质污染净化工程技术研究中心,长沙410128;重金属污染耕地安全高效利用湖南省工程研究中心,长沙410128;[Yu-Ling L.; Xiao-Li L.; Ou P.; Bai-Qing T.; Xiang-Dong W.; Xi-Hong Z.; Si-Jun D.] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China, Engineering Research Center for Water Pollution Purification of Irrigation Source, Changsha, Hunan Province 410128, China, Engineering Research Center of Efficient Utilization of Heavy Metal Polluted Croplands, Changsha, Hunan Province 410128, China
通讯机构：
[Bai-Qing, T.] C;College of Resources and Environment, China
摘要：
In order to study the role of mulberry (Moms alba L) as an economic crop for remediation of cadmium (Cd) contaminated soil, the transport of Cd from mulberry to silkworm were investigated. Three varieties of mulberry (Yuesang-11, Nongsang-14, and Qiangsang-1) with three planting densities were cultivated in two heavy metal -contaminated fields named Dongkou in Shaoyang city and Linxiang in Yueyang city in Hunan province respectively. The both field soils were contaminated by heavy metals, especially by Cd. The potential risks of heavy metals in Linxiang's soil were higher than those in Dongkou's because of higher concentrations of Cd. Since the promotion of Cd concentrations in aerial parts (stem, branch and leaf) resulted from the increase of planting density, the method of high planting density is beneficial to improve the efficiency of the remediation of Cd contaminated soil. The percentages of average Cd contents of mulberry in Dongkou accounted for 44%, 20%, 18% and 16% in roots, stems, branches and leaves respectively, while the Cd contents were 38%, 27%, 19% and 16% distributed in roots, stems, branches and leaves respectively. Mulberry leaves from contaminated soils was applied in food source of silkworms in this study. Although there is Cd uptake occurred in silkworm growth and its products (cocoons and chrysalis), Cd contents in cocoons are lower than the national standard (100 mu g*kg-1) for textile industry of China. Therefore, mulberry can be regarded as an economical crop to control soil contamination with Cd. (C) 2019 Elsevier Ltd. All rights reserved.
作者机构：
湖南农业大学资源环境学院,长沙410128;湖南省灌溉水源水质污染净化工程技术研究中心,长沙410128;[刘玉玲; 罗海艳; 杨蕊嘉; 李丹阳; 刘寿涛; 铁柏清; 彭鸥] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China, Hunan Engineering and Technology Research Center for Irrigation Water Purification, Changsha, 410128, China
通讯机构：
[Tie, B.] C;College of Resources and Environment, China
作者机构：
[李园星露; 叶长城; 刘玉玲; 李丹阳; 刘寿涛; 罗海艳; 刘孝利; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Engineering Research Center of Efficient Utilization of Heavy Metal Pollution Cultivated, Changsha;Hunan Province;410013, China
