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Attenuation of Metal Bioavailability in Acidic Multi-Metal Contaminated Soil Treated with Fly Ash and Steel Slag

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Pedosphere 2012年第4期22卷 544-553页

作者： qiu Hao GU Hai-Hong HE Er-Kai WANG Shi-Zhong qiu rong-liang School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275(China) Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology Guangzhou 510275(China)

A pot experiment was conducted with multi-metal （Pb, Cd, Cu, and Zn） contaminated acidic soil to investigate changes in available metal burden resulting from the application of industrial wastes （fly ash and steel slag）. The efficiency of amendments- induced metal stabilization was evaluated by diffusive gradients in thin films （DGT）, sequential extraction, and plant uptake. The stability of remediation was assessed by an acidification test and by chemical equilibrium modeling. Addition of fly ash （20 g kg-1） and steel slag （3 g kg-1） resulted in similar increase in soil pH. Both amendments significantly decreased the concentrations of metals measured with DGT （CDGT） and the metal uptake by Oryza sativa L. Significant correlations were found between CDGT and the concentration of a combination of metal fractions （exchangeable, bound to carbonates, and bound to Fe/Mn oxides）, unraveling the labile species that participate in the flux of metal resupply. The capability of metal resupply, as reflected by the R （ratio of CDGT to pore water metal concentration） values, significantly decreased in the amended soils. The CDGT correlated well with the plant uptake, suggesting that DGT is a good indicator for bioavailability. Acidification raised the extractable metal concentration in amended soil but the concentration did not return to the pre-amendment level. Equilibrium modeling indicated that the soil amendments induced the precipitation of several Fe, A1 and Ca minerals, which may play a positive role in metal stabilization. Chemical stabilization with alkaline amendments could be an effective and stable soil remediation strategy for attenuating metal bioavailability and reducing plant metal uptake.

关键词： acidification chemical stabilization diffusive gradients in thin films (DGT) heavy metal remediation

Specific Heat of a Two-Layer Magnetic Superlattice

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Communications in Theoretical Physics 2009年第11期52卷 969-973页

作者： qiu rong-Ke liang Jing ZHAO Jian YING Cai-Hong Shenyang University of Technology Shenyang 110023 China

The specific heats of both a two-layer ferromagnetic superlattice and a two-layer ferrimagnetic one *** is found that the spin quantum numbers,the interlayer and intralayer exchange couplings,the anisotropy,theapplied magnetic field,and the temperature all affect the specific heat of these *** both the ferromagneticand ferrimagnetic superlattices,the specific heat decreases with increasing the spin quantum number,the absolutevalue of interlayer exchange coupling,intralayer exchange coupling,and anisotropy,while it increases with increasingtemperature at low *** an applied magnetic field is enhanced,the specific heat decreases in the two-layerferromagnetic superlattice,while it is almost unchanged in the two-layer ferrimagnetic superlattice at low fieldrange at low temperatures.

关键词： ferromagnetic and ferrimagnetic superlattice specific heat anisotropy spin quantum numbers interlayer and intralayer exchange couplings applied magnetic field

A Fuzzy-based Methodology for an Aggregative Environmental Risk Assessment of Restored Soil

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Pedosphere 2014年第2期24卷 220-231页

作者： WANG Shi-Zhong ZHAO Zhi-Hao XIA Bing qiu Hao J.L.MOREL qiu rong-liang School of Environmental Science and Engineering Sun Yat-sen University Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology Laboratoire Sols et Environnement UMR 1120 ENSAIA-INPL/INRA

Environmental risks pertaining to contaminated soils have been well studied,while little attention has been paid to the risks of the soils after remediation. In this study,a concept model developed based on fuzzy set theory was applied to evaluate the uncertainties of three risk indicators,namely,plant growth,groundwater safety and human health,of a restored site that had been previously polluted by heavy metals. The concept model classified the grade and importance of risk factors by an 11-level ranking system and was able to yield a comprehensive risk result rather than multi-risk results for complex risk indicators. Modeling results showed that the risks to the three indicators were effectively reduced after the remediation. Moreover,great sensitivity of the risks was found related to the weight distribution among the three risk indicators. In general,the risks of both polluted and restored soils to the environment were in the order of groundwater safety > plant growth > human health. The model was proved to solve the problems of multi-risk results due to complex risk indicators that previously encountered by other researchers,which made it helpful in decision-making and management of restored soils.

关键词： fuzzy set theory heavy metals remediated risk assessment weight distribution

同步放化疗联合早期综合营养治疗在局部晚期鼻咽癌中的应用价值

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中国现代医学杂志 2024年第8期34卷 65-69页

作者：刘新菊刘冬梅邱荣良郑州大学附属肿瘤医院(河南省肿瘤医院) 河南郑州450003

目的探讨同步放化疗联合早期综合营养治疗在局部晚期鼻咽癌中的应用价值。方法回顾性分析2018年1月—2020年12月在河南省肿瘤医院就诊的100例局部晚期鼻咽癌患者,根据不同干预方式分为对照组和观察组,每组50例。对照组同步放化疗和常... 详细信息

目的探讨同步放化疗联合早期综合营养治疗在局部晚期鼻咽癌中的应用价值。方法回顾性分析2018年1月—2020年12月在河南省肿瘤医院就诊的100例局部晚期鼻咽癌患者,根据不同干预方式分为对照组和观察组,每组50例。对照组同步放化疗和常规营养支持,观察组接受同步放化疗联合早期综合营养治疗方案,对比两组患者认知水平、干预前后营养状态、免疫功能和远期疗效。结果观察组营养认知、食欲、功能和饮食配合评分高于对照组(P 0.05)。观察组治疗前后CD3^(+)、CD4^(+)、CD4^(+)/CD8^(+)的差值高于对照组(P 0.05)。观察组总生存率、疾病特异性生存率、无局部复发率和无远处转移生存率高于对照组(P <0.05)。结论局部晚期鼻咽癌患者予以同步放化疗联合早期营养治疗方案,可提高认知水平,减少疾病对营养状态和免疫功能的影响,对预后有明显改善作用。

关键词：局部晚期鼻咽癌同步放化疗早期综合营养治疗营养状态免疫功能

农田离子型新兴有机污染物的作物吸收、分布和转化机制研究进展

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生态与农村环境学报 2024年第3期40卷 293-302页

作者：姜彦岐黄健石傲傲徐凯然任俊明倪卓彪阿丹林庆祺仇荣亮华南农业大学资源环境学院广州广东510642 广东省农业农村污染治理与环境安全重点实验室广州广东510642 岭南现代农业科学与技术广东省实验室广州广东510642 仲恺农业工程学院资源与环境学院/广东省普通高校农业产地污染综合防治工程技术研究中心广州广东510225 中山大学环境科学与工程学院广州广东510006

农田新兴有机污染物可通过作物吸收进入食物链从而威胁人体健康,其中,离子型新兴有机污染物(ionic emerging organic pollutants,IEOPs)因挥发性较弱、极性强而具有更为复杂的环境行为,因此,了解作物对IEOPs的吸收转化过程及机制,对明确... 详细信息

农田新兴有机污染物可通过作物吸收进入食物链从而威胁人体健康,其中,离子型新兴有机污染物(ionic emerging organic pollutants,IEOPs)因挥发性较弱、极性强而具有更为复杂的环境行为,因此,了解作物对IEOPs的吸收转化过程及机制,对明确IEOPs在农田系统中的归趋具有重要意义。该文综述了作物对IEOPs的吸收转运过程,重点介绍了IEOPs自身理化性质与作物组成、转运蛋白、调控基因等因素对该吸收转运过程的影响;从器官、组织和亚细胞等不同水平分析了IEOPs在作物中的累积分布规律;介绍了IEOPs在作物体内的酶促转化机理;最后,从加强IEOPs吸收机理研究、完善预测模型和关注作物体内转化机制等方面对该研究领域进行展望。

关键词：新兴有机污染物农田作物吸收分布体内转化

PAHs Sorption and Desorption on Soil Influenced by Pine Needle Litter-Derived Dissolved Organic Matter

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Pedosphere 2014年第5期24卷 575-584页

作者： YANG Xiu-Hong P.GARNIER WANG Shi-Zhong V.BERGHEAUD HUANG Xiong-Fei qiu rong-liang School of Environmental Science and Engineering Sun Yat-sen University Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology INRA UMR1091 EGCBP 01 F-78850 Thiverval-Grignon (France)

Study of the relationship between plant litter-derived dissolved organic matter(DOM) and organic pollutant transport in soil is important for understanding the role of forest litter carbon cycling in influencing pollutant behaviour and fate in forest *** the aim of providing insight into the capacity of plant litter-derived DOM to influence sorption and desorption of selected polycyclic aromatic hydrocarbons(PAHs) on soil, batch experiments were carried out with application of a sorption-desorption model incorporating DOM effects. Freshly fallen pine(Pinus elliottii) needles were used as the source of organic matter. Input of the pine needle litter-derived DOM was found to significantly decrease desorption hysteresis as well as soil adsorption capacity of phenanthrene(PHE) and fluoranthene(FLA). Addition of 1 728 mg L-1dissolved organic carbon(DOC) lowered the organic carbon-normalized sorption distribution coefficient of PHE from 7 776 to 2 541 L kg-1C and of FLA from 11 503 to 4 368 L kg-1C. Decreases of the apparent sorption-desorption distribution coefficients of PHE and FLA with increased DOC concentration indicated that DOM favored desorption of PAHs from soil. Increases in the fraction of apparently dissolved PAHs were attributable to the dissolved PAH-DOM complexes, accounting for the dissolved proportions of 39% to 69% for PHE and 26% to 72% for FLA in the sorption and desorption processes as the concentration of the added DOM solution rose from 0 to 1 728 mg L-1. Our results suggest that pine needle litterderived DOM can have a substantial effect of inhibiting PAHs sorption and promoting PAHs desorption, thus leading to enhanced leaching in soil, which should be taken into account in risk assessment of PAHs accumulated in forest soil.

关键词： dissolved organic carbon distribution coefficient fluoranthene hysteresis phenanthrene

Cellular Tolerance, Accumulation and Distribution of Cadmium in Leaves of Hyperaccumulator Picris divaricata

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Pedosphere 2012年第4期22卷 497-507页

作者： HU Peng-Jie GAN Yuan-Yuan TANG Ye-Tao ZHANG Quan-Fang JIANG Dan YAO Nan qiu rong-liang School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275(China) Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275(China) School of Life Sciences Sun Yat-sen UniversityGuangzhou 510275(China) Instrumental Analysis and Research Center Sun Yat-sen UniversityGuangzhou 510275(China)

Knowledge of cellular metal homeostasis will provide a better understanding of the mechanisms involved in metal tolerance and hyperaccumulation in metal-hyperaccumulating plants. Energy dispersive X-ray spectrometry （EDS） was used to determine the localization of cadmium （Cd） in leaves of the Zn/Cd hyperaccumulator Picris divaricata which had a shoot Cd concentration of 565 mg kg-1 after 2 weeks of growth in solution culture supplying 10μ tmol L^-1 CdCl2. The results indicated that Cd was distributed mainly in the trichomes, upper and lower epidermis and bundle sheath cells, with a relatively low level of Cd in mesophyll cells. Mesophyll protoplasts isolated from leaves remained viable after 24 h exposure to CdCl2 at a concentration up to 1 mmol L^-1, indicating their high tolerance to Cd. The intracellular Cd was visualized by staining with Leadmium Green dye, a cellular permeable Cd fluorescence probe. The results showed that the majority of protoplasts （〉 82%） did not accumulate Cd, with only a minority （〈 18%） showing Cd accumulation. In the Cd-accumulating protoplasts, Cd accumulation was depressed by the addition of Fe^2＋, Mn^2＋ and the metabolic inhibitor carbonyl cyanide m-chlorophenylhydrazone （CCCP）, but not by Ca^2＋ or Zn^2＋. Furthermore, the entire process of Cd uptake from external solution into the cytoplasm and subsequent sequestration into vacuoles was successfully recorded by confocal images. These results suggested that reduced cellular Cd accumulation and efficient Cd vacuolar sequestration in mesophyll cells might be responsible for cellular Cd tolerance and distribution in the leaves of P. divaricata.

关键词： confocal images fluorescence probe mesophyll protoplast vacuolar

Morphogenesis of Vertisols: A Model Study

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Pedosphere 1996年第3期 259-268页

作者： qiu rong-liang HUANG RUI-CAI and XIONG DE-XIANG (Department of Geology, Zhongshan University, Guangzhou 510275 China)(Department of Soil Science and Agricultural Chemistry, Nanjing Agricultural University, Nanjing 210014China)

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关键词： pedoturbation model soil mechanics model Vertisols

Solid components and acid buffering capacity of soils in South China

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Journal of Environmental Sciences 1998年第2期10卷 42-48页

作者： qiu rong liang, Wu Qing, Zhang Yun ni Department of Environmental Science, Zhongshan University, Guangzhou 510275, China

The effects of soil solid components on soil sensitivity to acid deposition by sequential extraction method were studied. A multiple regression equation of soil sensitivity was set up on the basis of stepwise regression analysis. The results showed that organic matter expressed dual effects that were decided by soil original pH value and exchangeable cation composition on acid buffering reactions. The hydrolysis of activated oxides was a very important proton buffering reaction when in low pH situation. The crystalline oxides also played a role in the buffering reactions, but the role was restricted by the rate of activation of oxides. Meanwhile, the results by stepwise analysis showed that factors that had significant effect on soil acid buffering capacity were content of montmorillite, soil original pH value, Al 0, Mn 0 and CEC in decreasing order. Finally, sixteen soils were classified into four types of sensitive with single index cluster and multiple fuzzy cluster analysis respectively.

关键词： acid deposition acid buffering capacity soil sensitivity solid components.