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Alum split applications strengthened phosphorus fixation and phosphate sorption in high legacy phosphorus calcareous soil

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Journal of Environmental Sciences 2021年第3期33卷 87-97页

作者： Bingqian Fan Owen Fenton Karen Daly Jiahui Ding Shuo Chen Qing Chen beijing key laboratory of farmyard soil pollution prevention-control and remediation College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Teagasc Environmental Research CentreJohnstown CastleCo.WexfordIreland

High phosphorus(P)saturation arising from historic P inputs to protected vegetable fields(PVFs)drives high P mobilisation to *** of soils with alum has shown potential in terms of fixing labile P and protecting water *** present 15 month pot experiment investigated P stabilisation across single alum application(Alum-1 treatment,20 g alum/kg soil incorporated into soil before the maize was sown),alum split applications(Alum-4 treatment,5 g alum/kg soil incorporated into soil before each crop was sown i.e.4×5 g/kg)and soil only treatment(control).Results showed that the Alum-1 treatment caused the strongest stabilisation of soil labile P after maize plant removal,whereas the P stabilisation effect was gradually weakened due to the transformation of soil non-labile P to labile P and the reduced active Al^(3+)in soil *** the Alum-4 treatment,soil labile P decreased gradually with each crop planting and was lower than the Alum-1 treatment at the end of the final crop removal,without any impairment on plant *** better P stabilisation at the end of Alum-4 treatment was closely correlated with a progressive supply of Al^(3+)and a gradual decrease of pH,which resulted in higher contents of poorlycrystalline Al,Fe and exchangeable *** aspects were conducive to increasing the soil P stabilisation and phosphate *** terms of management,growers in continuous cropping systems could utilise split alum applications as a strategy to alleviate P losses in high-P enriched calcareous soil.

关键词： High legacy phosphorus Calcareous soil Phosphorus stabilisation Alum split applications Non-crystalline Fe/Al

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The risks of sulfur addition on cadmium accumulation in paddy rice under different water-management conditions

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Journal of Environmental Sciences 2022年第8期34卷 101-111页

作者： Zhe Liu Qi-qi Wang Si-yu Huang Ling-xuan Kong Zhong Zhuang Qi Wang Hua-fen Li Ya-nan Wan beijing key laboratory of Farmland soil pollution prevention and remediation Key Laboratory of Plant-Soil Interactions of the Ministry of EducationCollege of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China

Recently, the application of sulfur(S) has been recommended to control the accumulation of cadmium(Cd) in rice in contaminated paddy soil. However, the effects of exogenous S on Cd transfer in paddy rice systems under different water-management practices have not been systematically investigated. Pot experiments were performed to monitor the composition of soil pore water and the Cd accumulation in iron plaque and rice tissue were compared under different S(0 and 200 mg/kg Na_(2)SO_(4)) and water(continuous and discontinuous flooding) treatments. Sulfur application significantly increased Cd concentrations in soil pore water under discontinuous flooding conditions, but slightly reduced them under continuous flooding. Moreover, the oxidation/reduction potential(Eh) was the most critical factor that affected the Cd levels. When the Eh exceeded-42.5 mV, S became the second critical factor, and excessive S application promoted Cd dissolution. In addition, S addition elevated the Cd levels in iron plaque and reduced the Cd transfer from the iron plaque to rice roots. In rice, S addition inhibited Cd transfer from the rice roots to the straw;thus, more Cd was stored in the rice roots. Nevertheless, additional S application increased the Cd content in the rice grains by 72% under discontinuous flooding, although this effect was mitigated by continued flooding. Under simulated practical water management conditions, S addition increased the risk of Cd contamination in rice, suggesting that S application should be reconsidered as a paddy fertilization strategy.

关键词： Rice Cadmium Sulfur Water management Iron plaque Accumulation

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Calcium-based polymers for suppression of soil acidification by improving acid-buffering capacity and inhibiting nitrification

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Journal of Environmental Sciences 2024年第5期139卷 138-149页

作者： Fei Kang Yunshan Meng Yanning Ge Yun Zhang Haixiang Gao Xueqin Ren Jie Wang Shuwen Hu beijing key laboratory of Farmland soil pollution prevention-control and remediation College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Department of Applied Chemistry China Agricultural UniversityBeijing 100193China

soil acidification is a major threat to agricultural sustainability in tropical and subtropical *** and environmentally friendly materials,such as calcium lignosulfonate(CaLS),calcium poly(aspartic acid)(PASP-Ca),and calcium polyγ-glutamic acid(γ-PGA-Ca),are known to effectively ameliorate soil ***,their effectiveness in inhibiting soil acidification has not been *** study aimed to evaluate the effect of CaLS,PASP-Ca,andγ-PGA-Ca on the resistance of soil toward acidification as directly and indirectly(i.e.,via nitrification)caused by the application of HNO_(3)and urea,*** comparison,Ca(OH)_(2)and lignin were used as the inorganic and organic controls,*** the materials,γ-PGA-Ca drove the substantial improvements in the pH buffering capacity(pHBC)of the soil and exhibited the greatest potential in inhibiting HNO_(3)-induced soil acidification via protonation of carboxyl,complexing with Al~(3+),and cation exchange *** acidification induced by urea,CaLS was the optimal one in inhibiting acidification and increasing exchangeable acidity during ***,the sharp reduction in the population sizes of ammonia-oxidizing bacteria(AOB)and ammonia-oxidizing archaea(AOA)confirmed the inhibition of nitrification via CaLS ***,compared to improving soil pHBC,CaLS may play a more important role in suppressing indirect ***,γ-PGA-Ca was superior to PASP-Ca and CaLS in enhancing the soil pHBC and the its resistance to acidification induced by HNO_(3) addition,whereas CaLS was the best at suppressing urea-driven soil acidification by inhibiting *** conclusion,these results provide a reference for inhibiting soil re-acidification in intensive agricultural systems.

关键词： Calcium-based polymer soil acidification pH buffering capacity Nitrification inhibition

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Effects of iron(hydr)oxides on the degradation of diethyl phthalate ester in heterogeneous(photo)-Fenton reactions

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Journal of Environmental Sciences 2019年第6期31卷 5-13页

作者： Wenjuan Shuai Cheng Gu Guodong Fang Dongmei Zhou Juan Gao key laboratory of soil Environment and pollution remediation Institute of Soil Science Chinese Academy of Science University of Chinese Academy of Sciences State key laboratory of pollution control and Resource Reuse School of the Environment Nanjing University

This work studied the structural effects of hematite(α-Fe2 O3), 2-line ferrihydrite(HFO) and goethite(α-FeOOH) on diethyl phthalate ester(DEP) degradation. The results showed that the degradation of DEP was faster under 365 nm light irradiation than in the dark in the presence of iron(hydr)oxides. The apparent kinetic rates of DEP degradation followed the order HFO > goethite ≈ hematite in the dark and HFO > hematite > goethite under 365 nm light irradiation. Two pathways governed H2 O2 decomposition efficiency on iron(hydr)oxide surfaces:(1) forming UOH on inherent surface hydroxyl groups(Fe-OH) and(2) producing O2 and H2 O on the surface oxygen vacancies. X-ray photoelectron spectroscopy(XPS) analyses indicated that HFO not only has high Fe-OH content but also has high Vo content, resulting in its low H2 O2 utilization efficiency(η). DEP was degraded through hydrogen abstraction and deesterification, and the major products were(OH)2-DEP, mono-ethyl phthalate(MEP), OH-MEP,and phthalate acid(PA). The study is important in understanding the transformation of phthalate esters in top surface soils and surface waters under ultraviolet light.

关键词： Diethyl phthalate ester Iron(hydr)oxide Hydroxyl radical Heterogeneous Fenton reactions

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Comparison between sequential and single extraction procedures for metal speciation in fresh and dried Sedum Plumbizincicola

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Journal of Central South University 2015年第2期22卷 487-494页

作者：宋祖威仲兆平钟道旭吴龙华骆永明 key laboratory of Energy Thermal Conversion and control of Ministry of Education(School of Energy and Environment Southeast University) key laboratory of soil Environment and pollution remediation(Institute of soil Science Chinese Academy of Sciences)

Sequential and single extraction procedures were applied to both fresh and dried Sedum Plumbizincicola leaves and *** extractants, different from those of soil, sediment or sewage sludge metal fractions, were water, 80%(v/v) ethanol, 1 mol/L Na Cl,2% HAc and 0.6 mol/L HCl. Zn, Cd and Cu in the extracts and samples were measured by flame atomic adsorption spectrometry. In sequential extraction procedures, water soluble form and ethanol soluble form are the main fractions for Zn, while water soluble form and Na Cl soluble form for Cd, and comparatively uniform distribution for Cu with the residue form most and HCl soluble form second. Single extraction procedures are used to compare the extraction efficiencies of the five reagents to screen appropriate extractants and operating conditions for liquid extraction to deal with large amount of harvested metal-contained biomass, which will pose a threat to the environment if treated improperly. The sequences of extraction efficiencies are HCl>Na Cl≈HAc>Water≈Ethanol for Zn and HCl≈Na Cl≈HAc>Water>Ethanol for Cd. As for Cu, all the five extractants cannot effectively extract Cu, but HCl achieves a higher efficiency(>70% in fresh samples, and 45%-60% in dried samples). Besides, extraction efficiencies for most extractants in fresh samples are higher than those in dried samples, and extraction efficiencies of stems and leaves for the five extractants are close. The two extraction procedures can obtain high degree of accuracy with the relative standard deviation(RSD)lower than 10%, and metal recoveries are controlled between 80%-120% with most of 90%-110%.

关键词： Sedum Plumbizincicola liquid extraction biomass disposal heavy metals

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Nano Fe_(2)O_(3)embedded in montmorillonite with citric acid enhanced photocatalytic activity of nanoparticles towards diethyl phthalate

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Journal of Environmental Sciences 2021年第3期33卷 248-259页

作者： Zhaoyue Sun Lisha Feng Guodong Fang Longgang Chu Dongmei Zhou Juan Gao key laboratory of soil Environment and pollution remediation Institute of Soil Science Chinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China State key laboratory of pollution control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Nano-Fe_(2)O_(3)embedded in montmorillonite particles(Fe-Mt)were prepared to degrade diethyl phthalate(DEP)with citric acid(CA)under xenon light *** to pristine montmorillonite(Na-Mt),the embedding process increased 14.5-fold of iron content and 1.8-fold of specific surface *** synthesized Fe-Mt have more oxygen vacancies than Fe_(2)O_(3)nanoparticles(nFe_(2)O_(3)),which could induce more reactive oxygen species(ROSs)generation in the presence of CA under xenon lamp ***-Mt with CA enhanced photo-assisted degradation of DEP 2.5 times as compared to nFe_(2)O_(3)with *** experiments,electron paramagnetic resonance(EPR)spectroscopy and identification of products confirmed that surface-bound·OH was the main radical to degrade *** anions(i.e.,NO_(3)-,CO_(3)^(2-),Cl^-)and humic acid could compete·OH with DEP and cause slower degradation of *** removal efficiency of DEP was more than 56%with Fe-Mt after three recycles,and the dissolved Fe concentration from Fe-Mt was below 75μmol/L,indicating Fe-Mt had a good stability as a ***-Mt together with CA appeared to be a promising strategy to remove organic pollutants in surface water,or topsoil under solar irradiation.

关键词： Heterogeneous catalyst Hydroxyl radical Photo-Fenton reactions Phthalate ester

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Conversion relationships between environmental quality criteria of water/air and soil

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Science China Earth Sciences 2018年第12期61卷 1781-1791页

作者： Yong TENG Qixing ZHOU key laboratory of pollution Processes and Environmental Criteria(Ministry of Education)/Tianjin key laboratory of Environmental remediation and pollution control College of Environmental Science and Engineering Nankai University

The conversion study on the environmental quality criteria between water/air and soil is the need to carry out research on soil-environmental quality standards in an all-round way, and also the demand for solving emerging problems in this field using the system dynamic and the overall view. Carrying out this study is of practical significance and theoretical values in the face of formulation and revision of soil-environmental quality standards in China. Firstly, the theoretical basis and relative models of soil-water and soil-air systems were expounded, respectively. And on this basis, a preliminary conceptual model about the conversion was constructed. After that, the current worldwide environmental quality criteria/standards for soil, water and air media were introduced based on their types, concerned pollutants and hierarchical classification, and their variation were also analyzed briefly. Particularlly, the key points for the conversion of environmental quality criteria between soil and water and/or between soil and air were discussed, respectively, while combined with the relative researching results. Finally, this conversion study was commented and prospected.

关键词： Environmental quality criteria soil-water system soil-air system Conversion

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Progress in enhancing the remediation performance of microbial fuel cells for contaminated groundwater

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Journal of Environmental Sciences 2024年第11期145卷 28-49页

作者： Yuan Liang Dong Yu Hui Ma Tao Zhang Yi Chen Naveed Akbar Shengyan Pu State key laboratory of Geohazard prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China State Environmental Protection key laboratory of Synergetic control and Joint remediation for soil&Water pollution Chengdu University of TechnologyChengdu 610059China

Microbial fuel cells(MFCs)have become more prevalent in groundwater remediation due to their capacity for power generation,removal of pollution,ease of assembly,and low secondary *** is currently being evaluated for practical application in an effort to eliminate groundwater ***,a considerable majority of research was conducted in *** the operational circumstances including anaerobic characteristics,pH,and temperature vary at different *** addition,the complexity of contaminants and the positioning of MFCs significantly affect remediation *** the aforementioned factors into consideration,this reviewsummarizes a bibliography on the application of MFCs for the remediation of groundwater contamination during the last ten decades and assesses the impact of environmental conditions on the treatment *** design of the reactor,including configuration,dimensions,electrodes,membranes,separators,and target contaminants are *** review aims to provide practical guidance for the future application of MFCs in groundwater remediation.

关键词： Microbial fuel cells(MFCs) Contaminated groundwater Groundwater remediation Biodegradation

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Toxicity and subcellular distribution of cadmium in wheat as affected by dissolved organic acids

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Journal of Environmental Sciences 2012年第5期24卷 903-911页

作者： Dandan Li Dongmei Zhou key laboratory of soil Environment and pollution remediation Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

We aim to investigate the effects of humic acid （HA） and citric acid （CA） on the toxicity and subcellular distribution of Cd in wheat. Results show that the toxicity and uptake of Cd decreased with increasing HA. The EC50 values of Cd increased from 3.36 μmol/L to 4.96 and 7.33 μmol/L at 50 and 250 mg/L HA, respectively, but decreased to 1.39 μmol/L in the presence of CA based on free ion activity model （FIAM）. HA decreased the relative subcellular distribution of Cd in the heat-denatured proteins （decreased from 54% to 33%） but increased Cd in the heat-stable proteins in root （from 25% to 50%） at 7.61 μmol/L {Cd2＋} （free Cd activity）, which resulted in decreasing Cd toxicity. However, CA increased Cd toxicity due to the increased internalization of Cd although the relative subcellular distributions of Cd exhibited a decrease in the heat-denatured proteins and increase in the granule fraction compared to the control at high-level Cd. The FIAM could not predict the toxicity of Cd in the presence of organic acids. Alternatively, the internal Cd accumulation and subcellular Cd concentration were better to describe the toxicity of Cd to wheat.

关键词： toxicity cadmium organic acid subcellular distribution

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Root-associated(rhizosphere and endosphere) microbiomes of the Miscanthus sinensis and their response to the heavy metal contamination

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Journal of Environmental Sciences 2021年第6期33卷 387-398页

作者： Xiaoxu Sun Benru Song Rui Xu Miaomiao Zhang Pin Gao Hanzhi Lin Weimin Sun National-Regional Joint Engineering Research Center for soil pollution control and remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China

The plant root-associated microbiomes, including both the rhizosphere and the root endosphere microbial community, are considered as a critical extension of the plant genome. Comparing to the well-studied rhizosphere microbiome, the understanding of the root endophytic microbiome is still in its infancy. Miscanthus sinensis is a pioneering plant that could thrive on metal contaminated lands and holds the potential for phytoremediation applications. Characterizing its root-associated microbiome, especially the root endophytic microbiome, could provide pivotal knowledge for phytoremediation of mine tailings. In the current study, M. sinensis residing in two Pb/Zn tailings and one uncontaminated site were collected. The results demonstrated that the metal contaminant fractions exposed strong impacts on the microbial community structures. Their influences on the microbial community, however, gradually decreases from the bulk soil through the rhizosphere soil and finally to the endosphere, which resulting in distinct root endophytic microbial community structures compared to both the bulk and rhizosphere soil. Diverse members affiliated with the order Rhizobiales was identified as the core microbiome residing in the root of M. sinensis. In addition, enrichment of plant-growth promoting functions within the root endosphere were predicted, suggesting the root endophytes may provide critical services to the host plant. The current study provides new insights into taxonomy and potential functions of the root-associated microbiomes of the pioneer plant, M. sinensis, which may facilitate future phytoremediation practices.

关键词： Tailing Miscanthus sinensis Root endosphere Metal(loid)s contamination

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