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451.
Huan Zhong Xinbin Feng Yongguang Yin Ze Wu Ping Li Yong Cai Shuxiao Wang 《环境科学学报(英文版)》2022,119(9):119-129
Mercury (Hg) in rice is drawing mounting concern since methylmercury (MeHg) was found capable of accumulating in rice. In-vitro bioaccessibility is a feasible and reliable method to assess the health effects of Hg in rice and has been utilized in a number of studies. This study was done to investigate the impact of cultivar, planting location, and cooking on the total mercury (THg) and MeHg bioaccessibility of rice, for which multiple statistical analysis methods were used to analyze the significance of their effects. The THg concentrations of rice samples taken from non-Hg contaminated areas of China were all below 15 ng/g and their MeHg concentrations were below 2 ng/g. Cooking could significantly reduce the MeHg bioaccessibility of rice because the MeHg was mainly combined with protein and the protein will be denatured during the cooking process, and then the denatured MeHg is difficult to be dissolved into the liquid phase. Indica- and japonica-type rice cultivars did not show significant differentiation in either the concentration of Hg or its bioaccessibility. However, the glutinous rice type differed significantly from the above rice types, and it showed greater bioaccessibility of THg and MeHg due to its distinct protein contents and starch properties. Planting location can affect the Hg concentration in rice and THg bioaccessibility but has a limited impact on MeHg bioaccessibility. Based on these results, two macro factors (rice cultivar, planting location) are presumed to impact Hg bioaccessibility by how they affect micro factors (i.e., Hg forms). 相似文献
452.
Ping Li Yong Cai Yongguang Yin Xin Zheng Jing Wang Chuanbing Zhang Yong Zhang Doudou Huang Shuxiao Yan Tengfei Sun Yuxiang Mao Xinbin Feng Shuxiao Wang Huan Zhong 《环境科学学报(英文版)》2022,119(9):130-138
Current knowledge about the transformation of total mercury and methylmercury (MeHg) in aerobic composting process is limited. In this study, the composition and transformation of mercury and dissovled organic matter (DOM) in aerobic composting process of municipal sewage sludge were were comprehensively characterized, and the differences among the three C/N ratio (20, 26 and 30) were investigated. The main form of mercury in C/N 20 and 26 was organo-chelated Hg (F3, 46%-60%); while the main form of mercury in C/N 30 was mercuric sulfide (F5, 64%-70%). The main component of DOM in C/N 20 and 26 were tyrosine-like substance (C1, 53%-76%) while the main fractions in C/N 30 were tyrosine-like substance (C1, 28%-37%) and fulvic-like substance (C2, 17%-39%). The mercury and DOM varied significantly during the 9 days composting process. Compared to C/N 20 and 26, C/N 30 produced the less MeHg after aerobic composting process, with values of 658% (C/N 20), 1400% (C/N 26) and 139% (C/N 30) of the initial, respectively. Meanwhile, C/N 30 produced the best compost showed greater degree of DOM molecular condensation and humification. Hg fraction had been altered by DOM, as indicated by a significant correlation between mercury species and DOM components. Notably, C/N 30 should be used as an appropriate C/N ratio to control the methylation processes of mercury and degration of DOM. 相似文献
453.
Pei Lei Yongguang Yin Wenli Tang Chao Tang Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li 《环境科学学报(英文版)》2022,119(9):166-174
Methylmercury (MeHg) production in paddy soils and its accumulation in rice raise global concerns since rice consumption has been identified as an important pathway of human exposure to MeHg. Sulfur (S) amendment via fertilization has been reported to facilitate Hg methylation in paddy soils under anaerobic conditions, while the dynamic of S-amendment induced MeHg production in soils with increasing redox potential remains unclear. This critical gap hinders a comprehensive understanding of Hg biogeochemistry in rice paddy system which is characterized by the fluctuation of redox potential. Here, we conducted soil incubation experiments to explore MeHg production in slow-oxidizing paddy soils amended with different species of S and doses of sulfate. Results show that the elevated redox potential (1) increased MeHg concentrations by 10.9%−35.2%, which were mainly attributed to the re-oxidation of other S species to sulfate and thus the elevated abundance of sulfate-reducing bacteria, and (2) increased MeHg phytoavailability by up to 75% due to the reductions in acid volatile sulfide (AVS) that strongly binds MeHg in soils. Results obtained from this study call for attention to the increased MeHg production and phytoavailability in paddy soils under elevated redox potentials due to water management, which might aggravate the MeHg production induced by S fertilization and thus enhance MeHg accumulation in rice. 相似文献
454.
Huan Zhong Ping Li Yongguang Yin Pei Lei Nan Zou Yujiao Liu Weiping Cai Mengjie Wu Wenli Tang Yong Cai Xinbin Feng Shuxiao Wang 《环境科学学报(英文版)》2022,119(9):78-92
Mercury (Hg) could be microbially methylated to the bioaccumulative neurotoxin methylmercury (MeHg), raising health concerns. Understanding the methylation of various Hg species is thus critical in predicting the MeHg risk. Among the known Hg species, mercury sulfide (HgS) is the largest Hg reservoir in the lithosphere and has long been considered to be highly inert. However, with advances in the analytical methods of nanoparticles, HgS nanoparticles (HgS NPs) have recently been detected in various environmental matrices or organisms. Furthermore, pioneering laboratory studies have reported the high bioavailability of HgS NPs. The formation, presence, and transformation (e.g., methylation) of HgS NPs are intricately related to several environmental factors, especially dissolved organic matter (DOM). The complexity of the behavior of HgS NPs and the heterogeneity of DOM prevent us from comprehensively understanding and predicting the risk of HgS NPs. To reveal the role of HgS NPs in Hg biogeochemical cycling, research needs should focus on the following aspects: the formation pathways, the presence, and the environmental behaviors of HgS NPs impacted by the dominant influential factor of DOM. We thus summarized the latest progress in these aspects and proposed future research priorities, e.g., developing the detection techniques of HgS NPs and probing HgS NPs in various matrices, further exploring the interactions between DOM and HgS NPs. Besides, as most of the previous studies were conducted in laboratories, our current knowledge should be further refreshed through field observations, which would help to gain better insights into predicting the Hg risks in natural environment. 相似文献
455.
Hui Liu Yongguang Yin Fenghua Shen Shudan He Junyuan Li Cao Liu Kaisong Xiang Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li 《环境科学学报(英文版)》2022,119(9):44-49
The presence of SO2 display significant effect on the mercury (Hg) adsorption ability of carbon-based sorbent. Yet the adsorption and oxidation of SO2 on carbon with oxygen group, as well as the roles of different sulfur oxide groups in Hg adsorption have heretofore been unclear. The formation of sulfur oxide groups by SO2 and their effects on Hg adsorption on carbon was detailed examined by the density functional theory. The results show that SO2 can be oxidized into SO3 by oxygen group on carbon surface. Both C-SO2 and C-SO3 can improve Hg adsorption on carbon site, while the promotive effect of C-SO2 is stronger than C-SO3. Electron density difference analyses reveal that sulfur oxide groups enhance the charge transfer ability of surface unsaturated carbon atom, thereby improving Hg adsorption. The experimental results confirm that surface active groups formed by SO2 adsorption is more active for Hg adsorption than the groups generated by SO3. 相似文献
456.
Peng Liang Yongguang Yin Huawei Zhang Yifan Zhou Ting Liu Xiaopeng Tian Yuhan Zhang Juan Wang Mingzhu Zhang Thipphasone Phoutthavong Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li 《环境科学学报(英文版)》2022,119(9):23-32
Co-pyrolysis of coal and seaweed can not only effectively decrease the carbon footprint but also improve the quality and output of coal pyrolysis products, however, the influence of seaweed on thermal releasing behaviors of mercury during co-pyrolysis process are still unclear. In this work, the chlorella and Guizhou bituminous coal were mixed and used to reveal the mercury release behavior during co-pyrolysis by the temperature programmed pyrolysis experiments, thermogravimetric and differential thermogravimetric analysis (TG-DTG) and thermogravimetry-mass spectrometry (TG-MS) methods, offering a sufficient explanation on the control technology of mercury pollutants in co-pyrolysis. The results exhibited that a large amount of reducing gases such as CO, H2 and H2O were generated in chlorella at the temperature range of 100-500°C, which was favorable for the transformation from oxidized mercury to elemental mercury, thus remarkably increased the release of elemental mercury in the raw coal sample. The mixed chlorella also significantly lowered the decomposition temperature range (from 400-600 to 300-400°C) of pyrite-bound mercury and decreased the decomposition temperatures of the pyrite-bound mercury species. Additionally, in the co-pyrolysis about 91.82% of mercury was released into the gas phase below 400°C and was 13.77% higher than that of in individual pyrolysis of coal. 相似文献
457.
在固定床反应器上研究了反应温度和烟气组分对Ce-W/TiO2(物质的量比Ce:W=2:1)催化剂脱硝协同脱汞活性的影响.结果表明:反应温度对该催化剂的脱硝脱汞效率影响显著,在280~400℃温度区间,脱硝效率随温度升高而升高,而脱汞效率在温度为280℃与360℃的条件下较高,360℃时兼具最好的脱硝与脱汞效率.在SCR气氛中,HCl对Hg0的氧化脱除有极大的促进作用,低浓度的HCl也有利于脱硝效率的提高,但HCl浓度过高对NO的脱除有抑制作用;SO2的存在对脱硝过程可起到促进作用,对Hg0的氧化有抑制作用.利用BET,XRD,SEM,TPD,XRF,NH3-TPD等分析手段对反应前后催化剂进行表征,结果表明:Ce-W/TiO2无微孔结构,活性组分CeO2和WO3以高度分散的形式分布于载体表面.280℃条件下部分Hg以HgCl2的形式吸附于反应后催化剂表面,随着反应温度的升高催化剂表面吸附态的汞急剧降低.SCR气氛中的HCl与SO2会影响催化剂表面酸性,同时增加Cl和S元素含量,进而影响该催化剂的脱硝与脱汞效率. 相似文献
458.
Assessing the capacity of biochar to stabilize copper and lead in contaminated sediments using chemical and extraction methods 总被引:1,自引:0,他引:1
Mingming Wang Liangsuo Ren Dayang Wang Zuansi Cai Xuefeng Xi Aizhong Ding 《环境科学学报(英文版)》2019,31(5):91-99
Because of its high adsorption capacity, biochar has been used to stabilize metals when remediating contaminated soils; to date, however, it has seldom been used to remediate contaminated sediment. A biochar was used as a stabilization agent to remediate Cu- and Pb-contaminated sediments, collected from three locations in or close to Beijing. The sediments were mixed with a palm sawdust gasified biochar at a range of weight ratios (2.5%, 5%, and 10%) and incubated for 10, 30, or 60?days. The performance of the different treatments and the heavy metal fractions in the sediments were assessed using four extraction methods, including diffusive gradients in thin films, the porewater concentration, a sequential extraction, and the toxicity characteristic leaching procedure. The results showed that biochar could enhance the stability of heavy metals in contaminated sediments. The degree of stability increased as both the dose of biochar and the incubation time increased. The sediment pH and the morphology of the metal crystals adsorbed onto the biochar changed as the contact time increased. Our results showed that adsorption, metal crystallization, and the pH were the main controls on the stabilization of metals in contaminated sediment by biochar. 相似文献
459.
Methylsiloxanes are a class of silicone compounds that have been widely used in various industrial processes and personal care products for several decades. This study investigated the spatial distribution of three cyclic methylsiloxanes (D4–D6) and twelve linear methylsiloxanes (L5–L16) in mollusks collected from seven cities along the Bohai Sea. D4–D6 (df?=?71%–81%) and L8–L16 (df?=?32%–40%) were frequently detectable in the mollusk samples, while L5–L7 were not found in any mollusk samples. Cyclic methylsiloxanes (D4–D6) were found in mollusks with the mean concentrations of 15.7?±?12.3?ng/g ww for D4, 24.6?±?15.8?ng/g ww for D5 and 34.0?±?23.0?ng/g ww for D6. Among the seven sampling cities, the cyclic methylsiloxanes were predominant in mollusks, with the total cyclic methylsiloxanes (sum of D4–D6, ∑ CMS) accounting for 74.2%–80.7% of the total methylsiloxanes. ∑ CMS along the coastline demonstrated a clear gradient, with the highest concentrations in mollusks at the sampling sites located in the western part of the Bohai Sea and the lowest concentrations in mollusks from cities located in the eastern part of the Bohai Sea. The biota-sediment accumulation factors for cyclic methylsiloxanes (D4–D6) and linear methylsiloxanes (L8–L16) were estimated as 0.42?±?0.06–0.53?±?0.06 and 0.13?±?0.03–0.19?±?0.05, respectively. 相似文献
460.