FUEL
·
2016
·
IF 3.611
Shunlin Tang,Lina Wang,Xinbin Feng,Zhaohui Feng,Ruiyang Li,Huipeng Fan,Ke Li
Mercury species distribution in the flue gas from three typical coal-fired power plants have been investigated using a C-5000 sampler for Ontario Hydro Method (OHM) to evaluate specified Hg emission inventories in the largest coal-production province of China, Inner Mongolia. The feed coal, bottom ash, fly ash and gypsum have also been sampled in the field. Mercury emissions are in the dominant form of Hg 0 (>85%). The Hg 2+ (<15%) and the Hg p (<2%) emissions are minor fractions of Hg t in the flue gas. The wet limestone flue gas desulfurization device (WLFGD) showed much higher removal efficiency for Hg 2+ (87–95%) than for the other two Hg species. The input Hg/output Hg varied from 92% to 115% for the tested 3 coal-fried utility boilers during sampling time. We obtained comprehensive Hg discharge factors, including direct atmospheric Hg emission factors and indirect discharge factors of Hg associated with bottom ash, fly ash and gypsum, to the environment, designating the fates of Hg in coal. We estimated the Hg discharges from coal-fired power plants in Inner Mongolia in 2008–2014 and expanded to China. The maximum of direct Hg emissions from coal-fired power plants of Inner Mongolia was 24 Mg in 2012. The Chinese coal-fired power plants emitted directly 100 Mg Hg to the atmosphere every year at the nationwide air control actions. The maximum discharges of Hg associated with fly ash and gypsum of Inner Mongolia was 81 Mg and 11 Mg in 2012, respectively. The national Hg discharges with fly ash and gypsum every year are respectively about 300 Mg and 82 Mg, majority of which may be reemitted to the atmosphere by the utilization industry. Therefore, mercury emissions from coal-fired power plants are not the largest single source of Hg to the atmosphere in normal operation of the current efficient denitrification, particles control and desulfurization devices. Instead, the utilization industry of fly ash and gypsum would be emitting more Hg to the atmosphere.
研究领域:
环境科学
·
能源与动力工程
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产品关联
DOI
高影响因子
FUEL
·
2014
·
IF 3.406
Mingyang Sun,Jiaai Hou,Guanghuan Cheng,Shams Ali Baig,Lisha Tan,Xinhua Xu
Multipurpose utilization of flue gas desulfurization (FGD) gypsums releases mercury into environment and poses threats to public health. Determining Hg speciation is essential not only for predicting its toxicity and mobility but also for designing effective remediation strategies. Sequential chemical extraction (SCE) method was used to analyze Hg speciation in this study. The total Hg concentration in four samples ranged from 0.61 to 1.63 μg/g. XRD and EDX analysis revealed that the main chemical composition of FGD gypsum was calcium sulfate (CaSO 4 ). SCE result indicated that Hg was mainly distributed in the strong complex phase, ranging from 60% to 80%. Water soluble mercury in Sample SX accounted for 30% of the total extract, which might be attributed to the relatively high chlorine content in coal. Moreover, the mobility of Hg from FGD gypsum was also investigated in this study, which exhibited biphasic kinetics. The rapid release of Hg was related to the ratio of water soluble Hg at some extent ( R 2 = 0.818), which signified of more attentions for its stabilization. This study also suggested theoretical framework for the environmental risk associated with FGD gypsum during its usage and disposal.
研究领域:
环境科学
·
化学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Xiaopan Chen,Chao Han,Heyong Cheng,Jinhua Liu,Zigang Xu,Xuefeng Yin
This work demonstrated the feasibility of mercury speciation analysis by anion exchange chromatographic separation with inductively coupled plasma mass spectrometry detection. For the first time, by complexing with the mobile phase containing 3-mercapto-1-propanesulfonate into negatively charged complexes, fast separation of inorganic mercury (Hg 2+ ), monomethylmercury (MeHg), ethylmercury (EtHg) and phenylmercury (PhHg) was achieved within 5 min on a 12.5-mm strong anion exchange column. The detection limits for Hg 2+ , MeHg, EtHg and PhHg were 0.008, 0.024, 0.029 and 0.034 μg L −1 , respectively. The relative standard deviations of peak height and peak area (5.0 μg L −1 for each Hg species) were all below 3%. The determined contents of Hg 2+ , MeHg and total Hg in a certified reference material of fish tissue by the proposed method were in good accordance with the certified values with satisfactory recoveries. The relative errors for determining MeHg and total mercury were −2.4% and −1.2%, respectively, with an acceptable range for spike recoveries of 94–101%. Mercury speciation in 11 fish samples were then analyzed after the pretreated procedure. The mercury contents in all fish samples analyzed were found compliant with the criteria of the National Standards of China.
研究领域:
环境科学
·
分析化学
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DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Yuan Yang,Qing Tan,Yao Lin,Yunfei Tian,Li Wu,Xiandeng Hou,Chengbin Zheng
Speciation analysis of mercury in hair facilitates accurate evaluation of mercury exposure to humans and insights into the intertransformation of different mercury species in the human body. However, conventional hyphenated techniques used for mercury speciation analysis usually require expensive instruments and a complex interface. In this work, a compact and miniaturized point discharge (PD) atomic emission spectrometer was utilized as a detector of gas chromatography for the speciation analysis of mercury. Mercury species extracted from hair were derivatized to their volatile species with NaBEt4 and subsequently preconcentrated by headspace solid-phase microextraction (HS-SPME) prior to their speciation analysis. Under the optimized conditions, limits of detection of 0.35 μg kg–1 (0.035 ng) and 1.0 μg kg–1 (0.10 ng) were obtained for IHg and MeHg, respectively, with a relative standard deviation (RSD) of better than 3.5%. Because of the compact and miniature conformation, high excitation capability, low power consumption of PD-OES, and efficient preconcentration of mercury species by HS-SPME, the proposed system not only overcomes the shortcomings associated with the conventional hyphenated techniques but also provides several unique advantages, including significant simplification of experimental setup, reduction of dead volume, and improvement of sensitivity. The accuracy of this system was validated by speciation analysis of mercury in a Certified Reference Material (GBW09101b, human hair) and 10 human hair samples collected from different people in the population.
研究领域:
环境科学
·
分析化学
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DOI
PubMed
高影响因子
BIOLOGICAL TRACE ELEMENT RESEARCH
·
2018
·Vol. 186
·期 2
·554-561
·
IF 2.361
Liu Hao,Luo Jiaoyang,Ding Tong,Gu Shanyong,Yang Shihai,Yang Meihua
In this paper, a simple and cost-effective method using high-performance liquid chromatography in conjunction with inductively coupled plasma mass spectrometry with a rapid ultrasound-assisted extraction was used for analysis speciation of trace mercury in sea cucumber species of Apostichopus japonicus . The effective separation of inorganic mercury, methylmercury, and ethylmercury was achieved within 10 min using Agilent ZORBAX SB-C 18 analytical and guard columns with an isocratic mobile phase consisting of 8% methanol and 92% H 2 O containing 0.12% L-cysteine ( m / v ) and 0.01 mol/L ammonium acetate. Mercury species were extracted from A. japonicus samples using a solution containing 2-mercaptoethanol, L-cysteine, and hydrochloric acid and sonicating for 0.5 h. The limits of detection of inorganic mercury, methylmercury, and ethylmercury were 0.12, 0.08, and 0.20 μg/L, and the minimum detectable concentrations (measured at 0.500 g sample volume in 10.00 mL) were 2.4, 1.6, and 4.0 μg/kg, respectively. Analysis of a scallop certified reference material (GBW 10024) revealed accordance between the experimental and certified values. This study provides a reference for the evaluation of mercury speciation in sea cucumber and other seafood.
研究领域:
海洋生物学
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食品科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Heyong Cheng,Chunling Wu,Lihuan Shen,Jinhua Liu,Zigang Xu
A hyphenated method for mercury speciation analysis by the coupling of high performance liquid chromatography and inductively coupled plasma mass spectrometry with the online strong anion exchange column (SAX) preconcentration was developed. The Hg analytes (Hg + , MeHg, EtHg and Hg 2+ ) were absorbed on the SAX column preconditioned with sodium 3-mercapto-1-propanesulfonate, and then rapidly eluted (less than 16 s) by 5 μL 3% (v/v) 2-mercaptoethanol. The enrichment factors of 1025 for Hg + , 1084 for MeHg, 1108 for EtHg and 1046 for Hg 2+ were obtained using 6 mL sample in a 1.5-min enrichment procedure. Rapid separation of the four mercurial compounds was achieved within 5 min on a 50-mm C 18 column using 0.5% (v/v) 2-mercaptoethanol as the mobile phase. The detection limits for Hg + , MeHg, EtHg and Hg 2+ were 0.015, 0.010, 0.009 and 0.016 ng L −1 , each, and the relative standard deviations of peak height and peak area (5 ng L −1 for each Hg species) were all below 5%. Mercury speciation in three freshwater, two drinking water and two seawater samples were then analyzed by the proposed method. MeHg and Hg 2+ concentrations down to 0.14 and 0.56 ng L −1 were detected in the drinking waters.
研究领域:
分析化学
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环境科学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Yuping Xiang,Yueqian Chen,Yingying Guo,Yanwei Liu,Guangliang Liu,Yongguang Yin,Dingyong Wang,Yong Cai,Guibin Jiang
How organic ligands regulate microbial Hg(II) bioavailability remains a critical knowledge gap in elucidating methylmercury production and subsequent bioaccumulation in biota. Six model ligands with different functional groups (ethylenediaminetetraacetate [EDTA], citrate [CTA], cysteine [CYS], glutathione [GSH], 2, 3-dimercapto-1-propanesulfonate [DMPS], and 3-mercapto-1-propanesulfonate [MPS]) were applied to probe their impacts on Hg(II) bioavailability, by direct measurement of active cellular Hg(II) and cell physiology using a Hg(II)-specific ( Escherichia coli PRL) and a constitutive biosensor ( E. coli PJL), respectively. Hg(II) uptake was significantly inhibited by EDTA, CTA, DMPS, and MPS, whereas enhanced by CYS and GSH. These findings indicate co-occurred uptake mechanism other than the widely accepted membrane-ligand exchange model, since bioavailability did not inversely correlate with Hg-binding strength (CTA < EDTA < GSH < CYS < DMPS). Furthermore, ligand-induced bacterial physiological changes (e.g., thiolate inhibition vs. carboxylate neutrality) were not the primary driver of bioavailability variations. Based on Hg(II) speciation analysis and thermodynamic modelling, it was implied that sulfate reduction and CYS degradation generated sulfide corona near bacterial cells, promoting the formation of Hg sulfide nanoparticles (HgS NP ) or Hg-S clusters during Hg(II) uptake. Enhanced bioavailability of Hg(II)-CYS/GSH likely arose from passive diffusion and intracellular dissolution of these HgS species. Ambient oxygen levels further modulate Hg(II) bioavailability, with enhanced Hg(II)-CYS uptake observed under anoxic conditions, likely due to oxygen-dependent transporters expression and bacterial metabolisms. Overall, these findings highlight ligand-specific mechanisms governing Hg(II) bioavailability, emphasizing the interactions of Hg-binding strength, cell physiology, and sulfide-driven speciation in Hg biogeochemical cycling.
研究领域:
环境微生物学
·
生物地球化学
·
环境化学
·
微生物生理学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Xiaoyu Jia,Junyi Zhao,Hongyun Ren,Jiani Wang,Zixiao Hong,Xian Zhang
Zwitterion-functionalized polymer microspheres (ZPMs) have been designed and used as the core adsorbent for the selective and rapid enrichment of mercury species in environmental waters by an on-line solid-phase extraction (SPE). Zwitterionic S-ZPMs and N-ZPMs having an anionic sulfonic group, but differing in cationic S + and N + moieties were prepared from Merrifield resin by treating with 1,2-ethanedithiol and imidazole , followed by modification with 1,3-propanesultone. Without any additional reagents, inorganic mercury (In-Hg), methylmercury (MeHg) and ethylmercury (EtHg) were quantitatively adsorbed on the home-made mini-column packed with ZPMs. Following extraction with 60 mM ammonium acetate and 0.15% L -cysteine ( L -Cys) solution within seconds, separation and speciation of mercury were successfully achieved by the HPLC–ICP-MS technique. Under the optimized experimental conditions, the enrichment factors (EFs) are up to 105 and 98 for inorganic and organic mercury only with 40 mL sample solution, respectively. The low detection limits of 0.78 ng L −1 , 0.63 ng L −1 , and 0.49 ng L −1 were reached for In-Hg, MeHg and EtHg, respectively, with the relative standard deviations (RSDs) below 4.1%. The feasibility and accuracy of the on-line SPE–HPLC–ICP-MS method were successfully applied for mercury speciation in surface water, seawater as well as certified reference material (CRM). The results here demonstrate a facile, sensitive and selective method for speciation of mercury at trace levels.
研究领域:
分析化学
·
环境科学
·
化工工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）