FOOD CONTROL
·
2024
·
IF 5.6
Wenjie Lu,Xiaoli Dai,Renqing Yang,Zeyan Liu,Haili Chen,Yanfeng Zhang,Xinai Zhang
Pomegranate is very favored but highly susceptible to lead contamination that threatens consumer health, and thereby it is essential to establish efficient modes to monitor lead level in pomegranate. A specific and sensitive electrochemical sensor was developed for assessing lead pollution in pomegranate based on Pb 2+ -dependent DNAzyme as recognition receptor and metal-organic frameworks (MOFs) for signal output. Particularly, the used MOFs exhibited Fenton-like catalytic functions toward methylene blue (MB) as electroactive medium. Integrating with gold nanoparticles (AuNPs), the Fenton-like MOFs showed high sensitivity for electrochemical detection of Pb 2+ in pomegranate. Moreover, benefiting from the specific recognition of DNAzyme to Pb 2+ , the adjustable strategy was achieved, in which the approaching MB led to a higher signal with the absence of Pb 2+ while the detached MB gave rise to a lower signal with the presence of Pb 2+ . With the use of Fenton-like catalytic MOFs driving electrochemical aptasensing interface, this simplified detection pattern was endowed with sensitive assessment of lead pollution level in pomegranate, highlighting its promising potential in evaluating the safety of foodstuffs.
研究领域:
食品安全检测
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环境科学
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生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Shangqi Ge,Wenhao Jiang,Lingwei Zheng,Xinyu Xie,Yize Pan
High concentrations of lead in soil will greatly weaken the stabilization/solidification effect. Humin (HM) is expected to improve this process because it is a neutral, insoluble, porous and green material as well as an eco-friendly adsorbent extracted from natural peat soil . However, HM has not been studied with respect to the stabilization/solidification (S/S) characteristics of potentially toxic element (PTE)-contaminated soil due to its different extraction sources and methods, as well as complex properties. To study these effects, insoluble HM was extracted for treatment of high-lead contaminated soil by cement-based S/S. The experimental results show that HM has a strong adsorption capacity for lead with a maximum adsorption capacity of 200.2 mg kg −1 . The negative influence of a high content of lead on the compressive strength over a 0–90-day period is weakened after adding HM to the soil, wherein a competitive mechanism between HM and a high concentration of lead is proposed. The lead leaching concentration of stabilized soil is significantly decreased under different leaching methods from 0 to 60 days and then decreases slowly. The lead speciation results for the stabilized soil determined through the Tessier sequential extraction method show that HM promotes the gradual chemical transformation of lead from exchangeable and carbonate-bound fractions to a more stable state, with respective decreases of 27.5% and 15.1%. In addition, SEM-EDS images show that HM with a high porosity and specific surface area coexists well with cement, which promotes the stabilization of lead. In conclusion, HM contributes to decreasing the mobility and bioavailability of lead and achieving environmental remediation.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2013
·
IF 3.137
Jing Wei,Xiaoyan Liu,Qian Wang,Chuanhua Wang,Xueping Chen,Hongbing Li
Phytoremediation for PAH hydrocarbons has been widely studied, but few focus on the influence of rhizodeposition on their bioaccessibility during the process. This literature revealed the effect of celery ( Apium graveolens ) rhizodeposition on pyrene fractionation and bioaccessibility in simulated pyrene and pyrene–lead contaminated microcosms. A sequential extraction methodology was used to quantify different morphological fractions of pyrene in the soil, and phospholipid fatty acid (PLFA) pattern to monitor shifts in microbial populations. Bioaccessible pyrene accounted for the largest proportion of the total removal. Biodegradation of both bioaccessible and associated pyrene fractions was enhanced by celery rhizodeposition in pyrene spiked soils. However, rhizodeposition promoted the removal of bioaccessible rather than associated fractions in pyrene–lead spiked soils. In contrast, the bound fraction increased over time in pyrene spiked soils without amendment, but kept relatively stable in amended microcosms. It was found that rhizodeposition facilitated the reproduction of all the subgroups of soil microorganisms through PLFA analysis. Although all the subgroups contributed to the removal of bioaccessible pyrene, only abundances of unsaturated and cyclic fatty acids were positively correlated with the removal of associated pyrene. These findings provide meaningful insights into the microecological mechanisms involved in the phytoremediation of PAH polluted sites.
研究领域:
环境科学
·
土壤生态学
·
植物修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Kuo Liu,Yulin Wu,Lining Zheng,Xian Wu,Hao Zhang
Microbial remediation is an eco-friendly and cost-effective approach to mitigate the environmental risks caused by fomesafen (FSA) and lead (Pb). In this study, a novel strain, Acidovorax temporans LK1, was isolated and demonstrated the ability to degrade 97.5 % of FSA within 2 d. Strain LK1 achieved simultaneous removal rates of 68.6 % for FSA and 38.4 % for Pb within 48 h. The effectiveness of strain LK1 in addressing FSA and Pb co-contamination was further validated by flow cytometry and energy-dispersive spectroscopy (EDS). Analysis of the degradation products revealed potential FSA degradation pathways, including nitro reduction, S-N bond cleavage, C-N bond cleavage, and ether bond cleavage. Over 21 d, strain LK1 removed more than 70 % of FSA and 40 % of Pb from the soil, significantly reducing the combined pollution stress on sweet corn and demonstrating its high efficacy under real-world conditions. Metabolomic analysis revealed that strain LK1 employed a series of metabolic reactions to maintain the intracellular metabolic balance, enabling efficient FSA degradation. These findings highlight the significant potential of strain LK1 for bioremediation, offering a novel solution for addressing the agricultural challenges associated with FSA and Pb co-contamination.
研究领域:
环境微生物学
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污染生态学
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生物修复
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环境毒理学
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分子生态学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Shangqi Ge,Yize Pan,Lingwei Zheng,Xinyu Xie
Stabilization/solidification (S/S) has been studied since 1950s and widely used for the treatment of potentially toxic elements (PTEs). The coexistence of organic matter (OM) and PTEs can cause a very complicated mechanism for cement-based S/S applications and bring challenges from both scientific and engineering perspectives. To fill in the knowledge gap, this paper investigates for the first time the effects on S/S characteristics of OM components and incubation, which are the two main factors that result in the inconsistency in the leaching characteristics from the available studies. OM samples with different components (humic acid (HA) and fulvic acid (FA)) and contents were mixed into lead-contaminated soil and incubated for different durations of up to 90 days. The experimental results show that the strength of stabilized soils increases with increasing incubation duration and the lead leaching concentration of stabilized soils is decreased by 60.7%–83.6% from zero to 90 days. The lead leaching concentration of the HA group, which is 144.0% higher with no incubation than the non-OM group, becomes 58.3% lower with 90 days of incubation. The leaching concentration of the FA group remains much higher than those of the other groups. Finally, a competing mechanism of HA—weakening cement hydration reactions and stabilizing lead with a critical incubation duration of 14 days—is proposed, together with a cooperating mechanism of FA—weakening cement hydration reactions and releasing lead.
研究领域:
环境科学
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土木工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Yang Liu,Chengdong Xu,Feiyan Liu,Gexin Xiao,Shaoqi Zhou,Liming Huang,Ni Lin,Jianyi Li,Dong Chen,Qi Fu,Huijun Wang,Qingfeng Du
Children's exposure to lead is a global health problem, especially in low- and middle-income countries. However, research on the relationship between children's blood lead levels (BLLs) and the development of the lead industry is still limited. This study examined whether children's BLLs were associated with the development of lead industry in different regions. Using survey data on the BLLs of children living in 250 prefectures in China with corresponding data on their economic factors and lead industries, we explored the regional variation of children's BLLs using statistical methods. The results show that the level of economic development in leaded areas was associated with inequity in children's BLLs and met the environmental Kuznets hypothesis. In areas without lead industries, there was little correlation between the level of economic development and the BLLs of children and thus the environmental Kuznets hypothesis was not supported. Lead mines, lead smelting and chemical companies are major sources of blood lead in children living in leaded areas. This study demonstrated the success of control policies for lead-acid battery manufacturers in promoting the prevention and control of childhood lead poisoning in China. China should consciously support the improvement of children's BLLs in undeveloped areas with lead industries through national financing and policies to avoid the continuous effects of the regional inequality problem of high children's BLLs.
研究领域:
公共卫生
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环境医学
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流行病学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Earth Sciences
·
2022
·Vol. 81
·期 21
·1-19
·
IF 3.119
An Xiaoyu,Zuo Dianjun,Wang Fei,Liang Chao
The cement solidification/stabilization method of heavy metal contaminated soils has been promoted in engineering practice and applied on a large scale for site remediation, but it still reveals some scientific problems in the current complex and variable global extreme climate. To solve these problems, this study used waste soda residue as a composite additive, and established an innovative composite model (cement-soda) to remediate lead-contaminated soil. The innovative composite model for unconfined compressive strength (UCS) and toxic leaching properties under different conditions were investigated As well as curing and leaching mechanisms are discussed, and future industrial practice was evaluated. The results showed that the addition of soda residue improved the early (20 days) UCS of the composite curing agent for lead-contaminated soil by an average of 23.1% MPa. The UCS strength was 0.96 MPa, which was the maximum when the percentage of soda residue composite was 40%. The concentration of Pb 2+ in the leachate of the cement-soda residue (CSH) composite curing agent was greatly reduced (average 3.28 times) compared with that of a single cement in the same situation, with an average leached Pb 2+ concentration of 1.87 mg·L −1 . This finding indicates that the addition of alkali residue improved the curing effect. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction between the CSH composite and soil particles. The leaching mechanism of CSH to aqueous solution is mainly the consumption of acid ions by alkaline substances. Collectively, this study will provide scientific data to support potential lead-containing soil in site remediation technologies and future large-scale engineering applications.
研究领域:
环境科学
·
土壤修复
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2022
·
IF 5.64
Hao Zhang,Jue Kou,Chunbao Sun,Peilong Wang,Jiawei Lin,Jinlin Li,Yongliang Jiang
Pb(II)-containing tailings are serious hazards to the environment. Their rationalization and harmless treatment are of great significance to the construction of the green mine. Cemented paste backfill (CPB) plays an important role in the large-scale disposal of tailings. However, Pb(II) in tailings harms the hydration reaction of ordinary Portland cement (OPC), thus reducing the early strength of CPB. The smooth running of mining was hampered. Besides, CPB is also essential for the effective immobilization of Pb(II). In this study, carbon nanotubes (CNTs) were used to optimize the properties of CPB. The influence of CNTs on OPC hydration and the phase composition of hydration products were studied by isothermal calorimeter test, X-Ray diffraction, and thermogravimetry analysis. The property changes of CPB, including flowability and strength development, caused by CNTs were investigated. The hydration of OPC was accelerated when CNTs were added. And more hydration gels generated to form a more compact structure of CPB. Due to the denser structure and more hydration gels caused by the CNTs, as well as the adsorption of Pb(II) on CNTs, the early strength of CPB was improved. And the Pb(II) immobilization was enhanced.
研究领域:
环境工程
·
材料科学
·
矿业工程
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固体废物处理
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重金属污染控制
·
可持续采矿
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）