ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Qingsheng Bai,Qingcun Li,Jingfu Liu
The potential risk of various silver-containing nanoparticles (AgCNPs) in soils is related to the concentration, size, and speciation, but their determination remains a great challenge. Herein, we developed an effective method for determining the particle number, size, and species of dominant AgCNPs in soils, including nanoparticles of silver (Ag NPs), silver chloride (AgCl NPs), and silver sulfide (Ag2S NPs). By ultrasonication wand-assisted tetrasodium pyrophosphate extraction, these AgCNPs were extracted efficiently from soils. Then, multistep selective dissolution of Ag NPs, AgCl NPs, and whole Ag NPs/AgCl NPs/Ag2S NPs was achieved by 1% (v/v) H2O2, 5% (v/v) NH3·H2O, and 10 mM thiourea in 2% (v/v) acetic acid, respectively. Finally, the particle number concentration and size distribution of AgCNPs in the extracts and the remaining AgCNP particle number concentration after each dissolution were determined by single-particle inductively coupled plasma mass spectroscopy for speciation of the dominant AgCNPs. AgCNPs were detected in all five soil samples with the concentrations of 0.23–8.00 × 107 particles/g and sizes of 16–110 nm. Ag2S NPs were the main form of AgCNPs in the examined soils with the percentage range of 53.98–69.19%, followed by AgCl NPs (11.42–23.31%) and Ag NPs (7.78–16.19%). Our method offers a new approach for evaluating the occurrence and potential risk of AgCNPs in environmental soils.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Wen-Jing Wei,Lei Li,Yu-Pei Gao,Qiang Wang,Yao-Yu Zhou,Xin Liu,Yuan Yang
Plants can absorb and accumulate engineered nanomaterials (ENMs) through water and soil, providing a potential way for nanoparticles to be enriched in humans through the food chain. In this paper, a combination of enzymatic digestion method and SP-ICP-MS analysis was used to quantitatively characterize the enriched AuNPs in mustard and lettuce plants. The results showed that Macerozyme R-10 enzyme can extract AuNPs from plants without obvious aggregation/dissolution. Both mustard and lettuce plants can absorb and enrich the complete AuNPs to the above-ground organs, and the particle number concentrations detected are 1.24 × 10 7 particles L −1 and 4.39 × 10 7 particles L −1 , respectively. With different exposure level of AuNPs(0.5 mg L −1 ,), a particle number concentration of 2.32 × 10 7 particles L −1 was detected in the stems of lettuce plants, while the mustard failed to transport AuNPs to the above-ground organs. The transport efficiency of Au ions by plants is higher than that of AuNPs, and the plants have stronger bioavailability for ions.
研究领域:
植物学
·
环境科学
·
纳米毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 9
·3946-3955
·
IF 3.069
Huiling Zhang,Yuxiong Huang,Jianqiang Gu,Arturo Keller,Yuwei Qin,Yue Bian,Kun Tang,Xiaolei Qu,Rong Ji,Lijuan Zhao
Green synthesis of metallic nanoparticles (NPs) using plant extracts has received considerable attention due to its environmentally and economically friendly nature. Various metabolites in plants such as amino acids, organic acids, sugars and phenolic compounds have been speculated to be responsible for the synthesis of metallic NPs in previous studies. However, to date, there has been a lack of direct evidence linking specific metabolites to the reduction of metal ions to form metallic NPs. Here, AgNPs are synthesized using cucumber leaf extract and characterized by UV-visible spectroscopy, dynamic light scattering (DLS) and transmission electron spectroscopy (TEM). Single particle inductively coupled plasma mass spectrometry (sp-ICP-MS) was used to investigate the size of newly synthesized NPs as well as the kinetics of particle formation. Gas chromatography–mass spectrometry (GC-MS) based metabolomics identified and quantified 245 metabolites in cucumber leaf extracts. By comparing the concentrations of metabolites before and after the reaction, the metabolites responsible for the synthesis were screened out. Reducing sugars (cellobiose, ribulose-5-phosphate, melibiose, 2-deoxy-D-glucose, tagatose, fructose, ribose, 3,6-anhydro-D-galactose) were markedly decreased after the reaction, indicating that reducing sugars are involved in the biosynthesis process and possibly function as reducing agents. The key thermodynamic data of the reaction between Ag+ and reducing sugars were obtained by using isothermal titration calorimetry (ITC), which further confirmed the interaction between Ag+ and metabolites. This study provides a deep insight into the reaction process and mechanism of green synthesized AgNPs.
研究领域:
环境科学
·
纳米生物学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Weiping Cai,Yujun Wang,Yu Feng,Peng Liu,Shuofei Dong,Bo Meng,Hua Gong,Fei Dang
Nanoparticulate mercury (Hg-NPs) are ubiquitous in nature. However, the lack of data on their concentration in soils impedes reliable risk assessments. This is due to the analytical difficulties resulting from low ambient Hg concentrations and background interferences of heterogeneous soil components. Here, coupled to single particle inductively coupled plasma-mass spectrometry (spICP-MS), a standardized protocol was developed for extraction and quantification of Hg-NPs in natural soils with a wide range of properties. High particle number-, particle mass-, and total mass-based recoveries were obtained for spiked HgS-NPs (74–120%). Indigenous Hg-NPs across soils were within 107–1011 NPs g–1, corresponding to 3–40% of total Hg on a mass basis. Metacinnabar was the primary Hg species in extracted samples from the Wanshan mercury mining site, as characterized by X-ray absorption spectroscopy and transmission electron microscopy. In agreement with the spICP-MS analysis, electron microscopy revealed comparable size distribution for nanoparticles larger than 27 nm. These indigenous Hg-NPs contributed to 5–65% of the measured methylmercury in soils. This work paves the way for experimental determinations of indigenous Hg-NPs in natural soils, which is critical to understand the biogeochemical cycling of mercury and thereby the methylation processes governing the public exposure to methylmercury.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
·
2020
·
IF 3.086
Yupin Cao,Jinsu Feng,Lifu Tang,Guichun Mo,Weiming Mo,Biyang Deng
A new method for simultaneously determining cytokeratin fragment antigen 21–1 (CYFRA21-1), carcinoembryonic antigen (CEA), and carbohydrate antigen (CA15–3) was developed using single-particle, ICP-MS-based, magnetic immunoassay . Gold nanoparticles (AuNPs), ZnSe quantum dots (QDs), and Silver nanoparticles (AgNPs) were employed to tag antibodies. A highly efficient capture of CYFRA21-1, CEA, and CA15–3 was achieved using biotinylated, antibody-coated magnetic beads. AuNPs/ZnSe QDs/AgNPs-tagged second antibodies helped realize sensitive quantification of the target antigen using single particle ICP-MS. Under optimum conditions, CYFRA21-1, CEA, and CA15–3 linear concentration ranges were 0.05–50 ng mL −1 , 0.02–100 ng mL −1 , and 0.6–250 mU mL −1 . The correlation coefficients were 0.9999, 0.9987, and 0.9970, respectively. CYFRA21-1, CEA, and CA15–3 detection limits were 0.02 ng mL −1 , 0.006 ng mL −1 , and 0.25 mU mL −1 , respectively. Relative standard deviations (RSD) for CYFRA21-1, CEA, and CA15–3 were 3.2%, 4.4%, and 4.2%, respectively. The method simultaneously detected CYFRA21-1, CEA, and CA15–3 in human lung cancer serum samples with recoveries of between 89.8% and 101%.
研究领域:
医学诊断
·
癌症研究
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）