ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Rui Yang,Ronggang Zheng,Jiangyun Song,Hao Liu,Sujuan Yu,Jingfu Liu
The application of selenium nanoparticle (SeNP)-based fertilizers can cause SeNPs to enter the soil environment. Considering the possible transformation of SeNPs and the species-dependent toxicity of selenium (Se), accurate analysis of SeNPs and other Se species present in the soil would help rationally assess the potential hazards of SeNPs to soil organisms. Herein, a novel method for speciation of SeNPs and other Se species in soil was established. Under the optimized conditions, SeNPs, selenite, selenate, and seleno amino acid could be simultaneously extracted from the soil with mixtures of tetrasodium pyrophosphate (5 mM) and potassium dihydrogen phosphate (1.2 μM), while inert Se species (mainly metal selenide) remained in the soil. Then, extracted SeNPs can be effectively captured by a nylon membrane (0.45 μm) and quantified by inductively coupled plasma mass spectrometry (ICP-MS). Other extracted Se species can be separated and quantified by high-performance liquid chromatography coupled with ICP-MS. Based on the difference between the total Se contents and extracted Se contents, the amount of metal selenide can be calculated. The limits of detection of the method were 0.02 μg/g for SeNPs, 0.05 μg/g for selenite, selenate, and selenocystine, and 0.25 μg/g for selenomethionine, respectively. Spiking experiments also showed that our method was applicable to real soil sample analysis. The present method contributes to understanding the speciation of Se in the soil environment and further estimating the occurrence and application risks of SeNPs.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Aimei Hong,Qing Tang,Ashfeen Ubaid Khan,Maozhong Miao,Zhenlan Xu,Fei Dang,Qian Liu,Yawei Wang,Daohui Lin,Juliane Filser,Lingxiangyu Li
Nanoscale silver (n-Ag) including silver nanoparticles (Ag-NPs), silver chloride nanoparticles (AgCl-NPs), and silver sulfide nanoparticles (Ag2S-NPs) and their corresponding ionic counterpart, namely, dissolved Ag, may coexist in soils. X-ray absorption near edge spectroscopy (XANES) is used to elucidate the speciation of n-Ag in soils, whereas it possesses drawbacks like high costs, rare availability of the instrument, and providing semiquantitative data. We developed a new method for the identification and speciation of n-Ag in soils and sediments based on a sequential extraction technique coupled with inductively coupled plasma optical emission spectrometry. Extraction conditions were first evaluated, establishing the optimal extraction procedure; Ag-NPs, AgCl-NPs, and dissolved Ag in soil were simultaneously extracted by using an aqueous solution of 10 mM tetrasodium pyrophosphate, followed by selective isolation and quantification via AgCl-NPs dissolution (4.45 M aqueous ammonia), centrifugation (Ag-NPs), and detection. The Ag2S-NPs remaining in the soil were then extracted with Na2S solution at pH 7.0 through selective complexation. Optimal recoveries of Ag-NPs, AgCl-NPs, Ag2S-NPs, and dissolved Ag were 99.1 ± 2.4%, 112.0 ± 3.4%, 96.4 ± 4.0%, and 112.2 ± 4.1%, respectively. The method was validated to investigate the speciation of n-Ag in soils and sediments, exhibiting the distribution of Ag-NPs, AgCl-NPs, Ag2S-NPs, and dissolved Ag in each sample, wherein Ag2S-NPs, the major species of n-Ag, accounted for 35.42–68.87% of the total Ag. The results of n-Ag speciation in soil are comparable to those obtained through the linear combination fitting of XANES. This method thus is a powerful, yet convenient, substitute for XANES to understand the speciation of n-Ag in complex solid matrices.
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
·
2016
·
IF 3.976
Li Ma,Lin Wang,Yuyu Jia,Zhaoguang Yang
Arsenic contaminations have been evaluated in rice grains from Hunan Province, China. Forty-three locally grown rice samples were collected from 40 counties. Arsenic species including As(III), As(V), MMA and DMA were separated and determined by HPLC-ICP-MS method. The mean concentration of total arsenic in rice samples was 129.4 ± 49.2 μg/kg, lower than the Chinese maximum contaminant levels of inorganic arsenic in rice (200 μg/kg). The dominant species detected in rice samples was As(III), following DMA, As(V) and MMA. The Pearson's correlation analysis indicated significant positive relationships between As(III) and total arsenic ( r = 0.939, p < 0.01), and DMA and total arsenic ( r = 0.761, p < 0.01). However, the percentage of As(III) decreased with the total arsenic concentration in rice ( r = − 0.515, p < 0.01). Spatial distribution map of total arsenic concentration in rice samples from Hunan Province was obtained using kriging interpolation. High levels of total arsenic in rice grains were observed in south and east regions associated with mining activities and urbanization process. The cancer risk and hazard quotient were employed to estimate the potential human health risk. The results suggested great carcinogenic risk and high potential non-carcinogenic risk to people consuming local rice in Hunan Province.
研究领域:
环境科学
·
公共卫生
·
农业化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Xiaolan Hu,Changhong Chen,Dawei Zhang,Yingwen Xue
A facile method was used to prepare two-dimensional MXene for the treatment of heavy metal ions in wastewater. The adsorbent has good selectivity for the adsorption of Hg (Ⅱ) in mixed divalent cationic metal solutions due to a large number of oxygen-containing functional groups on the surface of the material. The adsorption of mercury was tested using mercuric chloride and mercury nitrate solutions. The Langmuir maximum adsorption capacity of the adsorbent at a pH of 5.0 and a temperature of 30 °C is 1057.3 mg/g (mercuric nitrate) and 773.29 mg/g (mercuric chloride), respectively. The adsorbent also maintains a high adsorption capacity at low pH (pH = 2.0). The removal rate of mercury-containing wastewater within 100 mg/L is nearly 100%. The chemical species of Hg-containing ions at different pH and temperatures was studied. It was found that the adsorbent could maintain a high adsorption capacity for different forms of Hg-containing ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2023
·
IF 4
Zhentao Zhou,Heng Xiong,Baoqiang Xu,Bin Yang,Wenlong Jiang
The controllable preparation of materials with unique structures and morphologies has become an important field in the development of nanomaterials . In this study, Sb 2 S 3 was used as the evaporation source to controllably prepare Sb 2 S 3 crystals with various morphologies under a vacuum. At 873 K and 30 min, antimony sulfide in the form of cauliflower-like was effectively made. At the same temperature and for 60 min, tubular antimony sulfide was formed. The initial forming conditions of fascicle-like antimony sulfide were at 873 K and 100 min and did not change with the increase in temperature. During the evaporation process, some antimony sulfide will condense into lumps, showing irregular feather-like and round particles. The products prepared by this method were analyzed and tested. The results showed that the grade of antimony sulfide prepared by this method was further improved, and the content of Sb and S increases by 1.64% and 1.21% on average. This method offers a simple production process, a more regular product shape, and does not require the use of any additives.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Yamei Guo,Yin Liang,Yuan Wang,Rixin Tan,Teyu Wu,Hanjie Li,Shushu Li,Xiao Yang,Shuqian Wang,Jinli Qin,Yong Liang
Vanadate has become an important indicator for environmental testing due to its high toxicity, mobility, and difficulty in degradation. In addition, depending on its dynamic aggregation, analyzing vanadate is not a single content test; it needs further morphological analysis. Previous research has tended to construct a single functional platform with complicated procedures and expensive equipment, making it difficult to obtain a comprehensive picture of vanadate in a short time. Herein, we constructed a dual-response fluorescent probe EuTAT@Rh B formed by Eu3+, 2-aminoterephthalic acid (TAT), and rhodamine B, which could generate structural changes based on the morphology distribution characteristics of vanadate with pH. In the concentration range from 5 × 10–7 to 2 × 10–4 mol/L, the detection limits (3σ/slope, σ = s/I0) of orthovanadate VO43– and metavanadate VO3– were 1.67 × 10–8 and 2.0 × 10–9 mol/L, respectively. In addition, under 254 nm UV light, the spirolactam ring-controlled structures varied with pH and vanadate concentration, producing different types of photochromic structures, which were able to correspond essentially to the pH range of vanadate morphology distribution. Thus, a window with both vanadate and pH signals was constructed under the dual channels of UV and fluorescence, and we successfully achieved the visual integrated analysis of vanadate. This dual-channel visualization method has the advantages of simplifying the analysis process and improving the detection efficiency, which is of great significance in practical applications and provides a way to identify other polymeric substances.
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
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiaoyu Dong,Lanlan Li,Jihong Chen,Jiayuan Tang,Shu Zhang,Qian Yao,Zhirong Zou
A portable and easy-use analytical system was established for speciation analysis of inorganic antimony (Sb(III) and Sb(V)) based on hydride generation-smartphone colorimetric method. Metal organic framework (Ag-MOF) was served as substrate here. Sb(III) was transformed to stibine (SbH 3 ) during hydride generation process, SbH 3 was then transported and reacted with Ag-MOF in reaction bottle, leading to its color turn to black from light gray, the variance was then distinguished by visual and smartphone mode. A detectable limit as low as 0.01 μg/mL can be readout by smartphone mode. Besides, citric acid was used as masking reagent for speciation analysis of Sb(III) and Sb(V). Several real environmental water samples were further detected using this colorimetric system and recoveries for those samples were 90–106 %. The potential application of this method for rapid and field analysis of inorganic antimony was further demonstrated by analysis of a certified reference water sample (BWZ6657-2016B).
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2016
·Vol. 31
·期 11
·2285-2292
·
IF 3.379
Xiaoxia Zhou,Jingfu Liu,Chungang Yuan,Yongsheng Chen
The growing production and widespread application of silver nanoparticles (AgNPs) have led to their release into the environment, where they are mostly transformed to silver sulfide nanoparticles (Ag2S NPs). Thus, speciation analysis of Ag2S NPs in environmental matrices is essential for understanding the environmental process and toxic effects of AgNPs. Herein, we report the use of aged iron oxide magnetic particles (IOMPs) as magnetic solid-phase extraction adsorbents for speciation analysis of Ag2S NPs. It was found that IOMPs are excellent adsorbents for the selective extraction of silver-containing nanoparticles (AgCNPs) including Ag2S NPs, AgNPs and AgCl NPs in the presence of Ag+. More importantly, Ag2S NPs can be distinguished from the other AgCNPs by sequential elution. After pre-eluting AgNPs and AgCl NPs as Ag+ with 2% (v/v) acetic acid and IOMPs as the sacrificial oxidants, Ag2S NPs were completely eluted as a Ag(I) complex by 10 mM thiourea in 2% (v/v) acetic acid and quantified directly by inductively coupled plasma mass spectrometry (ICP-MS). While the extraction of Ag+ was negligible, the maximum extraction of AgCNPs by IOMPs was attained at pH 4.9–6.2, and the interference of humic acid in the AgCNP extraction can be efficiently eliminated by adding Ca2+. Under optimized conditions, the method provides low detection limit (0.068 μg L−1) and high reproducibility (relative standard deviations < 5.1%) for Ag2S NPs. By simultaneously spiking 0.16–10.3 μg L−1 AgNPs and 0.53–14.8 μg L−1 Ag2S NPs, the Ag2S NP recoveries were in the range of 69.6–100.2% for the tap, river and lake waters; and in the range of 106.2–149.9% for the WWTP effluent due to the part sulfidation of AgNPs to Ag2S NPs. Our method is valid for the speciation analysis of Ag2S NPs in water samples, which provides an efficient approach for studying the sulfidation of AgNPs and Ag+.
研究领域:
环境科学
·
分析化学
✓ 已验证
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
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Liwen Zhang,Zhongbo Shang,Kaixuan Guo,Zhixian Chang,Hongling Liu,Deliang Li
Different speciation of heavy metal ions has different toxicity level. The different speciation contents can be used as an important basis to evaluate the passivation efficiency of passivator. In this study, Ni 2+ , Cu 2+ and Zn 2+ in soil was passivated with thiol-functionalized nano-silica by solidification/stabilization technology, and the behavior of heavy metal ions in soil were explored. The result shows that, passivation time, soil moisture and passivator dosage can influence the toxicity of heavy metal ions via changing the speciation of metal ions. Passivation time and passivator dosage will promote passivation efficiency, while too low or too high soil moisture are not conducive to the passivation. The change of soil moisture will affect the surface charge distribution of soil and passivator, thus influence the migration of metal ions. According to speciation analysis, four kinds of speciation could be transferred reciprocally and the transformation will cause impact on the toxicity of heavy metal ions in soil. We explained the behavior of different metal ions based on the percentage of various speciation of heavy metal ions and inferred the transformation process of such metal ions in the passivation process. At the same time, based on Webber-Morris equation, the kinetic process during passivation process was discussed.
研究领域:
环境科学
·
土壤修复
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2017
·
IF 2.752
Ji Xia,Yong Fang,Yue Chen,Yushi Pan,Peng Li,Mei Xue,Qiuhui Hu
In this study, an analytical methodology for lead (Pb) speciation analysis in rice samples using reversed-phase chromatography–inductively coupled plasma mass spectrometry (RP-HPLC-ICP-MS) was developed. In particular, optimization of chromatographic conditions was carried out to separate four Pb species, namely, Pb II , trimethyllead chloride (TML), triethyllead chloride (TEL), and tetraethyllead (TTEL). The method was conducted with a C 18 column in gradient elution using methanol and acetic acid/ammonium acetate. Moreover, a combination of 1% EDTA in 2% methanol with the assistance of ultrasound was chosen as the rice sample extraction solution. The results showed that the four Pb species could be separated within 25 min using the optimal method, of which the limits of detection were in the range of 0.032–0.631 μg L −1 with correlation coefficients (R 2 ) of 0.998–0.999. The method was then successfully applied to study Pb species in rice, and Pb II was the main species in rice samples.
研究领域:
食品科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
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
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）