Toxics
·
2023
·Vol. 11
·期 10
·803
·
IF 4.6
Chengzhi Li,Yuxi Feng,Peng Tian,Xiaozhang Yu
The accumulation of proline impacts the defense mechanisms of plants against the harmful effects of adverse environmental conditions; however, its concentration in plants is associated with the metabolism of N. Therefore, the effects of exogenous organic [glutamate (Glu)/arginine (Arg)] and inorganic [nitrate (NO3−)/ammonium (NH4+)] N on the accumulation of proline (Pro) in rice plants under trivalent chromium [Cr(III)] stress were studied through using the mass balance matrix model (MBMM). Application of ‘NH4+’ showed the largest contribution to the Pro content in rice shoots under different concentrations of Cr(III), followed by ‘NO3−’, ‘Arg’, and ‘Glu’ applications. On the other hand, ‘Arg’ application displayed the largest contribution to the Pro content in roots under Cr(III) stress, followed by ‘NH4+’, ‘Glu’, and ‘NO3−’ applications. The combined application of ‘NH4++Arg’ showed the greatest contribution to the Pro content in both roots and shoots of Cr(III)-treated rice seedlings, while the application of ‘NO3−+Glu’ showed the least contribution to the Pro content in rice seedlings. The current study indicated that the endogenous level of Pro in rice seedlings is quite sensitive to Cr(III) stress under different N sources, and the mathematical modeling showed a reliable result while estimating the relationship between Pro content and N source application.Keywords:proline;rice;trivalent chromium;nitrogen source;mass balance
研究领域:
植物生理学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Hui Zhang,Ge Zhang,Jingkun Xu,Yangping Wen,Shouli Ming,Jie Zhang,Wanchuan Ding
Trivalent chromium (Cr 3 + ) can cause severely environment pollution, declining quality of edible agro-products in plants and animals, and human diseases. Poly( N -(9-fluorenylmethoxycarbonyl)- l -histidine) (PFLH) synthesized by the direct electro-polymerization of its corresponding commercially available monomer in both boron trifluoride diethyl etherate and dichloromethane mixed system. The “turn-on” type fluorescent sensor based on PFLH displayed high sensitivity and selectivity for Cr 3 + detecting. The structure of PFLH was rationally proved by 1 H NMR spectra, FT-IR spectra, quantum chemical calculations , and its optical properties were characterized. The electro-synthesized PFLH exhibited a “turn-on” fluorescent response towards Cr 3 + , which was employed as a sensing platform for the “turn-on” fluorescent analysis of Cr 3 + in a wide linear range from 5.1 nM to 25 μM with a low limit of detection as low as 1.7 nM. The possible mechanism of fluorescent “turn-on” sensor based on PFLH for Cr 3 + was proposed. The sensor displayed high sensitivity, good selectivity, satisfactory practicability, suggesting that PFLH has potential fluorescent application for “turn-on” sensing Cr 3 + in agricultural environments and edible agro-products of plants and animals.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Teng Xu,Xiaofeng Jiang,Yuling Tang,Yunhang Zeng,Wenhua Zhang,Bi Shi
Trivalent chromium [Cr(III)] and tannins serve as necessary substances in leather processing and coexist in tannery site, which lead to the chromium contamination in site soil when disposed improperly. However, coexisting tannins are very likely to complex with Cr(III) and affect its properties, ultimately changing the mobility of chromium in soil. In this study, tannic acid (TA) was selected to investigate the complexation with Cr(III) and the influence on the solubility and sorption of Cr(III) in soils. Then, the transport behavior and mechanism of Cr(III)-TA complexes in soil was clarified. Dialysis results showed that the increase of TA concentration and solution pH promoted the formation of complexed Cr(III). The results of UV–Vis absorption spectroscopy , X-ray photoelectron spectroscopy, and density functional theory calculations indicated that the adjacent ionized phenolic hydroxyls in TA functioned as the binding sites with Cr(III) to form the Cr–O bonds and the degree of complexation increased with pH. The Cr(III)-TA complexes had higher solubility than free Cr(III) at pH ≥ 6.0. Batch sorption experiments demonstrated that the sorption capacity of Cr(III)-TA to soils with different pH was always lower than that of free Cr(III). These reasons led to the stronger mobility of Cr(III)-TA in soil columns than Cr(III). Our research reveals that the enhanced mobility of Cr(III) in soils coexisting with TA.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Teng Xu,Xiaofeng Jiang,Yuling Tang,Yunhang Zeng,Wenhua Zhang,Bi Shi
The kinetics and mechanisms of the oxidation of Cr(III) in soil contaminated by unsaturated oils were investigated. Batch experiments were performed with unsaturated oils, namely, fish oil, hydrogenated lard oil, rapeseed oil, and caster oil. Impacts of environmental parameters, including temperature, soil pH, UV irradiation, oil content, and soil moisture content were examined. Results showed that oxidation of Cr(III) in oil-treated soils was accompanied by the formation of Cr(VI), which first increased and then decreased. Changes in the peroxide values of oils and the production of hexanal in the soil indicated that hydroperoxide was closely related to the formation of Cr(VI). tert -Butylhydroperoxide, as a model molecule of hydroperoxide, significantly enhanced the oxidation of Cr(III) in water. This result further showed that hydroperoxides were responsible for the oxidation of Cr(III). Native soil substances, such as organic matter, Fe(II), and microbes, and the decomposition products of hydroperoxides, such as aldehydes, could reduce Cr(VI). The change in Cr(VI) content in the soil resulted from the competition between the oxidation of Cr(III) and the reduction of Cr(VI). High temperature, high soil pH, UV irradiation, and low soil moisture content could facilitate the oxidation of Cr(III), which is of environmental significance.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CURRENT MICROBIOLOGY
·
2013
·Vol. 68
·期 4
·448-456
·
IF 1.52
Huang Zhiwei,Kuang Xin,Chen Zhongxiang,Fang Zhijia,Wang Song,Shi Ping
Chromium is a significant mutagen and carcinogen in environment. We compared the effects of tri- and hexavalent chromium on cytotoxicity and oxidative stress in yeast . Cell growth was inhibited by Cr 3+ or Cr 6+ , and Cr 6+ significantly increased the lethal rate compared with Cr 3+ . Both Cr 3+ and Cr 6+ can enter into the yeast cells. The percent of propidium iodide permeable cells treated with Cr 3+ is almost five times as that treated with the same concentration of Cr 6+ . Levels of TBARS, O 2
− , and carbonyl protein were significantly increased in both Cr 6+ - and Cr 3+ -treated cells in a concentration- and time-dependent manner. Moreover, the accumulation of these stress markers in Cr 6+ -treated cells was over the Cr 3+ -treated ones. The decreased GSH level and increased activity of GPx were observed after 300 μM Cr 6+ -exposure compared with the untreated control, whereas there was no other change of GSH content in cells treated with Cr 3+ even at very high concentration. Exposure to both Cr 3+ and Cr 6+ resulted in the decrease of activities of SOD and catalase. Furthermore, the effect of Cr 6+ is stronger than that of Cr 3+ . Null mutation sensitivity assay demonstrated that the gsh1 mutant was sensitive to Cr 6+ other than Cr 3+ , the apn1 mutant is more sensitive to Cr 6+ than Cr 3+ , and the rad1 mutant is sensitive to both Cr 6+ and Cr 3+ . Therefore, Cr 3+ can be concluded to inhibit cell growth probably due to the damage of plasma membrane integrality in yeast. Although both tri- and hexavalent chromium can induce cytotoxicity and oxidative stress, the action mode of Cr 3+ is different from that of Cr 6+ , and serious membrane damage caused by Cr 3+ is not the direct consequence of the increase of lipid peroxidation.
研究领域:
环境科学
·
微生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Dashi Lei,Chunli Gou,Chunli Wang,Juanqin Xue,Zhongshen Zhang,Weizhen Liu,Zhang Lin,Jing Zhang
The reduced chromite ore processing residue (rCOPR) deposited in environments is susceptible to surrounding factors and causes reoccurrence of Cr(VI). However, the impact of natural sunlight on the stability of rCOPR is still unexplored. Herein, we investigated the dissolution and transformation behaviors of Cr(III)–Fe(III) hydroxide, a typical Cr(III)-containing component in rCOPR, under visible light. At acidic conditions, the release rate of Cr(III) under illumination markedly increased, up to 7 times higher than that in the dark, yet no Cr(VI) was produced. While at basic conditions, only Cr(VI) was obtained by photo-oxidation, with an oxidation rate of ∼7 times higher than that by δ-MnO2 under dark conditions at pH 10, but no reactive oxygen species was generated. X-ray absorption near-edge structure and density functional theory analyses reveal that coexisting Fe in the solid plays a critical role in the pH-dependent release and transformation of Cr(III), where photogenerated Fe(II) accelerates Cr(III) produced at acidic conditions. Meanwhile, at basic conditions, the production of intermediate Cr(III)–Fe(III) clusters by light leads to the oxidation of Cr(III) into Cr(VI) through the nonradical “metal-to-metal charge transfer” mechanism. Our study provides a new insight into Cr(VI) reoccurrence in rCOPR and helps in predicting its environmental risk in nature.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE ENGINEERING
·
2021
·
IF 3.169
Songnan Wang,Shiai Xu
Trivalent chromium (Cr(III)) was added into a titanium (Ti)-based solution in this study to prepare Ti/Cr(III) conversion coatings on the aluminium (Al) foil for lithium-ion battery package. Their surface morphology and chemical composition were characterized by field-emission scanning electron microscope (FE-SEM), energy-dispersive spectroscopy and X-ray photoelectron spectroscopy (XPS). The corrosion resistance and the adhesive strength between Al foil and hot melt adhesive (modified polypropylene film) were determined. The results reveal that the Ti/Cr(III) conversion coating is mainly composed of Al2O3, TiO2, Cr(OH)3 and Cr2O3, and possesses the best anticorrosive performance with a corrosion current density of 1.05 µA cm−2, which is one order of magnitude lower than pure Al foil. The adhesive strength between Ti/Cr(III)-treated Al foil and the adhesive is 14.3 N/15 mm with an increase of 250% compared with the pure Al foil, which meets the industry standard (12 N/15 mm).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Ying Wang,Yanhong Liu,Guangbin Li,Mingmin Zheng,Yusha Li,Anlei Zhang,Yingchun Zhang
In this study, Cr coatings were electrodeposited on carbon steel substrates by a trivalent Cr salt. The microstructure of the Cr coatings and their flow accelerated corrosion (FAC) resistance in simulated secondary circuit environments (10 MPa and 150 °C) of nuclear power plants were investigated. The results showed that the as-deposited coating was amorphous and crack-free. Annealing at 200 °C resulted in the decrease of Cr (OH) 3 and the increase of Cr and Cr 2 O 3 on the coating surface , which improved the corrosion resistance of the coating. The subsequent FAC test showed that the Cr coatings significantly improved the FAC resistance of the carbon steel substrate. The coating annealed at 200 °C exhibited better FAC resistance. The Cr-rich oxide film formed on the coatings was mainly Cr 2 O 3 , with a small amount of Cr and CrO 2 . Due to the galvanic effects caused by pinhole defects, abnormally grown annular deposits formed on the coating surface.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2012
·
IF 3.354
Lirong He,Sumei Cai,Bo Wu,Changdao Mu,Guangzhao Zhang,Wei Lin
Ultrasensitive differential scanning calorimetry (US-DSC) was used to directly measure the thermal transition temperature and energy change of acid soluble collagen in the presence of Cr 3 + and Al 3 + sulfates. The behavior of Cr 3 + was analogous to kosmotropes in the cation Hofmeister series and increased the stability of collagen in dilute solutions. Meanwhile, the denaturational enthalpy change (Δ H ) of collagen was substantially reduced with change to increasing Cr 3 + concentration. This is likely due to the uni-point binding of Cr 3 + with carboxyl groups of collagen side chains that could decrease the hydrogen-bonding in collagen and result in the increase of protein hydrophobicity . In the case of Al 3 + , the interactions between the ions and collagen showed very different properties: at low and medium ion concentrations, the stability of the collagen was decreased; however, a further increase of Al 3 + concentration led to a salting-out effect of collagen, indicating the Al 3 + is a typical chaotropic ion. This striking difference of the two ions in the stabilization of collagen can be explained in terms of the different interactions between the cations and the carboxyl groups of collagen side chains. Additionally, we studied metal ion induced conformational change by the combination of circular dichroism (CD) and atomic force microscopy (AFM). CD measurements revealed that neither metal ion interactions of collagen with Cr 3 + nor Al 3 + ions destroyed the triple-helical backbone structure of collagen in the solution. AFM results further confirmed that the dehydration of collagen by Cr 3 + is more significant than Al 3 + , thus inducing the aggregation of collagen fibrils.
研究领域:
生物化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Processes & Impacts
·
2025
·Vol. 27
·期 2
·453-462
·
IF 3.9
Situ Mu,Qi Yang,Chenxu Yan,Tong Xu,Jing Zhang,Junjun Ma,Chun Liu
Trivalent chromium (Cr3+) is a heavy metal widely present in tannery wastewater, and organic ligands represented by gallic acid (GA) have significant effects on the environmental behavior of Cr3+. This study explored the binding process of Cr3+ with GA through the integration of ultraviolet-visible (UV-vis), Fourier transform infrared (FTIR), and fluorescence spectroscopy coupled with two-dimensional correlation analyses (2DCOS). UV-vis results showed that the average molecular weight of the solutions gradually increased with the addition of Cr3+ ions. The vibration of FTIR characteristic peaks indicated that the hydroxyl and carboxyl functional groups of GA were complexed with Cr3+ ions. On the basis of the fluorescence quenching of GA after the addition of Cr3+ ions, the complexation coefficient was calculated as 4 × 104. 2DCOS and nuclear magnetic resonance (NMR) spectra demonstrated the binding sequence of GA with Cr3+ as meta-hydroxyl groups → carboxyl groups → para-hydroxyl groups, and heterospectral 2DCOS showed that the intensity change in UV-vis absorption bands occurred before that in IR absorption bands. Density functional theory (DFT) was used to quantify the binding energy of GA with Cr3+ at different binding sites, and it was shown that the binding energy of the meta-hydroxyl group was the lowest. Overall, this study provides a new approach to the analysis of the molecular structure of complexes and the binding process between organic ligands and metal ions in wastewater.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Plasmonics
·
2017
·Vol. 13
·期 4
·1459-1465
·
IF 2.139
Yu Haili,Wang Zeru,Huang Wei
Here, we report a highly stable and sensitive colorimetric assay for Cr 3+ based on amido black 10B-stabilized silver nanoparticles (AgNPs) as the probes. The detection mechanism is that the coordination interaction between Cr 3+ and amido black 10B on the surface of AgNPs causes the cross-linking/aggregation of amido black-stabilized AgNPs, generating a redshift of the absorption peak and a color change from yellow to pink. Under the optimized assay conditions, this colorimetric assay displays a good linear relationship ( R
2 = 0.996) between relative absorbance ratios and the concentration of Cr 3+ in the range of 0.05–20 μM, and the limit of detection (LOD) was estimated to be 0.01 μM by the UV-Vis spectra and 15 μM by the naked eye. Additionally, the colorimetric assay shows a good selectivity over other metal ions, and it is successfully applied to detection of Cr 3+ in tap water, lake water, and river water samples with satisfactory recoveries.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Ningyi Chen,Bingcai Pan
Most metal probes based on gold nanoparticles (AuNPs) are designed for free metal ions in synthetic waters, and very few are applicable in the detection of metal–organic complexes ubiquitous in real water samples. In this study, we proposed a novel colorimetric nanoprobe strategy for complexed Cr(III) species based on the analyte-induced aggregation of AuNPs, as coated by a cationic surfactant tributylhexadecylphosphonium bromide (THPB) instead of traditional carboxyl modifiers. Such a detection system could be realized via both naked eye and/or UV–vis spectroscopy with detection limits of 8.0 and 0.29 μM, respectively, much lower than its allowable maximum level in industrial effluent as regulated by China EPA (1.5 mg Cr/L, ∼30 μM). The proposed detection system also exhibits high selectivity against various interfering substances including free ions, small organic molecules, and other metal–citrate complexes. The unique hydrolysis and extremely slow decomplexation of Cr(III) are believed to favor the formation of the specific interaction between Cr(III)–citrate and THPB-AuNPs, as verified by X-ray photoelectron spectroscopy characterization, thus endowing the nanoprobe with specific discrimination of the complexed Cr(III) via the aggregation of THPB-AuNPs. Also, the THPB-AuNPs could be stored at room temperature for 30 days and maintain constant detection performance. Moreover, the quantitative detection of Cr(III)–organic complexes with the background of various real water samples agreed well with that based on inductively coupled plasma atomic emission spectrometry, making it an attractive alternative for on-site detection of authentic samples containing Cr(III)–organic species.
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
危险品化学品经营许可证（带存储）