BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2021
·Vol. 107
·期 1
·147-153
·
IF 2.151
Zhang Rui,Dong Pengyue,Sun Hongwen,Liu Chunguang
To investigate the combined effects of excess boron (B) and high salinity on the growth of freshwater algal species, Chlorella vulgaris and Microcystis aeruginosa were cultured in the medium with different B and salinities. The results show that high levels of B and salinity inhibited the growth of the two algal species. For C. vulgaris , low levels of B can alleviate the growth inhibition induced by salinity, and low levels of salinity can also relieve the growth inhibition induced by B. In contrast, high levels of salinity have little effect on B toxicity, while high levels of B aggravate salinity stress. For M. aeruginosa , salinity aggravates B toxicity, regardless of salinity levels. B supply worsens salinity stress on M. aeruginosa , regardless of supply doses. These results suggest that it may be possible to control algal bloom by regulating B or salinities.
研究领域:
生态学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Xuan Guo,Can Chen,Jianlong Wang
Microplastics and sulfamethoxazole (SMX) are ubiquitous in aquatic environment. In this study, we investigated the sorption of SMX onto six types of microplastics (polyamide (PA), polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC) and polypropylene (PP)). The sorption rate and mass transfer steps of SMX was studied by using the phenomenological kinetics models. The effect of pH and salinity on SMX sorption was examined. The results showed that the sorption of SMX onto microplastics reached equilibrium within 16 h. The external mass transfer was the slowest sorption step. The linear and Freundlich isotherms fitted well the sorption equilibrium data. PA had the highest sorption capacity (2.36 mg g −1 at SMX concentrations of 12 mg L −1 ), with high distribution coefficient ( K d ) value (284 L kg −1 ). The K d values of PE, PS, PET, PVC, and PP ranged from 22.2 to 30.9 L kg −1 . The sorption capacity of SMX decreased with increase of pH and salinity in the solution.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GEOFLUIDS
·
2020
·
IF 1.534
Xiaolin Wang,Ye Qiu,I-Ming Chou,Rongqing Zhang,Guanglai Li,Richen Zhong
In situ Raman spectra of aqueous K2WO4-HCl, K2WO4-HCl-NaCl, and K2WO4-CO2-NaCl solutions were collected at elevated temperature (, 100–400°C) and constant pressure () of 30 MPa. The stretching vibration band of the W=O bond () was analyzed to reveal the species of tungsten (W) responsible for the hydrothermal transport of W during mineralization. Results showed that monomeric tungstates with (W=O) bands at ~930 and 950 cm-1 are the dominant W species in weakly alkaline (room temperature, ) to near-neutral (room temperature, ) solutions under the investigated conditions. Overall, the stability of polymeric tungstate species with (W=O) bands at ~965–995 cm-1 decreases with rising temperature and was not detected at ≥300°C in moderately acidic solution (room temperature, ). However, increased fluid acidity and salinity obviously enlarged the temperature stability field of polymeric tungstate species. In highly acidic solution (room temperature, ), polymeric tungstates are the only stable W species even at 400°C. In the presence of 1.9 mol/kg NaCl, polymeric tungstate(s) can persist to at least 350°C in moderately acidic solution. Considering that 300–350°C is the major W-mineralizing range and W-mineralizing fluid is generally characterized by a moderately acidic nature, we propose that, in addition to monomeric tungstates, polymeric tungstates can also be important W species in some natural geological fluids that are responsible for the mineralization of W. Future studies of the W mineralization mechanism should take this issue into account.
研究领域:
地球化学
·
矿物学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2018
·Vol. 25
·期 5
·481-488
·
IF 1.261
Li Zhi-li,Rao Feng,Song Shao-xian,Li Yan-mei,Liu Wen-biao
In saline water flotation, the salinity can cause a distinguishable slime coating of clay minerals on chalcopyrite particles through its effect on their electrical double layers in aqueous solutions. In this work, kaolinite was used as a representative clay mineral for studying slime coating during chalcopyrite flotation. The flotation of chalcopyrite in the presence and absence of kaolinite in tap water, seawater, and gypsum-saturated water and the stability of chalcopyrite and kaolinite particles in slurries are presented. Zeta-potential distributions and scanning electron microscopy images were used to characterize and explain the different slime coating degrees and the different flotation performances. Kaolinite particles induced slime coating on chalcopyrite surfaces and reduced chalcopyrite floatability to the greatest extent when the pH value was in the alkaline range. At 0.24wt% of kaolinite, the chalcopyrite floatability was depressed by more than 10% at alkaline pH levels in tap water. Salinity in seawater and gypsum-saturated water compressed the electrical double layers and resulted in extensive slime coating.
研究领域:
矿物加工工程
·
表面化学
·
采矿工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Wenjie Zou,Bo Rao,Ruijing Xu,Ting Xiao,Wei Zhao,Zhijun Zhang,Jun Huang
In this work, the adsorption performance of a novel chitosan-based flocculant (Chi-g-CPAM) and a cationic flocculant (CPAM) onto the kaolinite surface as well as the interaction mechanisms have been investigated by settling tests, atomic force microscopy (AFM) and quartz crystal microbalance with dissipation (QCM-D). When the KCl concentration of the solution altered from 1 mM to 100 mM, the settling rate of kaolinite suspension using CPAM deteriorated from 2.73 m/h to 1.97 m/h. However, the Chi-g-CPAM exhibited salt resistance as the settling rate changed slightly from 2.34 m/h to 2.44 m/h. From the QCM-D results, the Δ f of CPAM onto silica sensor changed from − 3.6 Hz to − 33.6 Hz and -Δ D /Δ f × 10 6 increased from 0.167 to 0.223, confirming that the CPAM layer adsorbed on the silica surface was thicker and more dissipative in 100 mM KCl solution. Meanwhile, the Δ f of Chi-g-CPAM onto silica sensor changed from − 14.3 Hz to − 33.9 Hz. The conformation of Chi-g-CPAM layer changed slightly as the -Δ D /Δ f × 10 6 increased from 0.174 to 0.186. From the AFM measurements in 1 mM and 100 mM KCl solution, the distance of adhesion forces between the silica probe and CPAM expanded from approximately 20 nm to around 50 nm, and the adhesion force changed from 1.9 nN± 0.1 nN to 21.3 nN± 0.1 nN. The interaction forces with a long range (∼100 nm) maintained at about 3 nN between the silica probe and Chi-g-CPAM. Such difference was mainly attributed to the steric hindrance effect originating from the shorter molecular chain of Chi-g-CPAM. In 100 mM KCl solution, the CPAM molecules with long chains had a more coiled conformation than Chi-g-CPAM, which resulted a train-like flat adsorption conformation and larger adhesion, and formed a loose and thick polymer layer of CPAM in high salinity. The insights into the flocculating performance in varying salinity solutions of CPAM and Chi-g-CPAM will contribute to the molecular design of chitosan-based flocculants for efficient wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Qiong Wen,Na Liu,Ruohua Qu,Fei Ge
The photoaging of microplastics (MPs) accumulated in the sea can be influenced by humic acid (HA). However, the role of salinity cannot be ignored, as it may potentially disrupt the interaction between MPs and HA, thereby altering the photoaging of MPs. Herein, this study investigated how salinity influences the effect of humic acid (HA, derived from lignite) on the photoaging of polystyrene microplastics (PS MPs) in artificial and natural seawater. The results revealed that HA promoted the photoaging of PS MPs under both low (5 PSU) and high salinity (35 PSU) in light conditions (L), reflected in the formation of fragments, the production of oxygen–containing functional groups (O H, C O, and O C O), and the increase in hydrophilicity of PS MPs. Furthermore, high salinity promoted the photoaging of PS MPs with HA more significantly, as evidenced by the similar indicators and the order of oxygen/carbon atom ratio (O/C): L–HA–High (0.15) > L–HA–Low (0.10) > Unaged (0.02). Interestingly, due to the reduction of electrostatic repulsion, the adsorption of HA on photoaged PS MPs in natural and artificial high salinity seawater was 1.77 mg/g and 0.39 mg/g, respectively, which was significantly higher than those PS MPs photoaged in the low salinity seawater. Furthermore, the electron spin resonance (ESR) results confirmed that more hydroxyl radicals ( OH) were generated after adsorbing HA under high salinity conditions, thus promoting the fragmentation and oxidation of PS MPs. Overall, our findings highlight the crucial role of salinity in influencing the photoaging of MPs with HA and help to assess the marine risk of MPs accurately.
研究领域:
环境科学
·
海洋学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Ming Zhang,Yudong Feng,Kaihua Zhang,Yafeng Wang,Xiangliang Pan
Polycyclic aromatic hydrocarbons (PAHs) tend to adsorb and accumulate on sediments owing to their hydrophobicity and persistence. Salinity is the predominant factor determining the PAH partition between aqueous and solid phases in freshwater, estuaries and seawater. This study focuses on the impact of salinity on the phenanthrene (PHE) removal from sediments using an in situ and targeted remediation technology – colloidal ozone aphrons (COAs). The ozone-encapsulated colloidal aphrons exhibited increasing air holdup but decreasing stability with the salinity increasing from 0.5‰ to 35‰. The hydrophobic attraction between Tween-20-coated bubbles and the hydrophobic solid surface weakened at high salinities. The presence of inorganic ions in the aqueous phase could lead to the salting-out of nonionic compounds (PHE, Tween-20 and even ozone), hindering detaching and degrading PHE from the solid phase. Anyhow, COAs achieved high efficiencies of washing (88.0–90.2%) and oxidative degradation (74.0–76.5%) particularly for the hydrophobic sediments with highly concentrated PHE (200.4 μg/kg) over the investigated salinities. The flushing effect imposed by the bubble flow played an important role, which was not greatly influenced by salinity. Although the dissolved natural organic matter competed with PHE for COAs and led to low PHE removal, the efficiency was improved by successive COA addition.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Algal Research-Biomass Biofuels and Bioproducts
·
2021
·
IF 4.401
Xinshu Li,Xin Sun,Lin Gao,Juntian Xu,Guang Gao
Pyropia is an important marine crop and periodical dehydration could help kill fouling organisms during cultivation. However, our understanding regarding the effects of periodical dehydration on biomass yield and biochemical composition of Pyropia remains very lacking, particularly for thalli grown at different salinities. In this study, Pyropia yezoensis experiencing periodical dehydration or not was cultured at four levels of salinities (17, 25, 32, 39 psu) for 19 days. The highest growth rate was found at salinity 25 psu and lowest was at salinity 39 psu. Dehydration reduced relative growth rate at each salinity except for the insignificant decrease at 39 psu. Dehydration did not affect the maximal photochemical efficiency (Fv/Fm) and the highest salinity decreased it slightly. Dehydration induced more Chl a and carotenoids and highest Chl a content was found at salinity 39 psu. Dehydration did not affect phycoerythrin or phycocyanin content at salinities 25–39 psu but respectively increased them by 28% and 50% at salinity 17 psu. Dehydration did not affect content of any amino acid while salinity interacted with dehydration on most amino acids. The optimal salinity for the production of total amino acids (AA)，essential AA, umami AA, and sweet AA was 25 psu for the thalli without dehydration; while it shifted to 17 psu for the thalli with dehydration. Dehydration and salinity interacted on content of the fatty acids C12, C18:1(n-9), C18:2(n-6), and C20:2(n-6). For the synthesis of eicosapentaenoic acid (EPA, C20:5(n-3)) and polyunsaturated fatty acids (PUFA) in thalli without dehydration, the optimal salinity was 39 psu, but the effect of salinity disappeared when thalli experienced periodical dehydration. These findings show the interactive effects of periodical dehydration and salinity on biomass yield and biochemical composition in P. yezoensis and provide insights into optimizing conditions for nori cultivation.
研究领域:
海洋生物学
·
藻类学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Shanshan Wang,Nana Xue,Wenfeng Li,Daoyong Zhang,Xiangliang Pan,Yongming Luo
The partition of antibiotics and antibiotic resistant genes (ARGs) between the microplastics (MPs) and the surrounding water with various salinity are still unclear. In this study, we hypothesized that adsorption of antibiotics on MPs might cause a significant change of the structure of microbial communities, diversity and abundance of ARGs on MPs and this might be further affected by change of salinity. In this study, we investigated adsorption of four common antibiotics (sulfamerazine, tetracycline, chloramphenicol and tylosin) to polyethylene (PE) MPs in river, estuary and marine waters, and the differences of antibiotic resistant genes (ARGs) and bacterial communities on MPs and in the three waters. The results showed that MPs can enrich antibiotics, ARGs and microbes from the surrounding water. Elevated salinity could reduce adsorption of antibiotics to MPs and the abundance of ARGs. For example, MPs can concentrate more antibiotics and ARGs in the fresh river water than in the estuary and the marine waters. In addition, ARGs and bacterial communities on MPs at various salinity were significantly different under the pressure of four antibiotics. On MPs, sul1, sulA/folP-01, tetA, tetC, tetX and ermE increased significantly but a few new ARGs such as sulA/folP-01 and tetA appeared. The structure of the bacterial communities on MPs was different from the surrounding water since some bacteria species found on MPs were barely detected in the surrounding water while some genera on MPs vanished after exposure to antibiotics. As the antibiotics adsorbed and the ARGs on MPs decreased with the water salinity, the structure of the communities on MPs thus varied with salinity change. These findings are important to understand the effects of MPs on the transport, fate and ecological risk of antibiotics and ARGs in different aquatic environments.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2018
·
IF 4.358
Baile Xu,Fei Liu,Philip C. Brookes,Jianming Xu
Microplastics have a great potential to sorb organic pollutants from the adjacent environment. In this study, the sorption of tetracycline , a polar and ionizable antibiotic, on three types of microplastics (polyethylene (PE), polypropylene (PP) and polystyrene (PS)) were investigated in batch sorption experiments. The sorption isotherms were well fitted by the Langmuir model, indicating that not only hydrophobic interactions but also other interactions (e.g. electrostatic interactions) played important roles in the sorption process. PS had the maximum sorption capacity, following the order PS > PP > PE, which can be attributed to polar interactions and π-π interactions. The sorption of tetracycline on microplastics was significantly influenced by pH, with sorption capacity increasing gradually, peaking at pH 6.0 and then decreasing, likely due to the influence of tetracycline speciation with the change of pH. Fulvic acid was selected as representative dissolved organic matter (DOM) to examine the effect on sorption. The increasing concentration of fulvic acid inhibited the sorption of tetracycline on three microplastics, decreasing them by more than 90% at the fulvic acid concentration of 20 mg/L, which implied a greater affinity of tetracycline to fulvic acid than to microplastics. Increasing salinity from 0.05 to 3.5% had negligible effects on the sorption of tetracycline on the three microplastics. Our results highlight the importance of pH and DOM on the sorption of tetracycline on microplastics, and suggest the relatively minor role of microplastics in the fate and transport of tetracycline in the aquatic environment in the presence of DOM.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2015
·Vol. 140
·期 10
·3368-3374
·
IF 4.107
Yan-Ran Li,Ye Sun,He-Fang Wang
Convenient reading out and/or determination of ionic strength (IS) is of great significance for both scientific research and real life applications. We presented here a novel method for the rapid and sensitive IS assay based on the electrolyte-induced sensitive wavelength blueshifts of the reflection spectra of polyacrylate capped Fe3O4 magnetic photonic crystals (PA–Fe3O4-MPCs). For HCl, MgSO4 and the common electrolytes corresponding to the salinity of seawater (including NaCl, KCl, MgCl2, CaCl2, Na2SO4 and their mixtures), the PA–Fe3O4-MPCs displayed wavelength blueshifts identical to the total IS of the aqueous solutions, regardless of the kind of above-mentioned electrolytes in the solutions. Besides, the PA–Fe3O4-MPCs exhibited relatively high sensitivity (an average of 294 nm L mmol−1 in the range of 0.05–0.30 mmol L−1, and an even higher value of 386 nm L mmol−1 at 0.05–0.15 mmol L−1) and fast response (within 8 s) to the IS of aqueous solutions. The relative standard deviation (RSD) for IS (NaCl, 0.1 mmol L−1) was 4.4% (n = 5). The developed method was applied to determine the salinity of seawater samples, and the determined results were validated by the traditional standard chlorinity titration and electric conductimetry method. The recoveries were in the range of 92–104%. The proposed PA–Fe3O4-MPCs based reflectometry method would have great potential for IS and salinity assays.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Chengtuo Niu,Lina Yang,Feiyun Zheng,Chunfeng Liu,Jinjing Wang,Xin Xu,Qi Li
This study aimed to provide a systematic analysis of the effect of environmental factors on the growth and volatile flavor compounds (VFCs) production ability of Zygosaccharomyces rouxii Y-8 and further elucidate its contribution to doubanjiang fermentation in different salinity. Lower salinity (0–9%), acidic pH (4.5–5.5), moderate temperature (25–35 °C) and air exposure favored the growth and VFCs accumulation of Z. rouxii Y-8, which also had higher concentrations of key jiang flavor contributing compounds benzene ethanol, 2-methoxy-phenol and pyrazines. Interestingly, samples with higher VFCs concentration were found to contain less kinds of VFCs. When inoculated into doubanjiang fermentation, Z. rouxii Y-8 showed critical roles on the formation of VFCs in doubanjiang . Among doubanjiang samples fermented in different salinity, doubanjiang with 9% salinity had the highest kinds of VFCs. Moreover, its flavor was more balanced and the jiang flavor was stronger. This indicated that the presence of adequate salinity was necessary for Z. rouxii Y-8 to produce critical VCFs responsible for doubanjiang flavor. The results would provide researchers and manufacturers with a deeper understanding of the characteristics of Z. rouxii Y-8 and rationales to utilize Z. rouxii Y-8 as starter to produce high quality BBFFs.
研究领域:
微生物学
·
食品科学
✓ 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）