Journal of Environmental Sciences
·
2024
·
IF 5.9
Ya-Ting Liu,Bo-Fang Yan,Xuan Cai,Hong-Xiang Zheng,Rong-Liang Qiu,Ye-Tao Tang
The accumulation of Cd by rice poses significant health risks. Foliar fertilization with Zn can reduce grain Cd contents in rice grown in Cd-contaminated soils. However, atmospheric deposition on leaves is another vector of Cd contamination, and it remains unclear how Zn application affects the allocation of such Cd. We conducted an experiment where the flag leaves of rice plants were treated with solutions with various Zn concentrations and a constant Cd concentration. The 111 Cd stable isotope was used to trace the flux of foliar-applied Cd. Higher levels of foliar-applied Zn enhanced Cd efflux and grain allocation. This is attributed to limited sequestration of foliar-applied Cd in the leaf cell symplasm and increased Cd desorption from leaf cell walls when a high Zn 2+ concentration occurs in the apoplast . Nonionic Zn oxide nanoparticles mitigated these effects. Additionally, the expressions of OsLCT1 and OsZIP7 in flag leaves and OsHMA2 and OsZIP7 in the uppermost nodes were upregulated under high-Zn 2+ treatment, which may facilitate Cd phloem loading and grain allocation. Caution is advised in using foliar Zn in areas with high atmospheric Cd due to potential grain-contamination risks.
研究领域:
植物学
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环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 8
·4162-4171
·
IF 3.049
Zhendong Zhao,Qianqian Wu,Tiantian Nie,Wenjun Zhou
Atrazine (ATZ) adsorption in two natural soils amended with biochars produced from different feedstocks at 300, 500, and 700 °C were investigated; further, the relationships between the surface and partition adsorption capacities of ATZ in biochar-amended soils with biochar characteristics were quantitatively evaluated. The results revealed that high aromaticity, hydrophobicity, and low polarity of biochar facilitated ATZ adsorption. The addition of selected biochars significantly increased the adsorption of ATZ on paddy soil (PS) and black soil (BS) by 5.2–7.5 times and 2.3–4.2 times, respectively. On the contrary, the degree of increase in surface adsorption was much higher than that in partition adsorption, mainly due to the role of the specific adsorption of ATZ on biochar. Meanwhile, the respective contributions of surface and partition adsorptions to the total ATZ adsorption on biochar-amended soil changed with different addition amounts of biochar. The multiple nonlinear regression analysis demonstrated the linear dependence of H/C ratio, (O + N)/C ratio, and specific surface area (SSA) of biochar on the surface adsorption capacity of biochar-amended PS and BS, as well as the linear dependence of organic carbon and ash contents on the partition adsorption capacity of biochar-amended PS and the linear dependence of the H/C ratio and SSA on the partition adsorption capacity of biochar-amended BS. In biochar-amended soil systems, interactions between biochar and soil could affect ATZ adsorption, and organic matter in biochar might compensate for the role of soil organic matter in the competition for adsorption sites with a decrease in the biochar pyrolysis temperature.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Plant Ecology
·
2014
·Vol. 8
·期 4
·436-448
·
IF 2.284
Zhang Shujuan,Wang Li,Ma Fang,Bloomfield Keith J.,Yang Jixian,Atkin Owen K.
AimsOur study quantified the combined effects of fertilization and inoculation with arbuscular mycorrhizal fungi (AMF) on grain yield and allocation of biomass and nutrients in field-grown rice (Oryza sativa L.).MethodsA two-factor experiment was conducted at a field site in northeast of China (in Shuangcheng, Heilongjiang Province, Songhua River basin): six nitrogen–phosphorus–potassium fertilizer levels were provided (0, 20, 40, 60, 80 and 100% of the local norm of fertilizer supply), with or without inoculation with Glomus mosseae. At maturity, we quantified the percentage of root length colonization by AMF, grain yield, shoot:root ratios, shoot N and P contents and nutrients allocated to panicles, leaves and stems.Important FindingsAs expected, inoculation resulted in greatly increased AMF colonization, which in turn led to higher shoot:root ratios and greater shoot N contents. Shoot:root ratios of inoculated rice increased with increasing fertilization while there was a significant interaction between fertilization and inoculation on shoot:root ratio. Additionally, AMF inoculation increased panicle:shoot ratios, panicle N:shoot N ratios and panicle P:shoot P ratios, especially in plants grown at low fertilizer levels. Importantly, inoculated rice exhibited higher grain yield, with the maximum improvement (near 62%) at the lower fertilizer end. Our results showed that (i) AMF-inoculated plants conform to the functional equilibrium theory, albeit to a reduced extent compared to non-inoculated plants and (ii) AMF inoculation resulted in greater allocation of shoot biomass to panicles and increased grain yield by stimulating N and P redistribution to panicles.
研究领域:
植物学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 2
·2273-2286
·
IF 2.914
Chen Leilei,Li Haipu,Liu Yang,Cui Yue,Li Yue,Yang Zhaoguang
In view of the increasing attention on antibiotic contamination and their scarce data in the inland river (especially for the sediment), the occurrence of 28 antibiotics in sediments from the Xiangjiang River was comprehensively analyzed, and 22 antibiotics were detected with a total concentration ranging from 4.07 to 2090 ng g −1 . The residue was almost at a moderate or higher level in the aquatic environment around the world. Fluoroquinolones and tetracyclines were the dominant detected antibiotics, and the maximum total concentration could reach to 2085 ng g −1 , though that in surface water was just 33.4 ng L −1 . Oxytetracycline and chlortetracycline could be detected with high concentration in areas with lower population density. Usage profile of each antibiotic may be responsible for the spatial variation. Principal component analysis-multiple linear regression model indicated that direct discharge of domestic wastewater and livestock or aquaculture sewage could contribute 94.2% of the pollution. Redundancy analysis was used to screen out the environment variables, which were closely related to the pseudo-partitioning coefficients (K d ) of antibiotics in sediment and surface water for the first time, and showed that the K d was correlated with sediment pH negatively and organic carbon, total phosphorus, and conductivity of the sediments positively. High sedimentary organic carbon was considered to promote the higher K d in this river. This study would deepen the understanding of the occurrence of antibiotics in sediments from the inland rivers and provide scientific support for controlling the antibiotic contamination.
研究领域:
环境科学
·
生态学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2021
·Vol. 74
·期 2
·622-633
·
IF 2.474
Liu Zhihong,Ye Fengchun,Chen Rui,Wang Hongjun,Xia Longgong
Halogen-containing organic components in waste electrical and electronic equipment have an obvious influence on the distribution behaviors of valuable metals during the smelting processes. However, the mechanism is still incomplete in the literature. The equilibration-quenching-(ICP+EPMA) experimental technique has been applied in studying the partitioning behaviors of Au, Ag, and Sn in the Cu-FeO x -SiO 2 -CaO-Al 2 O 3 smelting system in the presence of halogen elements (F, Cl, Br). The obtained results showed that: (1) 93% Au terminated into the alloy phase in CaF 2 adding experiments, and a maximum of 32% Au reported to the gas phase in CaCl 2 or CaBr 2 adding experiments; (2) 22–49% Ag entered the gas phase when adding CaF 2 into the system, and 3–34% Ag entered into the gas phase when adding CaCl 2 or CaBr 2 ; and (3) halogen elements influenced Sn dramatically, and portions of Sn in the gas phase and slag phase increased along with increasing temperature or halides dosage.
研究领域:
冶金学
·
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
Xiaozhong Gao,Lei Qin,Shuangying Li,Liushan Jiang,Qingxiang Zhou,Yiping Xu,Mei Ma,Chunmao Chen
Pesticides are useful products for agriculture and human life, but they are often released into surface waters and are hazardous to aquatic ecosystems . Pesticides monitoring in surface waters is challenging due to the great variety, ultratrace levels and nonpoint source pollution of pesticides; however, continuous passive sampling may be conducive to solving these problems. This work evaluated the performance of a newly developed passive sampler (hydrophilic–lipophilic balance sorbent-embedded cellulose acetate membrane, HECAM) for six types of currently used/present pesticides. The uptake kinetics and equilibrium partitioning of nineteen pesticides in different dissolved concentrations were studied by dynamic accumulation and equilibrium partitioning experiments, respectively. In the dynamic accumulation experiments, pesticides gradually accumulated in the HECAM and followed a first-order kinetic model. The same type of pesticides had roughly comparable accumulation concentrations. The estimated uptake rate constants ranged from 1.04 to 13.5 L g −1 d −1 , and sampling rates ranged from 0.02 to 0.31 L d −1 for the pesticides in the HECAM (size of 2 cm × 3 cm). Pesticide accumulation concentrations in the HECAM increased linearly with increasing dissolved concentrations, which means that varying concentrations can also be monitored by the HECAM. In the equilibrium partitioning experiments, the pesticide partitioning behavior at varying dissolved concentrations can be described by the Freundlich model. The calculated equilibrium partition coefficients (log K D ) for pesticides ranged from 3.32 to 4.54, and different pesticide types showed different changes with log K ow . Comparable results were found when estimating chemical equilibrium partition coefficients by the dynamic accumulation and equilibrium partitioning methods. Field deployment of the HECAM in river waters resulted in the detection of four pesticides, and the measured results were comparable to those of active sampling coupled with liquid–liquid extraction. These results suggest that the HECAM would be a promising strategy for simultaneously monitoring diverse pesticides in waters.
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
SEPARATION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.2
Yajuan Li,Yanyang Wu,Kui Chen,Bin Wu,Lijun Ji,Jiawen Zhu
A polymer–salt aqueous two-phase system based on polyethylene glycol and sulfates was applied to explore the partition behavior of spiramycin. Binodal curves were measured by the turbidimetric titration method. The influence of temperature, salt concentration, and pH on the distribution behavior was investigated in detail by determining the partition coefficient and extraction efficiency. As pH and salt concentration increase, the partition coefficients increase accordingly. It was found that pH displays a significant influence on the partition behavior. The partition coefficient and extraction efficiency can reach 42.46 and 97.8%, respectively, at pH 9.0 and 15.80% (w/w) salt concentration.
研究领域:
生物化学
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Jianguang Qi,Yufeng Hu,Yue Gao,Weiting Ma,Shuqin Mo,Zhenyu Yang,Xianming Zhang,Liuyi Yin
Extraction was a key step in industrial process of trioxane . NaOH was utilized in industrial production of trioxane to maintain appropriate pH to prevent trioxane decomposition. Here efforts were made to investigate the salt effects that can produce an alkaline medium to prevent trioxane decomposition and, simultaneously, can induce salting-out effect to considerably increase the efficiency of extraction of trioxane from aqueous formaldehyde solutions. The salt considered included K 3 PO 4 , Na 3 PO 4 , sodium tartrate (Na 2 C 4 H 4 O 6 ) and sodium citrate (Na 3 C 6 H 5 O 7 ). The decomposition measurements were made for the (trioxane + formaldehyde + salt + H 2 O) solutions at 323.15 K for 96 h. No trioxane decomposition was detectable over the whole experimental time. Extraction measurements were made using each of the selected salts or NaOH as accelerant salt and benzene, dichlorobenzene or dimethylbenzene as extraction solvent . The results showed that both the extraction efficiency and the distribution coefficient were considerably increased and that such effects followed the order Na 3 PO 4 > K 3 PO 4 > Na 3 C 6 H 5 O 7 > Na 2 C 4 H 4 O 6 > NaOH. The results also showed that the effects of these salts on the water content in the organic phase and on the organic phase residual in the water phase were generally similar to or even more favorable than those of NaOH. The liquid−liquid phase equilibrium data were measured for the (trioxane + formaldehyde + K 3 PO 4 + H 2 O + benzene) solutions at (313.15, 323.15 and 333.15) K and were found to be well described by the Othmer−Toblas and the Hand equations.
研究领域:
化学工程
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Ruifen Jiang,Wei Lin,Sijia Wen,Fang Zhu,Tiangang Luan,Gangfeng Ouyang
A fully automated solid phase microextraction (SPME) depletion method was developed to study the partition coefficient of organic compound between complex matrix and water sample. The SPME depletion process was conducted by pre-loading the fiber with a specific amount of organic compounds from a proposed standard gas generation vial, and then desorbing the fiber into the targeted samples. Based on the proposed method, the partition coefficients ( K matrix ) of 4 polyaromatic hydrocarbons (PAHs) between humic acid (HA)/hydroxypropyl-β-cyclodextrin (β-HPCD) and aqueous sample were determined. The results showed that the log K matrix of 4 PAHs with HA and β-HPCD ranged from 3.19 to 4.08, and 2.45 to 3.15, respectively. In addition, the log K matrix values decreased about 0.12–0.27 log units for different PAHs for every 10 °C increase in temperature. The effect of temperature on the partition coefficient followed van’t Hoff plot, and the partition coefficient at any temperature can be predicted based on the plot. Furthermore, the proposed method was applied for the real biological fluid analysis. The partition coefficients of 6 PAHs between the complex matrices in the fetal bovine serum and water were determined, and compared to ones obtained from SPME extraction method. The result demonstrated that the proposed method can be applied to determine the sorption coefficients of hydrophobic compounds between complex matrix and water in a variety of samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Foods
·
2025
·Vol. 14
·期 9
·1637
·
IF 5.1
Weiheng Kong,Xianjiang Lin,Jing Ye,Yanbin Lu
In this study, an efficient and eco-friendly method was developed for continuous liquid–liquid extraction of lutein from microalgaeChlorella vulgaris. By employing a limonene-based biphasic liquid system, high-purity lutein was successfully obtained from the crude extract in a single run via centrifugal partition chromatography (CPC). Evaluation and optimization results demonstrated that limonene could effectively serve as a replacement forn-hexane as the solvent system for lutein extraction, exhibiting natural renewability and minimal environmental impact. Furthermore, the elution–extrusion operation mode was employed to fully exploit the liquid nature of the stationary phase in the extraction process, allowing for continuous sampling and separation without interruption. This proposed protocol offers a sustainable and environmentally friendly alternative for extracting valuable ingredients from microalgae biomass, demonstrating its potential as a scalable solution for producing lutein-enriched ingredients applicable to functional foods and nutraceuticals.
研究领域:
生物技术
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2020
·Vol. 44
·期 10
·e14824
·
IF 1.405
Wenwei Chen,Zhenbao Jia,Guangrong Huang,Yao Hong
Marine algae are important sources of biological substances. Polysaccharides and oil in algae have a broad range of biological activities. The aim of our study was to develop a novel method for the extraction of polysaccharides and oil from Schizochytrium limacinum by enzyme-assisted three-phase partitioning. S. limacinum was pretreated by protamex hydrolysis for 2 hr, at pH 3.0, temperature of 45°C, and enzyme concentration of 2.0%. Response surface was used to analyze the three-phase extraction and Box–Behnken design was employed to model algae oil and polysaccharides. The following optimal conditions were obtained by global optimization: 34% mass fraction of ammonium sulfate, 1:2.4 ratio of slurry to t -butanol, 41 min time, 40°C temperature, 35.69% oil yield, and 5.16% polysaccharides yield. The polysaccharides exhibited potential antioxidant activity in DPPH, ABTS, and reducibility assay. The results indicated that the algal polysaccharides may be used as a natural antioxidant in food. Practical applications The application on Schizochytrium limacinum is mainly to extract DHA, but the algal polysaccharide has not been used. Algae oil and polysaccharides are simultaneously extracted from S. limacinum by enzyme-assisted three-phase partitioning (EATPP). The results suggest the EATPP is a novel method to obtain simultaneously oil and polysaccharides.
研究领域:
海洋生物学
·
生物化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Wenli He,Yaqin Sun,Xu Zhou,Lusheng Huang,Zhilong Xiu
In this study, hydrophobic deep eutectic solvents (HDESs) based on trioctylmethylammonium chloride (TOMAC) and medium-chain fatty acids were investigated for the extraction of carboxylic acids. The effects of molar ratio, extraction temperature, vortex time, pH, and carboxylic acid concentration on the partition behavior of carboxylic acids were evaluated. The natural logarithm of partition coefficients (lnK) for six kinds of mono and five kinds of binary carboxylic acids in the TOMAC-OctA system exhibits an excellent linear relationship to the ClogP of carboxylic acids. Quantum chemical calculations using density functional theory showed that one hydrogen bond is formed between lactic acid (LA) and TOMAC-OctA, while double hydrogen bonds between succinic acid (SA) and TOMAC-OctA. However, extraction of butyric acid (BA) is driven by van der Waals force. Furthermore, analysis of the interaction energy revealed that TOMAC-OctA possesses the highest affinity for the extraction of BA, followed by SA and LA.
研究领域:
化学工程
·
环境科学
✓ 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）