Ya Yang

Kunming Institute of Botany

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Ping Lü

Guizhou University

Deyu Hu

Guizhou University

Xiangwu Liu

China University of Petroleum, Beijing

Qingtao Zhang

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

Deyu Hu

Guizhou University

Yurong Yu

Guizhou University

Ya Chen

Sinopec (China)

Chen Ya

Hefei University of Technology

Yao Deng

Ningbo University

Xiaoxia Jiang

Ningxia University

Cooperative Institutions

Guizhou University

Chinese Academy of Sciences

Ministry of Education of the People's Republic of China

Kunming Institute of Botany

Sichuan University

Institute of Tibetan Plateau Research

University of Chinese Academy of Sciences

Guizhou Normal University

Second Affiliated Hospital of Xi'an Jiaotong University

Xi'an Jiaotong University

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Study on the Influence of Pit Excavation on the Stability of Underground Openings Using Different Models

Applied Mechanics and Materials (2013)

Ya Yang Guojian Shao Jing Fu Yu Guang Yuan Chen

Simplified plane strain model and 3-D model were used to research the influence of pit excavation on the stability of underground openings using the finite element method (FEM). Conclusion from the 3-D FEM study is that the central region of the pit will have a large springback deformation and the openings will also float up at the same time because of large ranges of pit excavation. When using the simplified two-dimensional plane strain model for the analysis of this problem, the size of the excavation region leads directly to two completely inconsistent results. If the excavation region was wider than the openings the springback deformation would be obtained, while the settlement would be obtained if the opening was wider than the excavation region. Therefore the two-dimensional plane strain model is not proper for the analysis of the stability of the openings under this condition.

Settlement (finance)

Plane stress

10.4028/www.scientific.net/amm.353-356.1466

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Preliminary Application of Feynman Learning Method to Online Education to Cultivate Comprehensive Ability of Nursing Undergraduates

Journal of Research in Vocational Education (2023)

Ya Yang Chunhua Fan Shan Luo

The development of Feynman learning normal teaching mode, combining the traditional "input teaching" mode with Feynman learning method "output learning" mode is not only conducive to improving the quality of talent training, but also conducive to the improvement of teaching quality and teacher level.To explore the preliminary application effect of Feynman learning method in the teaching of nursing undergraduates.

10.53469/jrve.2023.05(08).04

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Dissipation, residues, and risk assessment of imidacloprid in Zizania latifolia and purple sweet potato under field conditions using LC-MS/MS

Journal of Environmental Science and Health Part B (2018)

Yurong Yu Shouyi Wang Qingtao Zhang Ya Yang Chen Ya

A shortened version of Quick, Easy, Cheap, Effective, Rugged, and Safe method (QuEChERS) for determining the dissipation and residue of imidacloprid present in Zizania latifolia and purple sweet potato was established by using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The average recoveries of imidacloprid in the two crops ranged from 82.12 to 113.79%, with relative standard deviation (RSD) of <7.32%. The dissipation dynamics of imidacloprid in Z. latifolia plants and purple sweet potato plants followed first-order kinetics, with half-lives of 3.2-5.5 days in each of sampling locations. The terminal imidacloprid residues in Z. latifolia and purple sweet potato at each of location were <0.005-0.120 mg kg-1. According to the risk assessment results, both the acute dietary risk quotient and chronic dietary risk quotient values were <1, indicating that imidacloprid is unlikely to pose health risks to humans with normal recommended use. The present study may serve as a valuable reference for the safe and reasonable use of imidacloprid in Z. latifolia and purple sweet potato fields.

QuEChERS

Residue (chemistry)

10.1080/03601234.2018.1531661

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Kinetics of the photolysis of pyridaben and its main photoproduct in aqueous environments under simulated solar irradiation

RSC Advances (2022)

Mengyuan Pan Shiyin Mu Yunfang Li Ya Yang Yuping Zhang

The photolytic fate of pyridaben and its main photolysis product was investigated in different aqueous solutions. Results showed that the photolysis of pyridaben followed pseudo first-order kinetics or the hockey-stick model. In buffer solutions, the half-life of pyridaben was the shortest at pH 4, while the degradation rate within 24 h was the highest at pH 9. Humic acids (HA) at concentrations of 1-20 mg L-1 favored the photolysis of pyridaben while fulvic acids (FA) did not have a significant effect. Nitrate at low concentrations (0.01 mM) accelerated the photolysis and Fe(iii) at high concentrations (0.01 and 0.1 mM) significantly inhibited the photolysis. The photolysis rate of pyridaben in rainwater, tap water, and river water was significantly higher than that in distilled water. The half-lives in distilled water, rainwater, tap water, river water, and pond water were 2.36, 1.36, 1.61, 1.77, and 2.68 h, respectively. Ultra-high-performance liquid chromatography/high-resolution mass spectrometry identified M328 as a photolysis product. The degradation of M328 followed pseudo first-order kinetics in distilled water, buffer solutions and aqueous solutions fortified with HA. The half-lives of M328 were in the range of 7.07-13.95 h. These results are essential for further environmental risk assessment of pyridaben.

10.1039/d2ra02601e

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Dissipation, Processing, Leaching, and Safety Evaluation of Flonicamid and Its Metabolites in Tea

Journal of AOAC International (2020)

Ya Yang Xiangwu Liu Qingtao Zhang Ya Chen Sumei Zhang

Abstract Background Tea is a popular traditional non-alcoholic beverage worldwide. Flonicamid is a selective systemic pyridine carboxamide insecticide that is widely used for controlling tea leafhopper in tea. Objective The leaching rates, dissipation dynamics, and residue levels of flonicamid and its metabolites in tea leaves during processing and transferring were investigated to validate the safe risk in tea and transfer behavior using high performance liquid chromatography–tandem mass spectrometry with a convenient pretreatment method. Method The extracting method and immersion rate experiments were optimized by single factor analysis and orthogonal tests. The acetonitrile extracting solvent with 0.5% formic acid was used and optimal leaching conditions were obtained with a regime of 15 min immersion time, 100°C temperature, three immersions and a tea-to-water ratio of 1:50. Results Average recoveries in processed green tea and infusions were 80.85–98.75% with relative standard deviations <5.87%. LODs and LOQs of flonicamid, 4-trifluoromethylnicotinic acid (TFNA), N-(4-trifluoromethylnicotinoyl) glycine (TFNG), and 4-trifluoromethylnicotinamide (TFNA-AM) were 0.0013–0.350 and 0.004–1 μg/g, respectively. The processing factor of flonicamid was 0.36–5.52 during green tea manufacture. The leaching rates were 22.9-97.4% from processed tea to infusion. Conclusions The risk of long-term and short-term dietary intake of flonicamid was safe in tea infusions with the risk quotient (RQ) values <1 for the Chinese consumer. This work may provide guidance for safe and reasonable consumption of flonicamid in tea in China. Highlights The suitable leaching factors of flonicamid and its metabolites in tea infusions were optimized by orthogonal experimentation for the first time.

10.1093/jaoacint/qsaa052

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Citations (3)

Development and Validation of a Liquid Chromatography–Tandem Mass Spectrometry Method for Multiresidue Determination of 25 Herbicides in Soil and Tobacco

Chromatographia (2019)

Ya Chen Yurong Yu Xiangwu Liu Ya Yang Ping Lü

10.1007/s10337-019-03834-6

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Insight into the differences in the toxicity mechanisms of dinotefuran enantiomers in zebrafish by UPLC-Q/TOF–MS

Environmental Science and Pollution Research (2022)

Xia Zhou Ya Yang Renyue Ming Hong Chen Deyu Hu

Metabolic pathway

10.1007/s11356-022-20424-6

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Residue determination and risk assessment of benziothiazolinone in citrus by LC-MS/MS

International Journal of Environmental & Analytical Chemistry (2019)

Xiangwu Liu Bangyan Song Xiaoxia Jiang Ya Yang Ping Lü

A quick, easy, cheap, effective, rugged and safe liquid chromatography-tandem mass spectrometry technology was used to determine benziothiazolinone in citrus. Orthogonal test and single-factor analysis were conducted to identify the optimal extraction method of benziothiazolinone. The good linearity (R2 > 0.9949), high accuracy and precision, matrix effect and satisfactory recoveries (79.31%–98.68%) at three spiked levels (0.02, 0.2 and 2 mg/kg) with low relative standard deviation values (0.63%–8.68%) were validated. The limits of detection and quantification were within 0.2–0.8 and 20 μg/kg, respectively. This study could provide guidance for the reasonable use of this fungicide and for the establishment of maximum residue level.

Residue (chemistry)

Relative standard deviation

10.1080/03067319.2019.1670825

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New Process for Extracting Oil and Starch from Tea Seeds

Journal of Food Science and Engineering (2013)

Jiang JinZhong Cuijuan Ren Wang ZiBu Changjiang Qian Yuxiao Shen

A new process for extracting oil and starch from tea seed was introduced.The new process included one special link compared with all of the processes used now for tea seed oil and starch production.The link was static fermentation by which oil bodies and starch were separated naturally from tea seeds.By the process, tea seed oil and starch which were in conformity with government standards about edible oil and starch were successfully produced with 16% and 8% of production rate, respectively.The new process has many advantages, such as more simple equipments, lower production cost and whole natural products, etc..

10.17265/2159-5828/2013.12.008

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Degradation of Sulfoxaflor in Water and Soil: Kinetics, Degradation Pathways, Transformation Product Identification, and Toxicity

Journal of Agricultural and Food Chemistry (2022)

Ya Yang Lulu Ran Ting‐tiao Pan Fang Yuan Deyu Hu

Hydrolysis, photolysis, and soil degradation are important degradation pathways of pesticides and might generate toxic chemicals and pose threats to the environment. Sulfoxaflor is a widely used neonicotinoid pesticide, but few studies have been conducted to research its environmental behaviors and residues. Herein, the hydrolysis and photolysis of sulfoxaflor in water and degradation in four typical Chinese soils were systematically studied. In addition, degradation products, pathways, and toxicity to Daphnia magna were also investigated. Sulfoxaflor can undergo photolysis and soil degradation, and the degradation percentage was greater than 90% after 96 h or 96 days, respectively. However, sulfoxaflor was not degraded or only slightly degraded during in hydrolysis and was not photodegraded in acidic water or sterilized soil. Four degradation products were screened by UHPLC-Q-Orbitrap-HRMS, three candidates (X11719474, X11721061, and X11718922) were synthesized, and the photolysis and soil degradation kinetics were explored. The possible pathways were elucidated. Sulfoxaflor, X11718922, and X11721061 had a low toxicity, and X11719474 (48 h EC50 0.74 mg/L) had a high toxicity to Daphnia magna. Thus, sulfoxaflor and its degradation products could induce tissue damage in Daphnia magna. This work offers a theoretical basis for the application and ecological risk assessment of sulfoxaflor.

Daphnia magna

Degradation

Pesticide degradation

10.1021/acs.jafc.1c07362

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Citations (15)