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Uncertainty Evaluation For Determination Of Isocarbophos Residues In Tea By Quechers-Gas Chromatography-Tandem Mass Spectrometry, Lu Zhenhua, Yu Lifang, Cai Danping, Li Cheng
Uncertainty Evaluation For Determination Of Isocarbophos Residues In Tea By Quechers-Gas Chromatography-Tandem Mass Spectrometry, Lu Zhenhua, Yu Lifang, Cai Danping, Li Cheng
Food and Machinery
Objective:The uncertainty of determination of Isocarbophos residues in tea by using QuEChERS-gas chromatography-tandem mass spectrometry techniqne was evaluated. Methods:Isocarbophos residues in tea was determined by using "GB 23200.113—2018 National food safety Standard-Determination of 208 pesticides and metabolites residues in plant origin-Gas chromatography-tandem mass spectrometry method", and factors in the determination of isocarbophos were analyzed by establishing a mathematical model, including sample weighing, volume, calibration of standard solutions, repeatability and recovery rate, etc.. Results:When the residual amount of isocarbophos in tea was 0.050 mg/kg, the expanded uncertainty was 0.007 mg/kg, and the determination result was expressed as:ω …
Uncertainty Evaluation For The Determination Of Natural Capsaicin, Dihydrocapsaicin And Synthetic Capsaicin In Edible Oils And Fats By Lc-Ms/Ms, Huang Hui, Liao Yan-Zhi
Uncertainty Evaluation For The Determination Of Natural Capsaicin, Dihydrocapsaicin And Synthetic Capsaicin In Edible Oils And Fats By Lc-Ms/Ms, Huang Hui, Liao Yan-Zhi
Food and Machinery
Objective: Uncertainty assessment of the content of synthetic capsaicin, natural capsaicin and dihydrocapsaicin in edible oils and fats by liquid chromatography-mass spectrometry was carried out, and the sources of uncertainty and the key factors affecting the test results were analyzed, so as to improve the accuracy of test results.Methods: To establish a mathematical model for the uncertainty of the content of synthetic capsaicin, natural capsaicin and dihydrocapsaicin in edible oils and fats, to analyze the factors that may introduce uncertainty in the detection process, and to evaluate each uncertainty component.Results: The contents of synthetic capsaicin, natural capsaicin and …
Evaluation On Uncertainty Of Advantame In Syrups Determined By High Performance Liquid Chromatography, Lei De-Qing, Zhong Fei-Fei, Zhou Jin-Sha, Liu Bo, Wang Zi-Qian, Zhou Ya-Min
Evaluation On Uncertainty Of Advantame In Syrups Determined By High Performance Liquid Chromatography, Lei De-Qing, Zhong Fei-Fei, Zhou Jin-Sha, Liu Bo, Wang Zi-Qian, Zhou Ya-Min
Food and Machinery
Objective: This study aimed to evaluate the uncertainty of determination by high performance liquid chromatography (HPLC) for the content of adevantame, a synthetic sweetener illegally added in syrup drugs. Methods: The sample is diluted with solvent, and the content of adevantame in the sample was determined by HPLC. Through the analysis of the factors affecting the uncertainty, such as the preparation of the reference solution, curve fitting, sample weighing, sample volumetric determination and instrument precision, the uncertainty was synthesized of each component, and the extended uncertainty is calculated. Results: The expanded uncertainty is 1.8 μg/mL. The influence …
Evaluation Of Uncertainty In Determination Of Five Kinds Of Carbamate Pesticide Residues In Apple By Liquid Chromatography-Post-Column Derivatization, Yu Xing, Chang Wei, Wang Yong-Lin, Yao Zeng
Evaluation Of Uncertainty In Determination Of Five Kinds Of Carbamate Pesticide Residues In Apple By Liquid Chromatography-Post-Column Derivatization, Yu Xing, Chang Wei, Wang Yong-Lin, Yao Zeng
Food and Machinery
Objective: This study aimed to analyze the accuracy of determination results of five kinds of carbamate pesticide residues in apple. Methods: Five kinds of carbamate pesticide residues in apples were detected according to NY/T 761—2008, and the uncertainty of the determination process was evaluated and analyzed. Results: The contents of carbosulfur, methomyl, 3-hydroxycarbamate, aldicarb and isoprocarb in apples are expressed in the form of expanded uncertainty as (0.105 7±0.007 8), (0.107 7±0.006 2), (0.109 2±0.005 8), (0.103 9±0.008 4), (0.106 1±0.007 6) mg/kg (k=2). Conclusion: The main sources of uncertainty in the experiment are standard material, …
Uncertainty Evaluation On Determination Of Statins In Health Food By Gas Chromatography Mass Spectrometry (Gc-Ms), Zhang Li-Xia, Guo Qing-Yuan, Hua Qi-Cheng, Li Xiang-Mei
Uncertainty Evaluation On Determination Of Statins In Health Food By Gas Chromatography Mass Spectrometry (Gc-Ms), Zhang Li-Xia, Guo Qing-Yuan, Hua Qi-Cheng, Li Xiang-Mei
Food and Machinery
Objective:In presence of measurement uncertainty evaluation, the detection methods, with water-sodium chloride pretreatment, for health food was evaluated.Methods:A mathematical model was established to analysis of uncertainty sources. Then the individual components of uncertainty were evaluated. Finally, the combined uncertainty and extended uncertainty were calculated.Results:The uncertainty caused by several factors, including the fitting of the standard curve, the preparation of solution and standard, the repeatability of measurement, and the weigh of sample.The contents of mevastatin, lovastatin and simvastatin were 0.099 2, 0.101 0, 0.099 5 mg/kg in health foods, respectively. The relative combined standard uncertainties were …
Evaluation Of Uncertainty In The Determination Of Acid Scarlet Gr In Orange Juice By High Performance Liquid Chromatography, Yuan Yuan, Zeng Hui, Xiao Yan, Yang Li-Xia, Cui Xiao-Jiao, Yang Yun, Wu Hou-Lu
Evaluation Of Uncertainty In The Determination Of Acid Scarlet Gr In Orange Juice By High Performance Liquid Chromatography, Yuan Yuan, Zeng Hui, Xiao Yan, Yang Li-Xia, Cui Xiao-Jiao, Yang Yun, Wu Hou-Lu
Food and Machinery
Objective:The uncertainty of the determination of acid scarlet GR in orange juice by high performance liquid chromatography (HPLC) was evaluated. The source of uncertainty and the key factors affecting the test results were analyzed, so as to improve the accuracy of the test results.Methods:The mathematical model of uncertainty of acid scarlet GR content in orange juice was established. The factors that may introduce uncertainty in the detection process were analyzed, and the uncertainty components were evaluated.Results:The content of acid scarlet GR in self-made positive orange juice was 1.46 mg/kg, the expanded uncertainty was 0.11 mg/kg …
Discrete Choice Experiments In Agricultural And Food Economics: Two Essays On Information Provision Modalities, Uncertainty Adjustment, And Hypothetical Bias, Monsoïa Arsène Juste Agossadou
Discrete Choice Experiments In Agricultural And Food Economics: Two Essays On Information Provision Modalities, Uncertainty Adjustment, And Hypothetical Bias, Monsoïa Arsène Juste Agossadou
Graduate Theses and Dissertations
Stated discrete choice experiments are extensively used in applied economics to study preferences and valuation for new products, as well as costs and benefits of new policies and programs. Moreover, information provision experiments widely use the method to examine information effects on different outcomes. This thesis explores two methodological issues in discrete choice experiments: (i) information provision modalities and (ii) hypothetical bias. The first study examines the effect of information modality by testing the effect of using combined text script and audio clip (treatment) versus only text script (control) to convey information in discrete choice experiments. Specifically, the study elicits …
Uncertainty Evaluation Of Cadmium Content In Kelp (Laminaria Japonica) By Graphite Furnace Atomic Absorption Spectrometry, Liu Lan-Ying, Lu Xin, Li Ying, Luo Tu-Yan
Uncertainty Evaluation Of Cadmium Content In Kelp (Laminaria Japonica) By Graphite Furnace Atomic Absorption Spectrometry, Liu Lan-Ying, Lu Xin, Li Ying, Luo Tu-Yan
Food and Machinery
Objective: To improve the accuracy of the results of cadmium (Cd) content in kelp (Laminaria japonica) by graphite furnace atomic absorption spectrometry (GF-AAS). Methods: The concentration of Cd element in kelp sample was measured by using GF-AAS after microwave digestion according to the standard of GB 5009.15—2014. Combining with the experimental process and mathematical model, the possible sources of measurement uncertainty were firstly identified, then the components of each standard uncertainties were calculated, and finally each parameter of uncertainties was synthesized, and the whole uncertainty was evaluated. Results: when the value of Cd concentration in kelp was 0.202 …