applications in the analysis of environmental samples
Development and application of liquid phase microextraction techniques in the analysis of environmental pollutants
... concentrations of organic substances in the aqueous environment has been a matter of increasing interest to the water industry, scientists and the general public alike, from the point of view of possible ... While the kinetics of the process were not described in detail, the importance of convective transport of analyte was highlighted The advantages of the drop-indrop system include low consumption of ... aspiration of the ASP, following the first sampling cycle, ensures that both the OF and the ASP are periodically renewed, and thus the OF would be in contact with fresh aqueous sample having the initial...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 6
... underwent thermal degradation under the extraction conditions The results indicate that although carbamates tested in this study are thermally labile, there was little observable degradation under the ... used to investigate the chemical degradation behavior of N-methylcarbamate in environmental water samples Propoxur was selected as a model compound to study the degradation behavior in ultrapure ... irrespective of the type of water matrix Light intensity could prompt degradation significantly under mild alkaline conditions, while its influence was minor at higher pH (pH > 9) Furthermore, half-lives...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 5
... optimization of the MAE conditions To apply these techniques in practical applications, in this chapter I 138 demonstrated the application of these techniques in analysis of the residues of Nmethylcarbamate ... Fig 5-4 shows the change in concentration of each of the analytes in the goldfish extracts with time From the figure, it can be seen that neither a decrease in the concentration of the extracts ... not considered was the power setting for the microwave heating This setting was proportional to the number of samples undergoing extraction during one run Furthermore, according to previous experience...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 4
... increased to 200°C at a rate of 25°C/min, then maintained at 200°C for min; a second ramp 230°C at rate of 5°C/min, increased to 280°C at a rate of 20°C/min; The final temperature of 280°C was held for ... 88 An interesting result observed from Fig 4-6 is that in the same solvent, the recovery increases in going from PAHs to PCBs, and then to triazines (i.e, increasing polarity of analyte) The recovery ... direct extension of 2-level OAD with the added capability of providing information about the non-linearity of the main factors in the response surface However, the method as described in a work by...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 3
... k is the first-order rate constant, which is calculated as the negative slope of the regression line where the natural logarithm of the percentage of the compound remaining is plotted against ... application of LC-APCI-MS for the determination of carbamates: carbofuran and 3hydroxy-carbofuran, and the analysis of triazine herbicides in water [8] LC-ESI-MS has been also successfully applied for the ... light intensity increases in the order of darkness, indoor lighting and sunlight This indicates that light exposure can prompt hydrolysis in various types of natural water Thus the effect of light...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 2
... possible trace organic contaminants prior to preparation, all of them were washed in fresh running water and then rinsed with deionized water The fish samples were grinded in a mortar and pestle with ... 60mesh sieve In order to remove possible traces of PAHs, PCBs, triazines, carbamates and other organic contaminants, 100 g of each of the soil sample was immersed in 200 ml 46 each of methanol, ... analysts in soil samples before spiking 2.3.2.2 Freshly spiked soils Freshly spiked soil samples were prepared by adding an appropriate volume of spiking solutions into the soils To ensure that the...
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Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 1
... In almost all cases higher recoveries were obtained from the spiked samples, demonstrating the effect of the stronger binding to the matrix in native samples [77] Furthermore, in many cases the ... principle of MAE The principle of MAE is based on heating the extractants (mostly liquid organic solvents) in contact with the sample with microwave energy [58] Partitioning of the analytes of ... microwave-absorbing properties of the solvent, the interaction of the solvent with the matrix, and the analyte solubility in the solvent Preferably, the solvent should have a high selectivity towards the...
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Applications of capillary electrophoresis in the analysis of natural products
... cathode The migration of cations results in the migration of whole buffer solution through the capillary; this migration is the EOF Since the driving force of EOF is uniformly distributed along the ... used in both the conviction of guilty offenders and the appraisal of the consanguinity Amino acids, peptides and proteins Proteins are very important to life, the complex molecules of proteins ... numbers), the number of double bonds and also the exact position of these double bonds, this will define the biological reactivity of the fatty acid molecule and even of the lipid containing these...
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Báo cáo khoa học: "PARSING VS. TEXT PROCESSING IN THE ANALYSIS OF DICTIONARY DEFINITIONS" pot
... passives inverted, inflected forms analyzed, and other modifications of the kind often brought under the rubric of "transformations." The LSP can this sort of thing very welL The defining words ... most of the duplicate relational triples Finding relational triples by text processing As the performance statistics above show, parsing is painfully slow For the simple business of finding and ... treat it as an independent piece of code Having done this, we were able to add new relations in the com~e of developing the grammar Approximately a third of the definitions in the sample could...
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Báo cáo y học: "Computational challenges in the analysis of ancient DNA" ppsx
... seemingly paradoxical result can be explained in the following way The chance of finding a seed-match and of producing a local alignment of significant similarity rises with the length of the ... (Figure S3 in Additional file 1) Therefore, requiring a minimum distance in bitscore between the best and second best hit is Page of 15 very effective in removing most of the remaining reads that ... location of the human and chimp hits for each read is verified by using liftover [50] to map the coordinates of the human hit to the chimpanzee genome and the coordinate of the chimpanzee hit to the...
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Báo cáo hóa học: " Some new nonlinear integral inequalities and their applications in the qualitative analysis of differential equations" potx
... prove the global existence of the solutions of a delay differential equation, while in the second example, we will obtain the bound of the solutions of an integral equation For the sake of proving ... general theorems and establish some new integral inequalities Also we will give some examples so as to illustrate the validity of the present integral inequalities Main results In the rest of the ... and Feng Journal of Inequalities and Applications 2011, 2011:20 http://www.journalofinequalitiesandapplications.com/content/2011/1/20 Page of 15 Theorem B: Under the hypothesis of Theorem B, if...
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A discourse analysis of presuppositions in the declaration of independence made by president ho chi minh = phân tích diễn ngôn các tiền giả định trong tuyên ngôn độc lập của chủ tịch hồ chí minh
... Strikingly, the definite article the is used most Such expressions as the earth, the world appear to be the fixed principles of using the articles in the field of 30 grammar In grammar, the ... action, responding to the arguments of the opponents and foreseeing opposing dangers 33 Secondly, in quoting the declarations of independence of America in 1776 and the declaration of the French ... discourse analysis involves the study of language in use A wide range of linguistic texts are explored in the study of discourse These might be in either spoken or written form, including a conversation...
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An analysis of errors made by high school student in the use of subject verb agreement in english writing = phân tích lỗi sai của học sinh PTTH về sự tương hợp giữa chủ ngữ và động từ trong văn viết tiếng anh
... However, they mainly focus on the theory of SVA To the best of my knowlege, very little research so far has been done in Vietnam on the error analysis in the area of English SVA In the thesis by ... school students in the use of subject- verb agreement in English writing Aims of the study The study reported in this thesis aims to: - Identify the errors in using SVA in English writing made by ... three main parts Part I: Introduction In the introductory part, the rationale of the study is presented The aims, subjects, scope and method of the study are then identified The design of the study...
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The analysis of theme and rheme in little house on the prairie = sự phân tích về đề ngữ và thuyết ngữ, thông qua truyện ngôi nhà nhỏ trên thảo nguyên
... about later in Rheme In other words, Theme is the starting point of the utterance or point of departure of the message In many cases (Unmarked), the Theme of a Declarative sentence will be the grammatical ... that of the Interrogatives is the Interrogative word and that of the Imperatives is the Imperative form of the verb And Rheme is the remainder of the message, and also the part in which the Theme ... Interpersonal Themes, on the other hand, reveal something of the attitude of the speaker or the writer And Textual Theme is the link between the clause contains that Theme and the rest of the discourse...
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Tài liệu Báo cáo khoa học: A systems biology approach for the analysis of carbohydrate dynamics during acclimation to low temperature in Arabidopsis thaliana doc
... successful metabolic engineering of freezing tolerance in plants should include such an analysis of the dynamics of metabolism to gain comprehensive information about the effects of individual overexpression ... suggest increasing the maximum activities of enzymes participating in sucrose cycling Assuming that Rsch is optimized for cold acclimation, we suggest, on the basis of the results of the in silico ... uptake per hour Data points were spline-interpolated to obtain timecontinuous information on net photosynthesis during the whole period of cold exposure The rate of raffinose synthesis, rSuc fi Raf,...
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Tài liệu A REVIEW OF INDOOR AIR POLLUTION AND HEALTH PROBLEMS FROM THE VIEWPOINT OF ENVIRONMENTAL HYGIENE: FOCUSING ON THE STUDIES OF INDOOR AIR ENVIRONMENT IN JAPAN COMPARED TO THOSE OF FOREIGN COUNTRIES pptx
... predominantly in indoor air samples. 93) The dominant path of phthalates intake was the ingestion of foodstuffs compared to inhalation of indoor air by children.94) n-Tetradecane is an alkane with the ... to inferior indoor air quality from the viewpoint of environmental hygiene, but it is not sufficient Continuous efforts should be made to improve the health of both of the individuals and the ... on the health effects of these particles.119) Heavy Metal/Lead Although the lead concentration in indoor air is lower in Japan than in other developed countries, the source of lead contamination...
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Tài liệu Aesthetic preferences and the attribution of meaning: Environmental categorization processes in the evaluation of urban scenes ppt
... the subjects interviewed Exploring the generality of such a categorization in other geographical scenes, incorporating the analysis of places considered ‘‘unattractive,’’ is one of the aims of ... place themselves on the other side of the aesthetic spectrum and name, in their opinion, the three ‘‘most unattractive’’ places in the city These places were assessed with the same variables as the ... evidence of the existence of this association in urban settings Within this framework, the overview guiding the design of this study is establishing categories of urban places from the perspective of...
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Tài liệu STRATEGIC ENVIRONMENTAL ASSESSMENT on shrimp farms in the southeast of Thailand docx
... from the earthen shrimp ponds and leakage from sludge piles during rainfalls In the south of Thailand, the most obvious impact from the leaking of brackish water to the surroundings is the loss of ... environmental work in the sector, including legislation and environmental regulations • Other relevant information on the institutional situation • An analysis of the combined effects of different ... cultivation into intensive farming of the Black tiger shrimp and became the leading shrimp producing nation in the world Other Southeast Asian countries followed the Taiwanese example and in many...
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The analysis of AHAs in cosmetic
... analysis By comparing the ratio of the peak area of the sample to the internal standard and calibration curve, we obtained the concentration of each sample RESULTS AND DISSCUSSION I Analysis Method ... 13.4 minutes respectively The retention time for the internal standard, Maleic acid, was 12.6 minutes Through the analysis of LC-MS, the peak shown at 15.5 minutes was proved to be an impurity of ... applied on the assay of Glycolic acid, dl-Malic acid, Lactic acid and Citric acid Recoveries of AHAs in synthetic samples are shown in Table The recovery rates of these four AHAs in cosmetics...
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Tìm thêm: hệ việt nam nhật bản và sức hấp dẫn của tiếng nhật tại việt nam xác định các mục tiêu của chương trình xác định các nguyên tắc biên soạn khảo sát các chuẩn giảng dạy tiếng nhật từ góc độ lí thuyết và thực tiễn khảo sát chương trình đào tạo của các đơn vị đào tạo tại nhật bản khảo sát chương trình đào tạo gắn với các giáo trình cụ thể tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam điều tra với đối tượng sinh viên học tiếng nhật không chuyên ngữ1 khảo sát thực tế giảng dạy tiếng nhật không chuyên ngữ tại việt nam nội dung cụ thể cho từng kĩ năng ở từng cấp độ xác định mức độ đáp ứng về văn hoá và chuyên môn trong ct mở máy động cơ rôto dây quấn các đặc tính của động cơ điện không đồng bộ hệ số công suất cosp fi p2 đặc tuyến hiệu suất h fi p2 đặc tuyến mômen quay m fi p2 đặc tuyến tốc độ rôto n fi p2 đặc tuyến dòng điện stato i1 fi p2 sự cần thiết phải đầu tư xây dựng nhà máy chỉ tiêu chất lượng 9 tr 25