ddt dde and ddd in environmental samples
A review on sample preparation and chromatographic determination of acephate and methamidophos in different samples
... 8515 samples were analyzed in year 2006 and 8686 samples in year 2008 Out of all these samples, acephate was detected in 1.11% samples in year 2006, while 5.65% in year 2008 On the other hand, ... Human and animal urine Multiresidue including (2000) spectrometry acephate and methamidophos (Aguera et al., 2002 Tandem mass Vegetables and fruits Multiresidue including ¨ spectrometry acephate and ... using 5% acetone in hexane as extracting solvent and 1-chloro-4-fluorobenzene as an internal standard in fruits and vegetables The limit of detection by the method was found in between 0.005 and...
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Determination of endocrine disrupting compounds in environmental samples using microextraction combined with gas chromatography mass spectrometry
... 49].There is increasing demand on analytical procedures in terms of achieving high enrichment factors and miniaturization to determine ultratrace levels of EDCs in complex environmental samples In sample ... spill incidents between 1993 and 2002, including a major spillage of 28,500 tones of crude oil in the Singapore Straits in October 1997 [28] With continued industrial development and shipping activity ... was removed and 2µl of extract was carefully withdrawn into the syringe and then injected into the GC-MS 15 1.2.2.5.1.2 Basic principles of LPME In LPME, the principles of LLE and the miniaturized...
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Arsenic speciation in environmental and biological samples extraction and stability studies
... were determined in four powder candidate reference materials (prepared within the framework of a European project) of environmental and biological origin: rice, chicken, fish and soil samples Sample ... M 1.0 ml min−1 1.5 ml min−1 0.8 ml min−1 60 ml min−1 200 ml min−1 100 ml min−1 Arsenic 197.26 nm 27.5 mA 35 mA Forward 1350 W Reflected: 2.2 W Coolant: 14 l min−1 Nebulizer: 1.0 l min−1 Auxiliary: ... HNO3 :HCl mixture and 0.5 ml HF were added The mixture was maintained at 150 ◦ C for h After cooling, the digested samples were heated until total elimination of the nitric acid, and finally diluted...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 1 doc
... trademarks, and are used only for identification and explanation without intent to infringe Library of Congress Cataloging -in- Publication Data Analysis of pesticides in food and environmental samples ... determination in food, soil, water, and air, and the results of their monitoring in food and environmental compartments I think that this timely and up-to-date work can significantly improve the information ... fungicides, called demethylase inhibitors, includes various compounds having a heterocyclic N-containing ring, such as azoles, morpholines, pyridines, and piperazines 1.6 TOXICITY AND RISK ASSESSMENT Pesticides...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 2 pdf
... INTRODUCTION The determination of pesticides in food and environmental samples at low concentrations is always a challenge Ideally, the analyte to be determined would be already in solution and ... available and most commonly used in analytical laboratories for the analysis of pesticides in food and environmental samples are described Depending on the kind of sample (solid or liquid) and the ... recirculates continuously by distillation–condensation cycles USE Samples and solvent are placed in a glass vessel and introduced in an ultrasonic bath MAE Sample and solvent are placed in a reaction...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 4 ppt
... Microtiter plate IC and DC ELISA and FPIA 30 ng=mL in urine ng=mL in urine 0.25 ng=mL in assay buffer 0.2–1 ng=mL buffer 0.05–0.3 ng=mL in urine IC50 ¼ 20 ng=mL ng=mL in urine 0.03–0.11 ng=mL ... Determining Pesticides and Metabolites in Biological and Environmental Samples Analyte Sample Matrix 2,4-D 3,5,6-TCP 3,5,6-TCP 4-Nitrophenol parathion Atrazine mercapturic acid DDE Glycine conjugate ... routinely used in medical and clinical settings for the quantitative determination of proteins, hormones, and drugs with a molecular mass of several thousand Daltons (Da) Immunoassay techniques including...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 5 pdf
... assured by careful planning of the sampling program, providing clear instructions for the actual sampling operation including packing and shipping of samples The sampling method depends on the ... distance), spacing, mixing, dividing of samples, and consequently the time required for sampling and the cost of sampling, shipping, and analysis of samples Careful balancing of cost and benefit is a ... sealing, labeling, delivering the samples and the sampling record to the laboratory in unchanged conditions, and assuring integrity of the whole operation Preparation of preprinted sampling record...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 8 pdf
... Martínez, L., and Tadeo, J.L Determination of corn herbicides by GC-MS and GC-NPD in environmental samples, J Agric Food Chem., 42, 2210, 1994 21 Balinova, A.M and Balinova, I Determination of herbicide ... 53, 1996 23 Abian, J., Durand, G., and Barceló, D Analysis of chlorotriazines and their degradation products in environmental samples by selecting various operating modes in thermospray HPLC=MS=MS, ... application of sensors and biosensors in the determination of pesticides in environmental samples is also rapidly increasing These portable analytical devices offer the possibility of in situ analysis...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 9 doc
... compounds from spiked water samples [35], and organochlorine, organophosphorus insecticides, triazine, and neutral herbicides from drinking water [23] For instance, in Ref [36], Empore C18 disks ... the pesticides, and losses occurred with heptachlor, aldrin, and captan Recoveries for vinclozolin and dieldrin from groundwater were lower than those obtained from nanopure water In river water, ... range of polarity in water This method involved passing 4, 2, and L, respectively, of drinking water, groundwater, and river water through a 0.5 g GCB cartridge at 100 mL=min In all cases, recoveries...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 10 pdf
... atmosphere in Japan 10.2.2 SAMPLING AND EXTRACTION OF PESTICIDES 10.2.2.1 IN RAINWATER SAMPLES Sampling of Rainwater Rainwater samples are collected using different systems depending on studies and ... studies in water SPME is a very interesting method for a fast and inexpensive determination of organic pollutants in water, including rainwater The main advantage of SPME techniques is that it integrates ... including GC–ECD and HPLC–UV In the method developed by Millet et al.,46 three fractions were obtained; the first one contains pp0 DDT, pp0 DDD, pp0 DDE, aldrin, dieldrin, HCB, fenpropathrin, and mecoprop,...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 11 pot
... the Sum of DDT and Its Degradation Products DDE and DDD (SDDT) and Sum of HCH Isomers (SHCH) in Fish and Seafood Samples (Unless Otherwise Stated) Place and Year of Sampling Greenland (1994–1995) ... HCH, and dieldrin were detectable in 100%, 70%, and 95% of the cod liver samples, respectively DDT, HCH, and dieldrin were detectable in 100%, 41%, and 94% of the herring samples, respectively DDT, ... (p,p0 -DDE, p,p0 -DDT, and dieldrin) p,p0 -DDE was found in of 20 milkbased infant formulae and residues of p,p0 -DDT were found in one milk-based infant formulae Dieldrin was detected in four...
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Analysis of Pesticides in Food and Environmental Samples - Chapter 12 (end) potx
... the samples that is related to the number of samples and the selection of sampling stations intended within the objectives of the study The sampling process of taking random grab samples and individually ... available for water sampling include continuous, online monitoring systems In such installations, water is continuously drawn from water input and automatically fed into an analytical instrument (i.e., ... 12.1 INTRODUCTION Worldwide pesticide usage has increased dramatically during the last three decades coinciding with changes in farming practices and the increasing intensive agriculture...
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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
... ultrapure water, drinking water, rain water, river water and seawater under various pH and irradiation sources (sunlight, darkness, indoor incandescent lighting and artificial UV lighting) Hydrolysis ... Light intensity could prompt degradation significantly under mild alkaline conditions, while its influence was minor at higher pH (pH > 9) Furthermore, half-lives and degradation rates were obtained ... 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...
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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
... 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 with MAE and intuition, ... temperature, and 6-min microwave heating The differences between the distribution of propoxur and its transformation products in biota and soils, and additionally the difference in the 122 sample ... variables (A, B, C and D), two-variable interaction, and the level setting values of the main variables applied to aquatic animals (goldfish and tortoises) and sea lettuce are displayed in Table 5-1...
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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
... 3) methanol 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) ... temperature 300°C; initial oven temperature 80°C for min, 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 ... PCBs and triazines For example, the recoveries of triazines progressively improved with an increasing degree of moisture in the tested soil This can be explained by the high solubility of triazines...
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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
... the K and t½ in each natural water sample K increases and t½ decreases accordingly when the light intensity increases in the order of darkness, indoor lighting and sunlight This indicates that ... Irradiation darkness indoor lighting a sunlight darkness indoor lighting a sunlight darkness indoor lighting a sunlight darkness indoor lighting a sunlight darkness indoor lighting a sunlight k (h ... degradation of propoxur in water samples We also noticed that degradation was much faster in both seawater and river water than in drinking and rain water This is because dissolved salts and organic matter...
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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
... fresh running water and then rinsed with deionized water The fish samples were grinded in a mortar and pestle with liquid nitrogen until a homogenous fine powder was obtained In order to meet the ... being submerged in liquid nitrogen, and tissues were then crushed and lyophilized Spiked tortoise samples were prepared in a similar manner as the fish The remainders of the fish and tortoise samples ... The instrument was initially tuned based on a mixture of caffeine, L-methionyl-arginyl-phenylananyl-alanine acetate·H2O and a mixture of perfluoroalkoxycyclotriphosphazenes in both positive and...
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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
... rapid and accurate molecular-mass determination for large proteins by means of ESI At present, APCI is commercially available and a growing interest in applications involving biological and environmental ... 1-3 Comparison of the boiling points of solvents in open and closed systems [64] Solvent Dichloromethane Boiling point (°C) in open system 39.8* Boiling point (°C) in closed system (175psi) 140 ... occurs in the negative mode [M+H] + or [M-H] are usually formed to give molecular weight information and structural information is obtained through fragmentation induced in the source by increasing...
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Multi criteria analysis in environmental management: Selecting the best stormwater erosion and sediment control measure in Malaysian construction sites
... required as an input, easiness to understand and use, and so forth The most essential factors for choosing the MCA technique is the easiness of understanding by the analyst, the stakeholders and use ... quality of information (input data) needed and difficulty in obtaining them, ability to handle uncrtaines and availability of user friendly software were also concerns” Ref [17] have indicated ... S The trinity of voice: the role of practical theory in planning and evaluating the effectiveness of environmental participatory processes In communication and public participation in environmental...
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Tài liệu Ethical Issues in Environmental and Occupational Health pptx
... “frame” of numbers of coal miners, the health of miners appears to be diminishing That is, coal mine deaths, per thousand coal-mine employees in the US, have been increasing since 1950 Note that the ... question, influences on the funding of some research projects (and not others), influences on the outcome of research (i.e., findings), and influences on the dissemination of research findings? Are ... genetics and lifestyle are the main causes of cancer Initial questions for discussion: Why you think that environmental and medical communities on the one hand, and governmental and industrial...
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