determination of flame retardants in environmental samples

... to headspace of a solution containing 200 µl of BSTFA in ml of acetone (in a 10-ml vial) for 10 minutes at 70ºC The fiber was then desorbed in the injection port of the GC for minutes Figure ... 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 ... 1.2.2.5.1.2 Basic principles of LPME In LPME, the principles of LLE and the miniaturized nature of SPME are combined to realize the advantages of both techniques Briefly, the analytes of interest are...

Ngày tải lên: 16/09/2015, 17:12

... provides procedures for determination of organic compounds in finished drinking water, source water, or drinking water in any treatment stage The method is applicable to a wide range of organic compounds ... surrogate in µg/L in the water sample Ax = integrated abundance of the quantitation ion of the analyte in the sample Ais = integrated abundance of the quantitation ion of the internal standard in the ... recovery of the internal standards in laboratory fortified blanks and samples Internal standard recovery should be in excess of 70% 9.5 With each batch of samples processed as a group within a 12-hour...

Ngày tải lên: 22/03/2014, 14:20

... decreasing the error rate and using statistical analysis for generating new rules References Timo J~irvinen 1994 Annotating 200 Million Words: The Bank of English Project In Proceedings of COLING-94 ... errors occurred during determination of apposition and the third biggest group of errors exists in sentences there one clause divides the other into two parts In experiment A, 86-88% of words become ... (except finite verbs and conjunctions) Results To evaluate the performance of parser I use two types of corpora Training corpus is used for formulating rules and preliminary testing After testing...

Ngày tải lên: 24/03/2014, 03:21

... determine the rate of biodegradation of specific contaminants in groundwater during a field study Mass flux of the studied contaminant through a line/cluster of wells (a transect) is recorded instead ... reached as a final timepoint, an earlier time was chosen for the kinetics calculation, if possible; the use of zero as a denominator in the first-order rate equation would result in an “infinite” value ... leveled off at that point for the remainder of the experiment, the final concentration and time were chosen at the point where the concentration leveled off In column studies, the time field in the...

Ngày tải lên: 28/03/2014, 19:20

Ngày tải lên: 28/03/2014, 20:20

... part is prepared in line with the guidelines of the Faculty of Social Sciences of the University of Dhaka (DU) 10 Figure-2.5.1: Distribution of Marks for Evaluation for the MEcon in Environmental ... highly trained economists in a growing economy like Bangladesh is increasing day by day Due to many emerging challenges pertaining to economic activities, particularly in the perspective of socio-economic ... ‘centre of excellence’ in a discipline like economics as encouraging research and getting them published in a systematic and scientific manner should be an integral part of an institute of higher...

Ngày tải lên: 31/03/2014, 03:20

... New findings out of the thesis This thesis presents the following new findings (1) New findings related to theory (a) A new economic equation to relate two levels of sustainable management of economic ... Original Sustainability, S for Sustainable Level for human activities ΔOS means the marginal increase of consumption against environmental amenity while original sustainability is maintained The degradation ... became increasingly criticized by international activists as a source of poverty and environmental degradation in developing countries One of the most important turning point was the WTO Ministerial...

Ngày tải lên: 20/04/2014, 20:22

... title «Genetics and breeding of (1986) Oak breeding in Germany; experiences and problems In: Proceedings IUFRO Joint Meeting of Working Parties on Breeding Theory, Progeny Testing and Seed Orchards ... Genetic variations in wood properties In: New Perspectives in Wood Anatomy (Baas P, ed), Martinus Nijhoff, The Hague, 151-169 Cinotti B (1991) Recherche de propriétés intrinsèques du bois pouvant ... determine provenance variations in vessel size; 2) estimate the heritability of vessel size; and 3) to find a means of recognizing shake-prone trees so that they could be removed during early thinning...

Ngày tải lên: 08/08/2014, 19:21

... Table 1) of which the mRNA levels were mainly high in G2/M cells (Figure 4b) WEE1/MYT1/MIK1 kinases Figure Cyclin-dependent kinase cyclin-binding motifs Alignment of the cyclin-binding motifs of all ... th Number of proteins matching the cyclin HMMER profile 28 57 19 19 12 12 5 8 144 29 Number of proteins with an InterPro cyclin domain 27 55 18 18 12 12 5 140 27 IPR004367 Cyclin, Cterminal - - ... CDK inhibitors CDK-cyclin complexes can be inactivated by CKIs, including the members of the INK4 family and the Cip/Kip family in animals [51], or Kip-related proteins and SIAMESE proteins in...

Ngày tải lên: 09/08/2014, 20:21

... measure intracellular Ca2+ ions by using microscopy imaging techniques To introduce this dye into intact pistils, we injected the Fluo-3 solution directly into olive inflorescences To Page of 12 ... solution of mM Fluo-3 AM in DMSO The final DMSO concentration in the incubation solution was approximately 1% (v/v) Injection was done directly into the peduncle of the inflorescence at the site of ... and a fine needle (diameter, 60 μm) (Bionovo, Legnica, Poland) Into each inflorescence, 100 μl of dye solution was injected Control samples were injected with 100 μl of solution containing 1%...

Ngày tải lên: 11/08/2014, 11:21

... uniform injection of the sample into the boat by wicking any remaining drops of the sample from the tip of the syringe needle prior to introduction of the sample into the furnace Consult instrument ... Time of Sample in Furnace—Insert the boat into the furnace using a drive rate of 140 to 160 mm/min (Model 735 setting of 700-750) Additional slowing of boat speed or a brief pause of the boat in ... syringe needle into the injection inlet and allow the needle/ septum blank to dissipate Reset the instrument baseline or enable integration, if required, prior to the injection of the syringe...

Ngày tải lên: 20/10/2014, 17:16

... Declaration of 1992, governments and people of the global community reinforced their commitments to environmental sustainable society for the offspring of all human beings Especially, a number of new international ... purpose of this thesis is to examine how International Agreements envisage to contributing to conservation of the global environmental assets that are diminishing rapidly at an increasing rate In ... 2007 INTRODUCTION Necessity of the thesis topic Reflecting the growing concerns of global community on rapid depletion of tropical forests, and responding to their determinations stated in Rio...

Ngày tải lên: 17/03/2015, 13:26

... heating rate 20 oC/minute and N2 gas flow 15-20 mL/minute Combining with the purpose of saving energy, the results of XRD and FTIR give 600 oC as the best temperature for reduction The yield of ... 1700 -1730 cm-1) in the samples Beside the carbony group, there are other groups existed in these samples C–O in the range of 1200-1250 cm-1, C=C in aromatic compound in the range of 1500-1600 cm-1 ... percentage of Fe in Fe3O4-GOVS is about 48,59% in weight and 18% in atom, which is close to the initial calculation ( 50% in weight and 20 % in atom) After adding to Feo with 10% in weight on...

Ngày tải lên: 28/04/2016, 17:48

... simulation in FE analysis of ring rolling, Journal of Materials Processing Technology, 142, 213-223, 2003 [5] Lianggang Guo, He Yang, Towards a steady forming condition for radial–axial ring rolling, International ... [1] Đào Minh Ngừng, Nguyễn Trọng Giảng, Lý thuyết cán, NXB Giáo dục, 2006 Tạp chí: [2] Hua Lin, Zhao Zhong Zhin, The extremumparameters in ring rolling, Journal of Materials Processing Technology, ... [3] Kluge,Y.-H Lee, H Wiegels, R Kopp, Control of Strain and Temperature Distribution in the Ring Rolling Process, Journal of Materials Processing Technology, 45, 137-141, 1994 [4] M.R Forouzan,...

Ngày tải lên: 08/06/2016, 07:14

... numerical results obtained with those obtained by the introduced formula are included to verify the applicability of the formula Finally, reasonable guidelines to determine the internal design moments, ... no internal moment redistribution by creep deformation of concrete in a span if the structural system maintains the statically determinate structure As shown in Fig 1, the statically indeterminate ... post-tensioning tendons It is thus incorporated into the permanent continuous structure; consequently the internal moment is continuously changed according to the construction sequence and the changing...

Ngày tải lên: 31/10/2016, 20:42

... the Determination of Brain Death in Infants and Children Critical Care Medicine 2011;39:2139–2155 Nakagawa TA, Ashwal SA, Mathur M, Mysore M Guidelines for the Determination of Brain Death in Infants ... has resulted in irreversible coma Coma and apnea must coexist to diagnose brain death Determination of brain death by neurologic examination should be performed in the setting of normal age-appropriate ... remain consistent with brain death All aspects of the clinical examination, including the apnea test, or ancillary studies must be appropriately documented 4 References Guidelines for the Determination...

Ngày tải lên: 14/11/2016, 06:25

... Examination of Water Occurrence of EDTA in river water samples from three regions of Japan was examined EDTA was detected in ten of thirteen river water samples A high level of EDTA was observed in river ... perform an inter-laboratory validation study of the proposed method Determination of EDTA in river water samples For the application of this analytical method to environmental water samples, concentrations ... the other hand, in Shikoku region, EDTA was not observed in the river water samples The concentration of EDTA might be low due to these samples being collected in estuarine regions In further studies,...

Ngày tải lên: 05/09/2013, 10:15

... affect chitin synthesis in the insect cuticle by disrupting the process of connecting the N-acetylglucosamine units to the chitin chain, preventing in this way the normal moulting process of insects ... Chapter Determination of Pesticides in Food of Vegetal Origin Frank J Schenck and Jon W Wong Chapter Determination of Pesticides in Food of Animal Origin Antonia Garrido Frenich, Jose Luis Martinez, ... as lindane, reside in the blockade of the g-aminobutyric acid-gated chlorine channels, inducing convulsions in insects 1.5.2.2 Inhibitors of Cholinesterase The target for many insecticides is an...

Ngày tải lên: 12/08/2014, 04:22

... Deviations (RSD) of Several Triazines Obtained by SPE of L of LC Grade Water Spiked with mg=L of Each Triazine C18 Disk Without NaCl Triazine Desisopropylatrazine Desethylatrazine Simazine Atrazine C18 ... depending on the objective of the analysis Finally, it is important to point out that, in most of the cases, samples need to be stored for certain periods of time before performing the analysis In ... desorption of the analytes in the injector port of the GC instrument is based on the increase of the partition coefficient gas fiber with the increasing temperature In addition, a constant flow of carrier...

Ngày tải lên: 12/08/2014, 04:22

... electrode is minimized or prevented in the presence of free inhibitor (analyte) in solution In this case, the cholinesterase remains in solution bound to the pesticide in the sample The sensing surface ... detected in 8.4% (10 out of 119 samples) of the samples Similar results suggesting that FPBA was detected at much lower rate than 3-PBA in human urine samples collected from residential settings ... advantage over instrumental methods in determining pesticides in this aqueous sample matrix We investigated various sample preparation methods for determining pesticides in baby foods using either...

Ngày tải lên: 12/08/2014, 04:22