analysis of organic matter analysis in environmental examples

... within the interstices of the filter bed media which provided increased adsorption surfaces and mechanical straining as well Organic matter causes chemical leaching of arsenic in AIRU The leaching ... within the accumulated sludge in the filter bed and hence would cause the bioleaching of arsenic Thus, the bioleaching of arsenic, in the presence of organic matter, was observed under the inoperative ... kept inoperative for a few days The microbial decomposition of organic matter would most likely happen in the inoperative condition of the AIRU In the biodegradation process of organic matter, ...

Ngày tải lên: 05/09/2013, 09:38

... consists of a set of evaluative criteria, set of weights indicating the importance of those criteria, a set of alternatives, and a set of performance measures indicating the performance of each ... 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 ... educational background in civil engineering/ water resources Prof Mohamed Nor’s major field in hydrology/ urban drainage Professor Mohamad Nor has earned his PhD in civil engineering from Lund University,...

Ngày tải lên: 05/09/2013, 16:11

... activity The incorporation of logging residues into the mineral soil implied higher rates of soil biological processes, which resulted in increased organic matter decomposition and in changes of N dynamics ... immobilized in the mineral soil [43] or in organic residues [21] These factors determine the availability of N to plants and export of N in both the short and long term In Northern Spain, commercial ... caused by increased decomposition and mineralization of organic matter resulting from the higher temperature and moisture content of soils following harvesting There is at present a need for information...

Ngày tải lên: 08/08/2014, 14:21

... 1 Introduction Materials and methods Quality of organic matter is of prime importance for the majority of the functional processes occurring in the soil of forest ecosystems ... occurs yearly during certain periods, depending on the phenology of the dominant species The production of litter is intimately related to the edaphoclimatic factors of the zones in such a way that ... encompass organic matter dynamics in a comparison to that occurring in on beech forest a stand planted on terrain suitable for beech period of experimentation over a within climax pine 3-year...

Ngày tải lên: 08/08/2014, 14:21

... behind better preservation of organic matter due to high sedimentation rate is that the organic matter will have a shorter residence time in the water column (where remineralization of organic matter ... (1994) plot for differentiating sources of organic matter …………………………………………… 61 Discrimination of sewage contaminated sediments from uncontaminated sediments using the plot of %Corg versus C/N ratio ... sewage has been disposed into the Harbour Release of methane from harbour sediments during dredging activities instigated interest in studying the sources of methane trapped in Victoria Harbour sediments...

Ngày tải lên: 14/11/2014, 07:29

... ecosystems in most parts of the world Research in this area is beginning to gain some importance on the American continent, and has been receiving attention in Europe It is an area that requires investigation ... of “green” chemicals in the future Sources and Input of Organic Pollutants to the Environment 2.1 Diffusive versus Point Sources Sources of contaminants to the environment may be classified into ... investigation in the future 2.5 Compounds and Mixtures Although some sources of contaminants emit solely or predominantly one type of compound into the environment, contaminants usually find their way into...

Ngày tải lên: 14/02/2014, 09:20

... function of these various wetland communities In turn, an increased understanding of the intrinsic contaminant transformation processes would help supporting the development of organic contaminant ... when dealing with aged sediments (Lee et al., 2003) Aging results from chemical reactions sequestering contaminants into organic matter, diffusion into very small pores or inclusion of non-aqueous ... remains challenging Indeed, numerous environmental factors and system-inherent processes 359 359 359 359 359 359 inuence organic contaminant removal efciency and may complicate the maintenance of...

Ngày tải lên: 28/03/2014, 19:20

... to the growing plant, and is of much practical importance This will be examined more fully in speaking of manures How is it obtained by the soil? What offices does the organic matter in the soil ... condition of inorganic matter is requisite for fertility? What is the fixed rule with regard to this? What is the condition of the alkalies in most of their combinations? Of the acids? What is said of ... [R]By absorbing and retaining, we mean taking up and holding [S]Nitrates are compounds of nitric acid (which consists of nitrogen and oxygen), and alkaline substances Thus nitrate of potash (saltpetre),...

Ngày tải lên: 29/06/2014, 15:20

... condition of the alkalies in most of their combinations? Of the acids? What is said of phosphate of lime? The more minute ingredients of the soil—those which enter into the construction of plants—exist ... to the growing plant, and is of much practical importance This will be examined more fully in speaking of manures How is it obtained by the soil? What offices does the organic matter in the soil ... growth of plants It is true that, in the case of the decomposition of organic matter in the soil, certain compounds are formed, known under the general names of humus and humic acid, which may, in...

Ngày tải lên: 29/06/2014, 15:20

Ngày tải lên: 14/11/2014, 06:28

... 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

... 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 ... pH-dependent 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) ... 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...

Ngày tải lên: 16/09/2015, 17:13

... follows: 20-ml of methanol, an optimum microwave heating temperature of 80 °C, and a 6-min of microwave heating Table 5-4 Variance analysis table in the OA (27) matrix for the optimization of MAE from ... within 1-2 minutes of microwave heating during the extraction An important point to note when employing the OAD procedure is that although some parameters (duration of extraction and volume of ... 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,...

Ngày tải lên: 16/09/2015, 17:13

... 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 ... 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) ... the recovery of PAHs, 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...

Ngày tải lên: 16/09/2015, 17:13

... degradation rates increase in the order of increasing pH (seawater [pH 7.8] or river water [pH 7.6] > drinking water [pH 7.03] > rain water [pH 4.2]) For example, the percentage of degradation in seawater ... and organic matter possibly enhance degradation of propoxur in sea and river water, Seiber et al reported a remarkable decrease in the halflife of Carbofuran in paddy field water instead of distilled ... 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...

Ngày tải lên: 16/09/2015, 17:13

... Polychlorinated biphenyls (PCB-1242 and PCB-1248) were purchased as individual standard stock solutions containing a nominal concentration of 100 µg/ml in methanol from Ultra-Scientific Atrazine (purity ... 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, acetone, dichloromethane ... lactuca) were purchased in a local market In order to remove possible trace organic contaminants prior to preparation, all of them were washed in fresh running water and then rinsed with deionized...

Ngày tải lên: 16/09/2015, 17:13

... 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 analysis In an APCI ... Table 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) ... 45 pesticides in the range 1–5 ng/l On-line sample processing by means of column switching using 10 ml of sample volume, allowed for the determination of phenylurea herbicides in environmental...

Ngày tải lên: 16/09/2015, 17:13

... 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 - - ... Phatr;CYC-like Diatom-specific cyclins U/P cyclins C/T/H/L cyclins D/G/I cyclins A/B cyclins Arath;SDS Figure Phylogenetic analysis of the cyclins of P tricornutum Neighbor-joining tree (TREECON, Poisson...

Ngày tải lên: 09/08/2014, 20:21

... tip of the syringe needle in a stirred aqueous sample containing the analytes of interest After extraction, the extraction droplet is withdrawn back into the microsyringe and introduced to instrument ... is generally used in combination with GC Since thermal desorption is the main means of removing the analytes from the sorbent for analysis It is employed for analysis of a vast of compounds, especially ... further development and investigation of its applicability in trace organic pollutants analysis of environmental samples are required The main objective of the work presented in this thesis was to...

Ngày tải lên: 09/09/2015, 10:18

... 27] According to the theory of green accounting, finding a decreasing GNNI implies that in the future there will be a decrease in utility Thus, according to the definition of sustainability as ... Engineering, Instituto Superior Técnico, focusing his research on optimization of alternative road vehicles Areas of interest include research in the areas of new technology in road vehicles; analysis ... degree in Mechanical Engineering from the Technical University of Lisbon, Instituto Superior Técnico, Portugal, in 2009 Currently is a PhD student in Mechanical Engineering at Institute of Mechanical...

Ngày tải lên: 09/09/2015, 10:32