semipermeable membrane devices spmd for passive sampling

... the use of semipermeable membrane devices for monitoring environmental contaminants: Journal of Chromatography A, v 879, p. 83-95 4   Water-Quality Data from Semipermeable- Membrane Devices and ... conventional water -sampling techniques In addition, many compounds of interest may be present only during episodic events Two types of passive samplers—the semipermeable membrane device (SPMD) and the ... sampler Performance reference compound Quality control Relative standard deviation Size exclusion chromatography Semipermeable membrane device U.S Geological Survey Water-Quality Data from Semipermeable- Membrane...

Ngày tải lên: 14/03/2014, 20:20

... 17.5 Semipermeable membrane devices for passive sampling in sediment pore-water 17.6 Solid-phase microextraction devices for passive sampling in soil and sediment ... Low-capacity sampling: polymer-coated glass 2.4.2 Medium-capacity sampling devices: polyurethane foam disks 2.4.3 High-capacity sampling devices: semipermeable membrane ... covering air sampling, water sampling, soil/sediment, biomonitoring and bioassays The major passive sampling devices used for air and water are described in detail, such as the semi-permeable membrane...

Ngày tải lên: 28/03/2014, 18:20

... anchor for site-directed fibril assembly Precedence for this mechanism of amyloid formation has been Fig Negative stain electron microscopy of a-synuclein in the presence of synaptosomal membranes ... lysosomal and Golgi membranes in this preparation Our experiments address only synaptosomal membrane interactions and therefore represent a small population within the whole cell membrane preparation ... not form fibrils When incubated in the presence of synaptosomal membranes (B) abundant a-synuclein fibrils could be detected with organization along the vesicle surface A53T mutant a-synuclein formed...

Ngày tải lên: 30/03/2014, 15:20

... 17.5 Semipermeable membrane devices for passive sampling in sediment pore-water 17.6 Solid-phase microextraction devices for passive sampling in soil and sediment ... Low-capacity sampling: polymer-coated glass 2.4.2 Medium-capacity sampling devices: polyurethane foam disks 2.4.3 High-capacity sampling devices: semipermeable membrane ... covering air sampling, water sampling, soil/sediment, biomonitoring and bioassays The major passive sampling devices used for air and water are described in detail, such as the semi-permeable membrane...

Ngày tải lên: 28/06/2014, 00:20

... drugs for months, before presenting with a further relapse A more intensive treatment was performed (Figure 1) with cyclophosphamide 10mg/kg/ day for 10 days and methylprednisolone 40mg/kg/day for ... intensive care unit; (B) before extracorporeal membrane oxygenation with evidence of pneumomediastinum (white arrow), in spite of protective ventilatory strategy; (C) before intensive care unit ... (B) connection to extracorporeal membrane oxygenation; (C) disconnection from extracorporeal membrane oxygenation The black arrow indicates the first positivity for Aspergillus galactomannan antigen...

Ngày tải lên: 11/08/2014, 17:21

... Low-capacity sampling: polymer-coated glass 2.4.2 Medium-capacity sampling devices: polyurethane foam disks 2.4.3 High-capacity sampling devices: semipermeable membrane ... covering air sampling, water sampling, soil/sediment, biomonitoring and bioassays The major passive sampling devices used for air and water are described in detail, such as the semi-permeable membrane ... solid-phase microextraction devices (SPMD or SPME, respectively) The book also addresses the issues of biomimetic sampling devices and the combination of bioassays with passive samples, a very useful...

Ngày tải lên: 12/08/2014, 16:21

... especially for multi-point sampling over large, remote areas [2] The only disadvantage of permeation passive samplers seems to be relatively low sampling rates, which requires long sampling times ... and an inner fluid [3] Independently from the devices designed for passive sampling in water (described in Chapter 10 of this book) two types of MESCOs for the long-term monitoring of semi-volatile ... concentrations and the necessity to calibrate passive samplers for each substance due to distinguishing membrane characteristics [4] However, long sampling times at low concentrations can also...

Ngày tải lên: 12/08/2014, 16:21

... Survey POCIS from Site were lost during deployment b Acetaminophen recovery from the fortified POCIS matrix performed at n ¼ c Only one replicate from each survey was analyzed D.A Alvarez et al ... chemicals, and their degradation products) into aquatic systems on a world-wide basis may be responsible for incidents of acute toxicity and sublethal chronic abnormalities [1–3] These adverse effects ... are of particular concern because they are designed to elicit diverse pharmacological responses Unfortunately, $ Although the research described in this chapter has been funded in part by the United...

Ngày tải lên: 12/08/2014, 16:21

... sampling methods that provide only an instantaneous estimate of the concentration of pollutants at the time and point of sampling Amongst these alternative technologies are passive sampling devices ... diffusion membrane to separate a receiving phase (with a high affinity for the pollutants to be monitored) from the aqueous environment Over the last decade, a range of low-cost passive sampling devices, ... The performance of the sampling devices for the various groups of target analytes was optimised by an appropriate selection of combinations of various sorbent receiving phases and polymeric membranes...

Ngày tải lên: 12/08/2014, 16:21

... within a layer of hydrogel and outer filter membrane The filter membrane is exposed directly to the deployment solution and acts as a protective layer for the diffusive gel Once diffusing through ... in the mid-1990s as an in situ technique for dynamic trace metal speciation measurements [1,2] It has since been developed as a general monitoring tool for a wide range of analytes in addition ... 238 TABLE 10.2 Sampling rates (RS) of different MESCO II configurations (SR—silicone rod; ST––silicone tube) for selected priority pollutants determined in various...

Ngày tải lên: 12/08/2014, 16:21

... entire sampling time Based on this, the ceramic dosimeter allows for quantification of chemical concentrations over extended periods, without the need for calibration or frequent snapshot sampling ... into sorption devices and equilibrium DSs Sorptive devices are discussed briefly in the following paragraph; however, this chapter concentrates on equilibrium DSs Sorption devices for measuring ... DSs can be advantageous for sampling VOCs in ground-water primarily because they have the potential to reduce costs substantially compared with pumping approaches to well sampling The depth-specific...

Ngày tải lên: 12/08/2014, 16:21

... considerations in the use of passive sampling devices in water monitoring Per-Anders Bergqvist and Audrone Zaliauskiene 14.1 INTRODUCTION Semipermeable membrane devices (SPMDs) are passive monitors that ... interpretation of SPMD results? What quality control (QC) measures are needed for SPMD sampling? Are SPMD calibration data available for the compounds of interest? What constitutes good SPMD practice ... compartments Biomimetic extraction for toxicity assessment of aqueous contaminants 316 Chapter 15 Techniques for quantitatively evaluating aquatic passive sampling devices B Scott Stephens and Jochen...

Ngày tải lên: 12/08/2014, 16:21

... g 150–400 [52] 400 [41] [50] 343 Techniques for quantitatively evaluating aquatic passive sampling devices Milli-Q and seawater Location Type Sites Passive samplesa Grab samplesa Exposure duration ... [66] [16] [17] [33] Techniques for quantitatively evaluating aquatic passive sampling devices TABLE 15.5 Some simultaneous passive and grab field validations Chapter 16 Theory and applications ... periods and sampling regimes Entailed two field exposures Grab samples were composited for second Only single water samples taken at each of five sites [65] [66] [16] [17] [33] Techniques for quantitatively...

Ngày tải lên: 12/08/2014, 16:21

Ngày tải lên: 12/08/2014, 16:21

Ngày tải lên: 14/11/2014, 08:54

Ngày tải lên: 14/11/2014, 12:28

... Nanochannels within alumina membrane Receiver Feed Membrane electrodes Membrane electrode at receiver face Fig 2.2 Schematic of membrane electrodes cell and detail of membrane electrode at receiver ... 39 away from the membranes [7, 14] Herein, anodic nanoporous alumina membrane (Whatman) was employed as the separation membrane Our approach involves constructing an electrode -membrane- electrode ... et al have reported the use of transmembrane potentials to produce the driving force for electrophoretic separation of proteins across gold-plated nanotube membranes, using an externally applied...

Ngày tải lên: 11/09/2015, 09:56

... bilayer lipid membrane that can act as cell membranes [4, 5] The first artificial lipid membrane system was developed by Mueller et al in 1960s [6], and was termed as black lipid membrane, which ... groups also employed transmembrane potentials to produce driving forces for both flux and electrophoresis selectivity of proteins across the gold-coated nanotube transmembrane based on their differences ... was high The nanoporous alumina membranes, a type of ceramic membranes, have been used to study the transport of analytes through membranes One advantage of alumina membrane is its controllable...

Ngày tải lên: 11/09/2015, 09:56

... Nanoporous membrane based biosensors Nanoporous membranes, comprising uniform and regularly spaced channels of nanometer dimension, have attracted great interest as a template material for the incorporation ... M NaCl 118 4.3.3 Effect of membrane porous structure To optimize the membrane porous structure for the sensing of WNV-III, different biosensors were prepared from membrane electrodes etched in ... fitted values for different biosensors give K = (6.4 ± 1)×1011 M-1 and θmax = 1.1 ± 0.1 for WNV-DIII and K = (4.3 ± 0.7)×1016 M-1 and θmax = 0.6 ± 0.0 for WNV particle (Table 4.1) θmax for WNV-DIII...

Ngày tải lên: 11/09/2015, 09:56

... membranes with 200 nm nominal pore size were obtained from Whatman (Maidstone, Kent, UK) All membranes were washed with hydrogen peroxide (Scharlau) before use Subsequently, one side of the membrane ... alumina membrane are not conductive enough, therefore before SEM analyses they were coated with a thin layer of platinum deposited by sputtering method 5.3.3 Development of PB nanotube membrane ... nanorods/nanowires were formed; the PB nanotube-modified membrane electrode remains permeable to water Fig 5.3 Scanning electron micrograph of nanoporous alumina membrane template (A) before and (B) after...

Ngày tải lên: 11/09/2015, 09:57