sample filter Articles
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Deposition of carbon nanotubes in commonly used sample filter media
There is no single standard technique or methodology to characterize the size, structure, number, and chemical composition of airborne carbon nanotubes. Existing analytical instruments and analytical techniques for evaluating nanoparticle concentrations cannot simultaneously provide morphology, state of agglomeration, surface area, mass, size distribution and chemical composition data critical ...
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TA-MS - connecting to TGA and furnace reactors
TGA Interface for PE Pyris 6 / STA 6000 Custom designed hot-zone inlet for the PerkinElmer Pyris 6 TGA or PerkinElmer STA 6000 system. Includes optimised ‘hot-zone’ sampling connection and heated filter assembly. Type 303585 TGA Interface for PE Pyris TGA Custom designed hot-zone inlet for the PerkinElmer Pyris TGA system. Includes optimised ‘hot-zone’ sampling ...
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Mather AFB demonstration of hydrasleeve no-purge samplers
MWHS Americas, Inc. (MWH) was contracted by Dolver Company, Inc. to perform a Point Source Bailer Demonstration at Mather Air Force Base (Mather). This demonstration was initiated to evaluate no-purge technology and indicate the feasibility of using the HydraSleeve no-purge samplers as an alternative groundwater sampling method. On June 18, 2002, eight HydraSleeve point source bailers were ...
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Application of hybrid Kalman filter for improving water level forecast
Numerical modeling is one of the popular means to simulate and forecast the state of oceanographic systems. However, it still suffers from some limitations, e.g., parameter uncertainties, simplification of model assumptions, and absence of data for proper boundary and initial conditions. This paper proposes a hybrid data assimilation scheme, which combines the Kalman filter (KF) with a ...
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Long-term survival of
Escherichia coli in lightweight aggregate filter media of constructed wastewater treatment wetlandsA laboratory scale experiment on the survival of Escherichia coli in samples of filter media from a horizontal subsurface flow constructed wetland treating domestic wastewater was performed. A concentration of E. coli was examined in samples collected from a wetland filter filled with lightweight aggregates (LWA). All samples testing positive for E. coli contamination were used to examine the ...
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Particle counting as a tool to predict filterability in membrane bioreactors activated sludge?
Activated sludge quality is one of the major factors influencing flux decline in membrane bioreactors (MBRs). Sludge filterability is a recognized parameter to characterize the physical properties of activated sludge. Decrease in filterability is linked to a higher number of submicron particles. In our present research we studied whether particle counting techniques can be used to indicate ...
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Lead (Pb) in Workplace Air by Niton 700 Series Field Portable X-Ray Fluorescence (XRF) Analyzer
Procedure: Air samples are collected by drawing workplace air, using personal sampling pumps, through 37-mm mixed cellulose ester (MCE) filters mounted in polystyrene cassettes. Samples are prepared for XRF analyses by transferring each filter, along with the support pad, to a special air filter sample holder, specifically designed for a Niton XRF analyzer. Three separate 60-second readings are ...
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Focus On Microfiltration Part 1: Filter Longevity
For consumers using disk, syringe, and capsule filters it is a common FAQ: How long will my filter last? Or, to put it another way: How much fluid can I expect to pass through my filter before it clogs? This seems to be a simple and reasonable question for a filter consumer: Would any of us purchase a product without an understanding of its service life? However, this apparently simple question ...
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Milwaukee Plant Uses ChemScan Analyzers to Simplify Chloramination Monitoring
Overview Milwaukee Water Works uses ChemScan UV-2150/S Analyzers at two separate plants to monitor and control chloramination process without the need for multiple instruments. Challenge After a widespread outbreak of Cryptosporidium, the Milwaukee Water Works has invested more than a quarter of a billion dollars in water infrastructure and advanced water treatment systems. Part of this process ...
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Removal and transformation of dissolved organic matter (DOM) during the treatment of partially stabilized leachate in membrane bioreactor
The removal of dissolved organic matter (DOM) during municipal solid waste leachate treatment in a membrane bioreactor (MBR) was investigated. The MBR was operated with fouled and cleaned membranes, at a time. DOM, mixed liquor, and effluent were characterized by fractionation and fluorescence excitation–emission matrix (EEM) spectroscopy. Results showed DOM removals of 82% during ...
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‘
Hom ’: a simple point of use water treatment deviceThis study sought to explore a locally assembled ‘Hom’ point of use water treatment device by assessing aspects of its performance and possible effects of using it on compliant households and communities. The conceptual framework highlights poverty and environmental degradation as causes and consequences of one another, with ill-health caused by water-borne diseases reinforcing both to form a ...
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Polyurethane Foam as an Effective Adsorbent for Pesticides in Air (GC Analysis)
Polyurethane foam (PUF) is a lightweight, easy-to-use material for sampling pesticides in air. Low back pressure allows sampling times and representative samples. A PUF filter cartridge designed to attach to the front of an ORBO-1000 PUF sampling cartridge traps aerosols and particulate matter, is easily and conveniently assembled, and can be removed from the ORBO-1000 cartridge and capped ...
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Development of exobiopolymer-based biosensor for detection of phosphate in water
The present study was conducted to develop a biosensor by exploiting phosphate-binding capacity of exobiopolymer (EBP) produced by Acinetobacter sp. An environmental isolate of EBP-producing Acinetobacter sp. was subjected to transposon (Tn5) mutagenesis to overproduce EBP and afford improved phosphate selectivity. A mutant producing the highest amount of EBP with high phosphate-binding ...
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Critique of “Precipitation in Light Extinction Reconstruction” by P.A. Ryan
Untitled Document The goal of the Regional Haze Rule (RHR) is to return visibility in class I areas (CIAs) to natural levels, excluding weather-related events, by 2064. Whereas visibility, the seeing of scenic vistas, is a near instantaneous and sightpath- dependent phenomenon, reasonable progress toward the RHR goal is assessed by tracking the incremental ...
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Removal of Giardia spp. and Cryptosporidium spp. from water supply with high turbidity: analytical challenges and perspectives
Giardia and Cryptosporidium species are a serious problem if present in water supplies. The removal of these protozoans and the adaptation of existing protocols are essential for supplying drinking water to developing countries. Considering this, the aim of this study is to evaluate, on a bench level, the removal of Giardia spp. cysts and of Cryptosporidium spp. oocysts from water with ...
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No Need for Redundant Systems
How many gas monitoring systems does it take to measure a gas concentration? Strangely enough, the answer is not always one.Gas concentration monitoring is not always an easy task. In the ideal world, a monitoring system needs no maintenance, it is infinitely fail-safe, and it operates impeccable irrespectively of the conditions of the gas.However, then reality hits the system with more or less ...
By OPSIS AB
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Biodegradable organic matter in domestic wastewaters: comparison of selected fractionation techniques
The first objective of this work was to evaluate the ability of the long-term BOD tests to provide the total biodegradable COD (BCOD) for domestic wastewaters. Results show that the method is repeatable (using two different volume samples, 97 and 164 mL) and that the fractions of BCOD determined were not statistically different from the one obtained by respirometry (at low S/X ratio). ...
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Petersburg airport improvements - Case Study
Semi-Passive Treatment with ChitoVan Chitosan Lactate Cartridges Dungeness Environmental was called upon to assist with passive treatment using ChitoVan Chitosan Lactate Cartridges at an Airport Safety Improvement project in Petersburg, Ak in March of 2009. The project consisted of expanding the runway to meet FAA and RSA design standards. In the process multiple culverts were replaced which ...
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Nutrient analysis system keeps wastewater plant in control - Case Study
Problem The Denver, Colo., Metro Wastewater Reclamation District wanted near real-time nutrient analysis for a very challenging headworks wastewater aeration process, consisting of a combination of centrate and RAS. The centrate and RAS reaeration basin (CaRRB) effluent is added to primary effluent prior to mainstream aeration. Solution ASA Analytics supplied a centralized nutrient analysis ...
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Detection of Airborne Viruses in a Pediatrics Department Measured Using Real-Time qPCR Coupled to an Air-Sampling Filter Method
Children are vulnerable to viral infections. The study discussed in this article investigates the possibility of aerosol transmission of viruses in children under age 18 in the pediatrics department of a medical center in Taipei, Taiwan. After first using the filtration method to collect viral aerosols, the authors combined it with real-time quantitative polymerase chain reaction (qPCR) to detect ...
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