Particle Analysis Articles on Environmental XPRT

Particle Dispersion for Size Analysis

Panicle size analysis is a vital analytical tool in the pharmaceutical industry. The results can be used to meet safety and quality specifications and provide information for product development and manufacturing. Modern techniques have made determining the particle size of a material quick and convenient, but many factors can influence the quality of data obtained. While particle size analysis ...

Jul. 2, 2013

By Particle Technology Labs

Automating oil particle analysis

Run up to 25 samples at one time The major issue for premature failure in wind turbine gearboxes is bearing failure, which leads to gearbox failure. A wind turbine gearbox will not survive if the oil is ...

Dec. 2, 2016

By Spectro Scientific

Single-particle analysis and electron tomography

Both single-particle analysis and electron tomography are special tools for the structural analysis of biological components by transmission electron microscopy. Single-particle analysis enables us to determine the structures of relatively large proteins and macromolecular complexes without crystallisation. Electron tomography is often used to visualise organelles and subcellular structures at ...

Oct. 23, 2006

By Inderscience Publishers

Guide to Measuring Particles in Oil

Particle counting is a critical aspect of any machine conditioning program and there are many tools out there available to monitor and track the quantity and severity of the contamination, be it due to external contamination or machine wear. The ...

May 3, 2016

By Spectro Scientific

Particle shape factors and their use in image analysis part II: practical applications

Abstract The first installment of this two-part discussion concluded by stating a single linear measurement (i.e.. circular equivalent diameter) may not be adequate to describe a tj^ical non-spherical particle with some degree of surface roughness. There are various definitions and several standardized shape factors available that can provide additional descriptors to a particle ...

Jul. 2, 2013

By Particle Technology Labs

One-step analysis of bubble-particle capture interaction in dissolved-air flotation

The capture of particles by air microbubbles in dissolved air flotation has been analysed using a one-step (holistic) approach, which numerically solved the motion equation (with the inclusion of microhydrodynamic resistance functions and surface forces) for both the bubble-particle collision and attachment interactions. Model predictions with the inclusion of non-DLVO attractive surface force ...

Jul. 27, 2007

By Inderscience Publishers

Oil-In-Water Analysis. Verification of Particle Counter results by optical microscopy

For my research work, which concerns separation of liquid/liquid dispersions, I selected the Spectrex PC2200. It covers the whole range of droplet sizes which are of interest, i.e. from 0.5 to 100 microns. The procedure for analysis is very simple and results are obtained in less than a minute. This makes the Spectrex instrument very handy for use in the lab as well as for field measurements (A ...

Oct. 3, 2011

By Spectrex Corporation

Rapid HPLC Analysis of PAH Compounds, Using Porous 3µm Particles

Polynuclear aromatic hydrocarbons (PAHs) are a severe environmental hazard with a variety of sources. Airborne particles, combustion products, and fossil fuels all contain these toxic aromatic substances. Analysis by gas chromatography (GC) has been problematic because GC phases do not meet the need for shape selectivity in separating PAHs. Conversely, high-density C18 octadecylsilane (ODS) ...

Dec. 31, 1997

By MilliporeSigma

Particle shape factors and their use in image analysis - part 1

Fine panicles are often characterized by their particle size and distribution as determined by various analytical instruments. Particle shape may be just as important as particle size. Particle shape, however, is often ignored or disregarded. Image analysis is a technique capable of measuring particle shape factors and providing valuable information. These shape factors may dictate the behavior ...

Jul. 2, 2013

By Particle Technology Labs

Automated Oil Particle Analysis Helps Prevent Gearbox Failures

The major issue for premature failure in wind turbine gearboxes is bearing failure, which leads to gearbox failure. A wind turbine gearbox will not survive if the oil is not clean and especially if the hard ferrous particles are not removed from ...

Dec. 23, 2016

By Spectro Scientific

European On-Line Particle Mass Spectrometry

An international workshop on European On-line Particle Mass Spectrometry (PMS) was held 29th-30th of November 2005 at the JRC in Ispra, Italy. The main goals of the Workshop were: 1) To get together all European scientists involved in the field of PMS 2) To review the latest scientific progress on the field of PMS, with particular emphasis on:a. New instrumentationsb. Data analysisc. ...

Jan. 1, 2006

A Comparison of Methods to Determine the Particle Size

There currently exist a multitude of techniques to determine particle size distributions. However, in assessing the particle size distribution (PSD) of solids in a stormwater sample, the number of suitable techniques is considerably reduced due to the limited quantity of solids in a typical stormwater sample. The electrical sensing zone method (ESZ), which utilizes the Coulter Principle, and ...

Jul. 25, 2006

Influence of particle size on bacterial community structure in aquatic sediments as revealed by 16s rrna gene sequence analysis

Bacterial communities associated with sediment particles were examined using PCR-denaturing gradient gel electrophoresis and 16S rRNA gene sequencing. Particle size influenced community structure, with attached bacterial assemblages separating into 63- to 125-, 125- to 1,000-, and 1,000- to 2,000-µm fractions. Differences were particularly ...

Aug. 1, 2008

By American Society for Microbiology

An analysis of extinction coefficients of particles and water moisture in the stack after flue gas desulfurization at a coal-fired power plant

Two important factors that affect in-stack opacity—light extinction by emitted particles and that by water moisture after a flue gas desulfurization (FGD) unit—are investigated. The mass light extinction coefficients for particles and water moisture, kp and kw, respectively, were determined using the Lambert-Beer law of opacity with a nonlinear least-squares regression method. The ...

Aug. 1, 2011

By Air & Waste Management Association (A&WMA)

Using sediment particle size class analysis to better understand urban land-use effects

Abstract A nested-scale experimental watershed study design was used to demonstrate rainfall-runoff and sediment particle size class variability in a representative urbanizing watershed in central Missouri USA. On average, sediment particle size classes were almost twice as large (2.0 to 500um size range) in headwaters, relative to an urban setting. Eighty percent of total sediment in ...

Oct. 20, 2015

By Sequoia Scientific, Inc.

Comprehensive understanding of nano-sized particle separation processes using nanoparticle tracking analysis

The understanding of nano-sized particle separation processes has been limited by difficulties of nanoparticle characterization. In this study, nanoparticle tracking analysis (NTA) was deployed to evaluate the absolute particle size distributions in laboratory scale flocculation and filtration experiments with silver nanoparticles. The results from NTA were consistent with standard theories of ...

Sep. 4, 2015

By IWA Publishing

Observation based analysis for the determination of equilibrium time constant between ammonia, acid gases, and fine particles

Experimental measurements of ammonia, acid gases, and the inorganic components of atmospheric aerosols were made at a commercial hog farm in eastern North Carolina from May 1998 to June 1999 by an annular denuder system (ADS). The ADS consisted of a cyclone separator, one diffusion denuder coated with sodium carbonate, another diffusion denuder with citric acid, and a filter pack containing ...

Apr. 21, 2005

By Inderscience Publishers

$Problems in Particle Size: Laser Diffraction Observations$

Problems in Particle Size: Laser Diffraction Observations

The results obtained by a particle size analysis can easily be taken for granted. If the particle size distribution of a material must be quantified and reported, it is important that the full implications of the analytical technique and generated data are investigated and understood. While complying with designated testing methods and procedures is of great importance in a quality assurance ...

Jul. 2, 2013

By Particle Technology Labs

Dyed viruses and metal particles for advanced separation studies

Single nanometer sized particles are poorly retained by conventional water treatment methods and are hardly detectable in water samples. The particles present a separate class of pollutants and their transport and fate cannot be studied by tracking bacteria, turbidity, free dyes or ions. Dyed bacteriophages and gold nanoparticles are two novel tools that facilitate the studies of virus ...

Jul. 30, 2014

By IWA Publishing

The Residence Time of Settling Particles in the Surface Mixed Layer

Abstract The transport from the upper mixed layer into the pycnocline of particles with negative buoyancy is considered. Assuming the hydrodynamic parameters to be time- independent, an adjoint model is resorted to that provides a general expression of the residence time in the mixed layer of the constituent under study. It is seen that the residence time decreases as the settling velocity ...

Jan. 17, 2006

By Springer

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