particle size distribution Articles - page 11

Can protective garments be wearable filters?

Protective garments for medical, civilian safety and military applications range from disposable lightweight fabrics to multilayered fabrics and laminated barrier materials, depending upon the nature of the contamination that threatens the wearer. Usually, only full barrier garments, such as the Level A liquid splash protective garments provide full protection from aerosols, and this is due to ...

Jul. 28, 2011

By American Filtration & Separations Society (AFS)

Differentiation of Mass and Flow Limited Rainfall-Runoff Events for Overland Flow from Small Urban Catchments

ABSTRACTWater quantity and quality are coupled phenomena in urban rainfall-runoff. These rainfall-runoff quantity and quality relationships have been significantly altered by the built environment and associated anthropogenic activities. Understanding the relationship between quantity and quality of urban overland flow for a given catchment facilitates development of in-situ wet weather control. ...

Oct. 22, 2006

By Water Environment Federation (WEF)

New laser-based dust emission monitoring system

Abstract A new generation of continuous particulate matter concentration monitoring instruments is presented, covering a measuring range of 0 to 1000 mg/m3. The laser-based scattered light instrument gives an improved stability as well as excellent resolution in the low range. This enables high concentration measurement as well as especially low emission monitoring down to 0.01 mg/m3 with a ...

May 23, 2007

By SIGRIST - PHOTOMETER AG

Particle-size fractions-dependent extracellular enzyme activity in sediments and implications for resource allocation in a subtropical mangrove ecosys

The distribution of extracellular enzyme activities in particle-size fractions of sediments was investigated in a subtropical mangrove ecosystem. Five enzymes involved in carbon (C), nitrogen (N), and phosphorus (P) cycling were analyzed in the sand, silt, and clay of sediments. Among these fractions, the highest activities of phenol oxidase (PHO), β-D glucosidase (GLU), and ...

Jan. 1, 2015

By GJESM Journal

Atmospheric aerosols behaviour at an industrial area in Northern France

Aerosols samplings by bulk filtration and by use of a high volume cascade impactor were performed taking into account wind directions simultaneously at an urban and a rural site in Northern France. Fifteen major and trace species were considered to study characteristics of the particles collected. Evolution of the Weighted Mean Diameter vs. the wind direction, profiles of the Mass Size Function ...

Sep. 24, 2009

By Inderscience Publishers

Vibrating feeders for stockpiling and reclaim

The expanding applications of vibratory feeders for controlling the flow of bulk materials, and their adaptation for processing requirements, have developed considerable interest in stockpiling and reclaim systems. The general design of these units consists of a material transporting trough, or platform, driven by a vibratory force system. The flexibility and variety of designs is limited only by ...

Aug. 22, 2011

By General Kinematics

Impact of sound attenuation by suspended sediment on ADCP backscatter calibrations

Abstract. Although designed for velocity measurements, acoustic Doppler current profilers (ADCPs) are widely being used to monitor suspended particulate matter in rivers and in marine environments. To quantify mass concentrations of suspended matter, ADCP backscatter is generally calibrated with in situ measurements. ADCP backscatter calibrations are often highly site-specific and season ...

Jul. 30, 2012

By Teledyne RD Instruments

Limited impact of sulfate-driven chemistry on black carbon aerosol aging in power plant plumes

Abstract: The aging of refractory black carbon (rBC) aerosol by sulfate-driven chemistry has been constrained in coal-fired power-plant plumes using the NOAA WP-3D research aircraft during the Southern Nexus (SENEX) study, which took place in the Southeastern US in June and July of 2013. A Single Particle Soot Photometer (SP2) determined the microphysical properties of rBC-containing particles ...

Jun. 25, 2018

By Droplet Measurement Technologies (DMT)

Machine learning for improved data analysis of biological aerosol using the WIBS

Abstract. Primary biological aerosol including bacteria, fungal spores and pollen have important implications for public health and the environment. Such particles may have different concentrations of chemical fluorophores and will respond differently in the presence of ultraviolet light, potentially allowing for different types of biological aerosol to be discriminated. Development of ...

Nov. 19, 2018

By Droplet Measurement Technologies (DMT)

Checklist for making XRF pellets | Spectroscopy Guides

Sample preparation for XRF pellets The process of pressing sample pellets suitable for XRF spectroscopic measurement covers milling/grinding your sample to a suitable fineness, mixing the powdered sample with x-ray powder or similar binder, inserting the mixture into a pellet die and finally compressing the die at pressures between 15 and 40 tons. For the most consistently pressed XRF pellet, ...

Jun. 9, 2017

By Specac Limited

The Clog Blog

Clogging and over pressuring are definitely problematic for Liquid Chromatography columns. Back in 2005 John Dolan’s sage advice to chromatographers to make an LC column last forever was simple, “Never open the box!” As John pointed out, this is not practical and I have to agree. But as an LC column manufacturer I have seen remarks from customers regarding clogging as though it ...

Feb. 7, 2017

By Restek Corporation

Surfactant-assisted oil-in-water monitoring

A variety of common surfactants have been used to reduce fouling and enhance the performance of fluorescence-based oil-in-water monitors. Among the most effective are the alcohol ethoxylates with HLB values close to 12. Examples are SurfonicTM L24-9 (Hunstman, USA, HLB 13) and TergitolTM 15-S-7 (HLB 12.1). These surfactants readily convert heterogeneous oil/water mixtures into homogeneous, ...

Apr. 10, 2008

By Turner Designs Hydrocarbon Instruments, Inc.

Working Principles of Air Monitoring: Light Scattering; Electrochemical, NDIR, PID

Oizom has years of experience in stimulating innovation by creating groundbreaking technology for environmental monitoring. With an IoT-based development approach, Oizom has been able to successfully unlock multiple solutions, catering to various industries. Our sensing technology works on proven working principles like NDIR, Electrochemical Analysis, Semiconductor, Optical Measurement, and ...

Jan. 1, 1900

By Oizom Instruments Pvt. Ltd.

Case Study: Dust Monitoring for Air Purification Using Dustroid

Heavy welding, metal cutting, and buffing activities inside the JCB manufacturing plant of India generate high amounts of Particulate Matters of 2.5 microns (PM2.5) & 10 microns(PM10) (exceeding 300 ug/m3). The situation demanded air quality monitoring and suppression of pollutants. Oizom deployed Dustroid to monitor real-time dust particle generation within the facility. Dustroid solution ...

May 28, 2020

By Oizom Instruments Pvt. Ltd.

Flow-induced errors in airborne in situ measurements of aerosols and clouds

Abstract. Aerosols and clouds affect atmospheric radiative processes and climate in many complex ways and still pose the largest uncertainty in current estimates of the Earth’s changing energy budget. Airborne in situ sensors such as the Cloud, Aerosol, and Precipitation Spectrometer (CAPS) or other optical spectrometers and optical array probes provide detailed information about the ...

Apr. 17, 2020

By Droplet Measurement Technologies (DMT)

$Cloud droplet activation properties and scavenged fraction of black carbon in liquid-phase clouds at the high-alpine research station Jungfraujoch (3580ma.s.l.)$

Cloud droplet activation properties and scavenged fraction of black carbon in liquid-phase clouds at the high-alpine research station Jungfraujoch (3580ma.s.l.)

Abstract. Liquid clouds form by condensation of water vapour on aerosol particles in the atmosphere. Even black carbon (BC) particles, which are known to be slightly hygroscopic, have been shown to readily form cloud droplets once they have acquired water-soluble coatings by atmospheric aging processes. Accurately simulating the life cycle of BC in the atmosphere, which strongly depends on the ...

Mar. 25, 2019

By Droplet Measurement Technologies (DMT)

Evaluation of airborne heavy metal pollution from European sources

An improved MSC-East model for the evaluation of the atmospheric concentration and deposition of heavy metals in Europe and adjoining regions is described. At present, modelling of lead, zinc, arsenic, cadmium and mercury concentrations is carried out within the EMEP grid. At the same time, MSC East performs model calculations within the whole northern hemisphere to the north of 20°N. Each ...

Sep. 17, 2009

By Inderscience Publishers

Different technology options for monitoring oil in produced water – inline continuous monitoring and IR analysis

No offshore facility wants to be caught with a sheen around their platform as that can result in a costly fine for exceeding discharge permit limits for oil. Onboard oil in water analyzers are necessary to ensure the oil/water separation systems are functioning properly before overboard disposal of the produced water. Bench top analyzers have traditionally been used to test oil in water although ...

Apr. 22, 2014

By AMETEK Spectro Scientific

Comparing Field Portable X-Ray Fluorescence (XRF) To Laboratory Analysis Of Heavy Metals In Soil

ABSTRACT Field portable x-ray fluorescence (XRF) continues to gain acceptance as a complement to traditional laboratory testing of metal contaminated soil. The quality of data produced by field XRF varies with site conditions, soil composition, and sample preparation. Quality assurance protocols for the field method usually require that a number of field samples be split and sent to a ...

By Thermo Scientific Niton Analyzers

Sample Handling Strategies for Accurate Lead-In-Soil Measurements in the Field and Laboratory

ABSTRACT The inhomogenous lead-in-soil matrix can present serious obstacles to accurate sample collection and handling. In typical lead-in-soil measurement, particle size related errors in sampling and sample handling often exceed all other sources of error. The magnitude of error can vary widely depending on the particulate nature of the lead contaminant and the effectiveness of control ...

Jan. 29, 1999

By Thermo Scientific Niton Analyzers

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