The steam-jet aerosol collector (SJAC)

Khlystov, A.; Wyers, G.P.; Brink, H.M. ten; Slanina, J.

doi:10.1016/0021-8502(95)96963-8

Cited by 11 publications

(15 citation statements)

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“…A more general approach has also been used for the automated and in situ sampling of aerosols by absorption into water, using the Particle Into Liquid Sampler (PILS), 117 the Steam Jet Aerosol Collector (SJAC) 118 or the Semi-Continuous Measurement System for Ionic Species (SCMSIS). 119 Particles grown by supersaturated water are impacted on a surface, over which water continuously flows and an ion chromatographer (IC), with a suitable detector, is employed to periodically analyse the collected water sample to give the quantitative soluble ion composition of the aerosol with a high time resolution (minutes).…”

Section: On-line Bulk Sampling and Analysis Methodsmentioning

confidence: 99%

JEM Spotlight: Environmental monitoring of airborne nanoparticles

et al. 2009

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The aim of this work was to review the existing instrumental methods to monitor airborne nanoparticles in different types of indoor and outdoor environments in order to detect their presence and to characterise their properties. Firstly the terminology and definitions used in this field are discussed, which is followed by a review of the methods to measure particle physical characteristics including number, concentration, size distribution and surface area. An extensive discussion is provided on the direct methods for particle elemental composition measurements, as well as on indirect methods providing information on particle volatility and solubility, and thus in turn on volatile and semivolatile compounds of which the particle is composed. A brief summary of broader considerations related to nanoparticle monitoring in different environments concludes the paper.

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Section: On-line Bulk Sampling and Analysis Methodsmentioning

confidence: 99%

JEM Spotlight: Environmental monitoring of airborne nanoparticles

et al. 2009

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“…The design of the AIM-IC sampling unit is based on a modified design of the sampling unit from the GPIC instrument. 37,50 In the AIM 9000D unit on the AIM-IC, gases are collected by a diffusion-based parallel-plate wet denuder (PPWD), 45 and particles are collected in a particle supersaturation chamber (PSSC), a modified design of the steamjet aerosol collector developed by Khlystov et al (1995). 51 A more detailed description of the instrument is provided in Section 2.1.…”

Section: Introductionmentioning

confidence: 99%

“…37,50 In the AIM 9000D unit on the AIM-IC, gases are collected by a diffusion-based parallel-plate wet denuder (PPWD), 45 and particles are collected in a particle supersaturation chamber (PSSC), a modified design of the steamjet aerosol collector developed by Khlystov et al (1995). 51 A more detailed description of the instrument is provided in Section 2.1. AIM-IC can be used to investigate not only temporal variations in the chemical composition of atmospheric fine particulate matter and associated precursor gases, but also important atmospheric processes such as aerosol neutralization and gas/ particle partitioning.…”

Section: Introductionmentioning

confidence: 99%

Characterization and optimization of an online system for the simultaneous measurement of atmospheric water-soluble constituents in the gas and particle phases

2012

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In this work we present the results of extensive characterization and optimization of the Ambient Ion Monitor-Ion Chromatograph (AIM-IC) system, an instrument developed by URG Corp. and Dionex Inc. for simultaneous hourly measurements of the water-soluble chemical composition of atmospheric fine particulate matter (PM(2.5)) and associated precursor gases. The sampling assembly of the AIM-IC consists of an inertial particle size-selection assembly, a parallel-plate wet denuder (PPWD) for the collection of soluble gases, and a particle supersaturation chamber (PSSC) for collection of particles, in series. The analytical assembly of the AIM-IC consists of anion and cation IC units. The system detection limits were determined to be 41 ppt, 5 ppt, and 65 ppt for gas phase NH(3(g)), SO(2(g)), and HNO(3(g)) and 29 ng m(-3), 3 ng m(-3), and 45 ng m(-3) for particle phase NH(4)(+), SO(4)(2-), and NO(3)(-) respectively. From external trace gas calibrations with permeation sources, we determined that the AIM-IC is biased low for NH(3(g)) (11%), SO(2(g)) (19%), and HNO(3(g)) (12%). The collection efficiency of SO(2(g)) was found to strongly depend on the composition of the denuder solution and was found to be the most quantitative with 5 mM H(2)O(2) solution for mixing ratios as high as 107 ppb. Using a cellulose membrane in the PPWD, the system responded to changes in SO(2(g)) and HNO(3(g)) within an hour, however for NH(3(g)), the timescale can be closer to 20 h. With a nylon membrane, the instrument response time for NH(3(g)) was significantly improved, becoming comparable to the responses for SO(2(g)) and HNO(3(g)). Performance of the AIM-IC for collection and analysis of PM(2.5) was evaluated by generating known number concentrations of ammonium sulfate and ammonium nitrate particles (with an aerodynamic diameter of 300 nm) under laboratory conditions and by comparing AIM-IC measurements to measurements from a collocated Aerosol Mass Spectrometer (AMS) during a field-sampling campaign. On average, the AIM-IC and AMS measurements agreed well and captured rapid ambient concentration changes at the same time. In this work we also present a novel inlet configuration and plumbing for the AIM-IC which minimizes sampling inlet losses, reduces peak smearing due to sample carryover, and allows for tower-height sampling from the base of a research tower.

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“…21 The instrument continuously collects ambient aerosol into liquid using a steam-jet aerosol collector (SJAC). 22 The air is sampled at a rate of 16.7 L/min through a PM 2.5 cyclone (URG, Inc.).…”

Section: Hexavalent Chromiummentioning

confidence: 99%

“…The SJAC collects particles down to a few nanometers in diameter (collection efficiency 99%). 22 The collected liquid containing dissolved aerosol species is continuously pumped out and directed to a Long Pathlength Absorption Spectroscopy-Continuous Flow Analysis system (LPAS-CFA), where the concentration of hexavalent chromium is determined using the well established diphenycarbazide (DPC) colorimetric method. 23 The detector uses a liquid core waveguide (LCW) optical cell to increase the sensitivity of the colorimetric method.…”

Section: Hexavalent Chromiummentioning

confidence: 99%

A Method of Assessing Air Toxics Concentrations in Urban Areas Using Mobile Platform Measurements

Isakov

Touma

Khlystov

2007

Journal of the Air & Waste Management Association

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The objective of this paper is to demonstrate an approach to characterize the spatial variability in ambient air concentrations using mobile platform measurements. This approach may be useful for air toxics assessments in Environmental Justice applications, epidemiological studies, and environmental health risk assessments. In this study, we developed and applied a method to characterize air toxics concentrations in urban areas using results of the recently conducted field study in Wilmington, DE. Mobile measurements were collected over a 4-ϫ 4-km area of downtown Wilmington for three components: formaldehyde (representative of volatile organic compounds and also photochemically reactive pollutants), aerosol size distribution (representing fine particulate matter), and water-soluble hexavalent chromium (representative of toxic metals). These measurements were used to construct spatial and temporal distributions of air toxics in the area that show a very strong temporal variability, both diurnally and seasonally. An analysis of spatial variability indicates that all pollutants varied significantly by location, which suggests potential impact of local sources. From the comparison with measurements at the central monitoring site, we conclude that formaldehyde and fine particulates show a positive correlation with temperature, which could also be the reason that photochemically generated formaldehyde and fine particulates over the study area correlate well with the fine particulate matter measured at the central site.

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The steam-jet aerosol collector (SJAC)

Cited by 11 publications

References 0 publications

JEM Spotlight: Environmental monitoring of airborne nanoparticles

JEM Spotlight: Environmental monitoring of airborne nanoparticles

Characterization and optimization of an online system for the simultaneous measurement of atmospheric water-soluble constituents in the gas and particle phases

A Method of Assessing Air Toxics Concentrations in Urban Areas Using Mobile Platform Measurements

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