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Title: Sampling Artifacts from Conductive Silicone Tubing

Abstract

We report evidence that carbon impregnated conductive silicone tubing used in aerosol sampling systems can introduce two types of experimental artifacts: 1) silicon tubing dynamically absorbs carbon dioxide gas, requiring greater than 5 minutes to reach equilibrium and 2) silicone tubing emits organic contaminants containing siloxane that adsorb onto particles traveling through it and onto downstream quartz fiber filters. The consequence can be substantial for engine exhaust measurements as both artifacts directly impact calculations of particulate mass-based emission indices. The emission of contaminants from the silicone tubing can result in overestimation of organic particle mass concentrations based on real-time aerosol mass spectrometry and the off-line thermal analysis of quartz filters. The adsorption of siloxane contaminants can affect the surface properties of aerosol particles; we observed a marked reduction in the water-affinity of soot particles passed through conductive silicone tubing. These combined observations suggest that the silicone tubing artifacts may have wide consequence for the aerosol community and should, therefore, be used with caution. Gentle heating, physical and chemical properties of the particle carriers, exposure to solvents, and tubing age may influence siloxane uptake. The amount of contamination is expected to increase as the tubing surface area increases and as themore » particle surface area increases. The effect is observed at ambient temperature and enhanced by mild heating (<100 oC). Further evaluation is warranted.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Chemical Sciences Division; Environment, Health& Safety Division; Environmental Energy Technologies Division
OSTI Identifier:
963654
Report Number(s):
LBNL-2150E
TRN: US200918%%62
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Aerosol Science&Technology
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; AEROSOLS; AMBIENT TEMPERATURE; CARBON; CARBON DIOXIDE; CHEMICAL PROPERTIES; CONTAMINATION; HEATING; MASS SPECTROSCOPY; PARTICULATES; QUARTZ; SAMPLING; SILICON; SILICONES; SILOXANES; SOLVENTS; SURFACE AREA; SURFACE PROPERTIES; THERMAL ANALYSIS; Sampling, Artifacts, Tubing, Silicone

Citation Formats

Timko, Michael T., Yu, Zhenhong, Kroll, Jesse, Jayne, John T., Worsnop, Douglas R., Miake-Lye, Richard C., Onasch, Timothy B., Liscinsky, David, Kirchstetter, Thomas W., Destaillats, Hugo, Holder, Amara L., Smith, Jared D., and Wilson, Kevin R. Sampling Artifacts from Conductive Silicone Tubing. United States: N. p., 2009. Web. doi:10.1080/02786820902984811.
Timko, Michael T., Yu, Zhenhong, Kroll, Jesse, Jayne, John T., Worsnop, Douglas R., Miake-Lye, Richard C., Onasch, Timothy B., Liscinsky, David, Kirchstetter, Thomas W., Destaillats, Hugo, Holder, Amara L., Smith, Jared D., & Wilson, Kevin R. Sampling Artifacts from Conductive Silicone Tubing. United States. doi:10.1080/02786820902984811.
Timko, Michael T., Yu, Zhenhong, Kroll, Jesse, Jayne, John T., Worsnop, Douglas R., Miake-Lye, Richard C., Onasch, Timothy B., Liscinsky, David, Kirchstetter, Thomas W., Destaillats, Hugo, Holder, Amara L., Smith, Jared D., and Wilson, Kevin R. Fri . "Sampling Artifacts from Conductive Silicone Tubing". United States. doi:10.1080/02786820902984811. https://www.osti.gov/servlets/purl/963654.
@article{osti_963654,
title = {Sampling Artifacts from Conductive Silicone Tubing},
author = {Timko, Michael T. and Yu, Zhenhong and Kroll, Jesse and Jayne, John T. and Worsnop, Douglas R. and Miake-Lye, Richard C. and Onasch, Timothy B. and Liscinsky, David and Kirchstetter, Thomas W. and Destaillats, Hugo and Holder, Amara L. and Smith, Jared D. and Wilson, Kevin R.},
abstractNote = {We report evidence that carbon impregnated conductive silicone tubing used in aerosol sampling systems can introduce two types of experimental artifacts: 1) silicon tubing dynamically absorbs carbon dioxide gas, requiring greater than 5 minutes to reach equilibrium and 2) silicone tubing emits organic contaminants containing siloxane that adsorb onto particles traveling through it and onto downstream quartz fiber filters. The consequence can be substantial for engine exhaust measurements as both artifacts directly impact calculations of particulate mass-based emission indices. The emission of contaminants from the silicone tubing can result in overestimation of organic particle mass concentrations based on real-time aerosol mass spectrometry and the off-line thermal analysis of quartz filters. The adsorption of siloxane contaminants can affect the surface properties of aerosol particles; we observed a marked reduction in the water-affinity of soot particles passed through conductive silicone tubing. These combined observations suggest that the silicone tubing artifacts may have wide consequence for the aerosol community and should, therefore, be used with caution. Gentle heating, physical and chemical properties of the particle carriers, exposure to solvents, and tubing age may influence siloxane uptake. The amount of contamination is expected to increase as the tubing surface area increases and as the particle surface area increases. The effect is observed at ambient temperature and enhanced by mild heating (<100 oC). Further evaluation is warranted.},
doi = {10.1080/02786820902984811},
journal = {Aerosol Science&Technology},
number = ,
volume = ,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2009},
month = {Fri May 15 00:00:00 EDT 2009}
}