Inhalable Fraction Sampling: Too much of a good thing?
Abstract No:
1266
Abstract Type:
Professional Poster
Authors:
R Agnew1
Institutions:
1Liberty Mutual Insurance Group, Stillwater, OK
Presenter:
Robert Agnew, PhD, CIH, CSP, FAIHA
Liberty Mutual Insurance Group
Description:
The ACGIH TLV Committees have increasingly called for the use of the inhalable fraction for particulate sampling. While these calls are supported by academic evidence, there is a growing body of evidence that the limitations of the Institute of Occupational Medicine (IOM) sampler need to be considered; particularly when inertially driven particles are present. Presented in this poster are real-world results using IOM and Button Aerosol Samplers (BAS, or "button") across several industries with observations from both field and laboratory personnel. In this poster, we will review paired data sets between samplers and between O-ring materials. Through this, we will highlight limitations of these samplers including considerations for triboelectric charge and alternative approaches to results interpretation.
Situation / Problem:
Mega particles and inertially driven particles impart a positive bias to IOM sample results. This work looks at the effects of these biases vs the Button Aerosol Sampler (BAS). Additionally, some particles undergo triboelectric charging (such as wood dust from saw cutting) that may have a negative bias in button samplers due to PTFE O-rings. Therefore, carbon-impregnated O-ring use is investigated.
Methods:
Side-by-side sampling is used to evaluate bias in IOM vs BAS systems and for PTFE vs Carbon-impregnated O-rings. Samples were collected in a variety of industries and examined at our accredited in-house lab.
Results / Conclusions:
IOM results are ~2X of BAS results when inertially driven particles are present
PTFE O-ring results show a about a 20% negative bias vs Carbon-impregnated O-rings when particles have an imparted triboelectric charge
Core Competencies:
Exposure Assessment
Secondary Core Competencies:
Chemical Sampling and Instrumental Analysis
Exposure Assessment
Choose at least one (1), and up to five, (5) keywords from the following list. These selections will optimize your presentation's search results for attendees.
Aerosol and airborne particulate monitoring
Exposure Assessment
Based on the selected primary competency area of your proposal, select one group below that would be best suited to serve as a subject matter expert for peer review:
(Select one)
Aerosol Technology Committee
Based on the information that will be presented during your proposed session, please indicate the targeted audience practice level: (select one)
Practitioner: Practitioner is a job title given to persons in various occupational fields who are trained to assist professionals but are not themselves licensed or certified at a professional level by a certification body recognized by the National Accreditation Recognition (NAR) Committee of IOHA. The IH/OH practitioner performs tasks requiring significant knowledge and skill in the IH/OH field, such as conducting worker exposure monitoring and, in some cases, may even function independently of a professional IH/OH but may not be involved in the breadth of IH/OH practice nor have the level of responsibility of a professional IH/OH certified by examination.
The IH/OH practitioner requires a certain level of education that can be obtained from an accredited university or equivalent. Additional training in specific skill sets that provide additional career paths to the IH/OH practitioner can also be obtained. IH/OH practitioners may also serve as team leaders or project managers.
Was this session organized by an AIHA Technical Committee, Special Interest Group, Working Group, Advisory Group or other AIHA project Team?
No
Are worker exposure data and/or results of worker exposure data analysis presented?
Yes
If yes, i.e., If worker exposure data and/or results of worker exposure data analysis are to be presented please describe the statistical methods and tools (e.g. IHSTAT, Expostats, IHSTAT_Bayes, IHDA-AIHA, or other statistical tool, please specify) used for analysis of the data.
Paired data, not population data, difference in means tests
How will this help advance the science of IH/OH?
Gain a better understanding of the use and limitations of Inhalable fraction size selective sampling devices
What level would you consider your presentation content geared towards?
Intermediate: Specific topics within a subject. The participant would have two (2) to ten (10) years experience in industrial hygiene or OEHS and a good understanding of the subject area, but not of the specific topic presented. Prerequisites required: another course, skill, or working knowledge of the general subject.
Have you presented this information before?
No
I have read and agree to these guidelines.
Yes
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