Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
4730996
Reference Type
Journal Article
Title
Influence of airborne particulates on respiratory tract deposition of inhaled toluene and naphthalene in the rat
Author(s)
Roberts, SM; Rohr, AC; Mikheev, VB; Munson, J; Sabo-Attwood, T
Year
2018
Is Peer Reviewed?
Yes
Journal
Inhalation Toxicology
ISSN:
0895-8378
EISSN:
1091-7691
Volume
30
Issue
1
Page Numbers
19-28
Language
English
PMID
29465005
DOI
10.1080/08958378.2018.1438539
Web of Science Id
WOS:000427054600003
URL
http://
://WOS:000427054600003
Exit
Abstract
OBJECTIVE:
Most studies report that inhaled volatile and semivolatile organic compounds (VOCs/SVOCs) tend to deposit in the upper respiratory tract, while ultrafine (or near ultrafine) particulate matter (PM) (∼100 nm) reaches the lower airways. The objective of this study was to determine whether carbon particle co-exposure carries VOCs/SVOCs deeper into the lungs where they are deposited.
MATERIALS AND METHODS:
Male Sprague-Dawley rats were exposed by inhalation (nose-only) to radiolabeled toluene (20 ppm) or naphthalene (20 ppm) on a single occasion for 1 h, with or without concurrent carbon particle exposure (∼5 mg/m3). The distribution of radiolabel deposited within the respiratory tract of each animal was determined after sacrifice. The extent of adsorption of toluene and naphthalene to airborne carbon particles under the exposure conditions of the study was also assessed.
RESULTS:
We found that in the absence of particles, the highest deposition of both naphthalene and toluene was observed in the upper respiratory tract. Co-exposure with carbon particles tended to increase naphthalene deposition slightly throughout the respiratory tract, whereas slight decreases in toluene deposition were observed. Few differences were statistically significant. Naphthalene showed greater adsorption to the particles compared to toluene, but overall the particle-adsorbed concentration of each of these compounds was a small fraction of the total inspired concentration.
CONCLUSIONS:
These studies imply that at the concentrations used for the exposures in this study, inhaled carbon particles do not substantially alter the deposition of naphthalene and toluene within the respiratory tract.
Tags
IRIS
•
Naphthalene
Database Searches
PubMed
WOS
Combined data set
Data set for title/abstract screening
Data set for full text review
Excluded – PECO criteria not met (full-text)
Supplemental material
ADME/Toxicokinetics
Acute toxicity studies
Feb 2019 Update
PubMed
WOS
NAAQS
•
LitSearch-NOx (2024)
Forward Citation Search
Epidemiology
Results
Respiratory-ST
PubMed
WoS
•
Litsearch – PM ISA Supplement 2021
Pubmed iCite citation search (April 2021 BR)
PM2.5 Cardiovascular and Mortality Epi Search
Results
Merged search results (location and date exclusion applied)
Other
•
Naphthalene (2021 Evidence mapping publication)
Database Searches
PubMed
WOS
Combined data set
Data set for title/abstract screening
Data set for full text review
Excluded – PECO criteria not met (full-text)
Supplemental material
ADME/Toxicokinetics
Acute toxicity studies
Feb 2019 Update
PubMed
WOS
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity