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Sampling results of the improved SKC diesel particulate matter cassette.

Authors

Noll-JD; Timko-RJ; McWilliams-LJ; Hall-P; Haney-R

Source

J Occup Environ Hyg 2005 Jan; 2(1):29-37

Link

http://www.tandf.co.uk/journals/titles/15459624.asp 

NIOSHTIC No.

20026481 

Abstract

Diesel particulate matter (DPM) samples from underground metal/nonmetal mines are collected on quartz fiber filters and measured for carbon content using NIOSH Method 5040. If size-selective samplers are not used to collect DPM in the presence of carbonaceous ore dust, both the ore dust and DPM will collect on the quartz filters, causing the carbon attributed to DPM to be artificially high. Because the DPM particle size is much smaller than that of mechanically generated mine dust aerosols, it can be separated from the larger mine dust aerosol by a single-stage impactor. The SKC DPM cassette is a single-stage impactor designed to collect only DPM aerosols in the presence of carbonaceous mine ore aerosols, which are commonly found in underground nonmetal mines. However, there are limited data on how efficiently the SKC DPM cassette can collect DPM in the presence of ore dust. In this study, we investigated the ability of the SKC DPM cassette to collect DPM while segregating ore dust from the sample. We found that the SKC DPM cassette accurately collected DPM. In the presence of carbon-based ore aerosols having an average concentration of 8 milligrams per cubic meter, no ore dust was detected on SKC DPM cassette filters. We did discover a problem: the surface areas of the DPM deposits on SKC DPM cassettes, manufactured prior to August 2002, were inconsistent. To correct this problem, SKC modified the cassette. The new cassette produced, with 99% confidence, a range of DPM deposit areas between 8.05 and 8.28 cubic centimeters, a difference of less than 3%.

Keywords

Carbon; Diesel-particulate-matter; Dusts; Impactor; Underground-mining; Metal-mining; Nonmetal-mining; Aerosols; Dust-samplers; Laboratory-testing; Respirable-dust; Occupational-health; Occupational-diseases; Occupational-hazards; Health-hazards

Contact

NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236

CODEN

JOEHA2

Publication Date

20050101

Document Type

Journal Article

Email Address

JNoll@cdc.gov

Fiscal Year

2005

NTIS Accession No.

NTIS Price

Issue of Publication

1

ISSN

1545-9624

NIOSH Division

PRL

Source Name

Journal of Occupational and Environmental Hygiene

State

PA; NJ; GA