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DEQ Laboratory Analytic Methods
Individual analytical methods are employed, developed, reviewed, and
maintained by each section.
- Northwest Total Petroleum Hydrocarbon
Discussion of overall procedure
- Northwest Total Petroleum
Hydrocarbon PDF
Capillary GC/FID Hydrocarbon Product Identification
- Northwest Total Petroleum
Hydrocarbon-Gx PDF
Capillary GC/PID-FID analysis of Gasoline Range Organics
- Northwest Total Petroleum
Hydrocarbon-Dx PDF
Capillary GC/FID analysis of Diesel Range Organics
- Ion Chromatography Analysis
of Ambient Air Particulate Matter PDF
Description: This method covers the determination of selected anions
and cations in air particulate collected on the surfaces of filters.
The ions that are determined may include sodium, ammonium,
potassium, magnesium, calcium, nitrate and sulfate. The method
includes procedures for (1) pre-sampling filter preparation, (2)
extraction, (3) standards preparation, (4) solution analysis by IC,
and (5) results calculations. The samples are collected using Oregon
MV samplers, Survey samplers, R&P Partisol samplers, or MetOne SASS
Speciation samplers. A modeling program, CMB (or Chemical Mass
Balance), utilizes some of the data. Another use of the data
includes particulate characterization for the PM2.5 Speciation
program.
- Elemental Analysis of Air
Particulate by Energy Dispersive X-ray Fluorescence (EDXRF) PDF
Description: This method describes the quantitative determination of
elements in ambient air particulate collected on Teflon membrane
filters. The elements that are determined by this method include
many of the elements with atomic numbers 11 (Na) through 82 (Pb).
(Note: both Na and Mg are reported as estimates due to several
factors which make reported low atomic numbers difficult--including
lack of sensitivity, difficulty correcting for interelement
interferences, high background, difficulty in modeling background,
and large particulate size correction factors.) The method assumes
that the particulate is collected as a surface deposit on top of the
filter media, that the particulate loading level is less than
approximately 100 ug/cm2, and that the filter matrix is relatively
uncontaminated with elements over Z=9. Quantitation is improved if
the size and the composition of the particles are known, but this is
not possible for unknown samples. The samples are collected using
Oregon MV samplers, Survey samplers, R&P Partisol samplers, and
MetOne Speciation samplers. A modeling program, CMB (or Chemical
Mass Balance), utilizes some of the data. Other uses of the data
include particulate characterization for the Air Toxics and PM2.5
Speciation programs.
- Speciation Sampling Canister
Processing PDF
Description: This method describes the cleaning, loading, and
unloading of the MetOne SASS speciation sampler canisters. At this
time, these canisters are used only in the collecting of ambient air
particulate matter for the PM2.5 Speciation program. Sampling and
analysis procedures are found in other SOPs. The results from the
Speciation program are used in modeling, SIP development, and air
toxics assessment. The canisters that DEQ prepares and analyze are
not used at sites that are part of the National Trends Network. We
have elected to have the work for the National Trends Network
performed by the EPA contract lab, in the interest of consistency.
- Gravimetric Analysis of
Particulate Collected with R&P Partisol Samplers and MetOne SASS
Samplers PDF
Description: This method describes the gravimetric analysis of
ambient air particulate samples collected on 47mm Teflon filters.
This method is specifically applicable to samples collected using
either an R&P Partisol sampler or a MetOne SASS sampler. The R&P
Partisol sampler has been used as the Federal Reference Method (FRM)
sampler for the PM2.5 program, although it can also be used for PM10
sampling.. The MetOne SASS sampler has been used for the Speciation
program within the PM2.5 program. This procedure also describes the
calculation of the particulate mass per volume of sampled air, using
both the laboratory gravimetric data and the field sampling data.
Although the sampling SOPs are described else where, the laboratory
personnel must be familiar with the sampling requirements. The
method complies with the national ambient air quality standards
referred to as PM2.5, as described in Appendix L of 40 CFR, Part 50.
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