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ASTM D 6420 Document Information:
Title
Standard Test Method for Determination of Gaseous Organic Compounds by Direct Interface Gas Chromatography-Mass Spectrometry
ASTM International
Publication Date:
May 10, 1999
Scope:
This test method employs a direct interface gas chromatograph/mass
spectrometer (GCMS) to identify
and quantify the 36 volatile organic compounds (or sub-set of these
compounds) listed as follows.
The individual Chemical Abstract Service (CAS) numbers are listed
after each compound.
The test method incorporates a performance-based approach, which
validates each GCMS analysis by
placing boundaries on the instrument response to gaseous internal
standards and their specific mass
spectral relative abundance. Using this approach, the test method may
be extended to analyze other
compounds.
The test method provides on-site analysis of extracted, unconditioned,
and unsaturated (at the
instrument) gas samples from stationary sources. Gas streams with high
moisture content may require
conditioning to prevent moisture condensation within the instrument.
For these samples, quality
assurance (QA) requirements are provided in the test method to
validate the analysis of polar,
water-soluble compounds.
The instrument range should be sufficient to measure the listed
volatile organic compounds from 150
ppb(v) to 100 ppm(v), using a full scan operation (between 45 and 300
atomic mass units). The range
may be extended to higher or lower concentrations using either of the
following procedures:
The initial three-point calibration concentrations and the continuing
calibration checks are
adjusted to match the stack concentrations, or
The three-point calibration is extended to include additional
concentrations to cover the
measurement range.
The minimum quantification level is 50 % of the lowest calibration
concentration. Responses below
this level are considered to be estimated concentrations, unless a
calibration standard check is
conducted at a lower concentration to demonstrate linearity. The
sensitivity of the GCMS
measurement system for the individual target analytes depends upon:
The specific instrument response for each target analyte and the
number of mass spectral
quantification ions available.
The amount of instrument noise, and
The percent moisture content of the sample gas.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. Additional
safety precautions are described in Section 9.
Keywords:
- gas chromatography
- mass spectrometry
- stack gas analysis
- stationary source
- volatile organic hazardous air pollutant
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