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  • ASTM
    D6348-98 Standard Test Method for Determination of Gaseous Compounds by Extractive Direct Interface Fourier Transform Infrared (FTIR) Spectroscopy
    Edition: 1998
    $103.58
    Unlimited Users per year

Description of ASTM-D6348 1998

ASTM D6348-98

Historical Standard: ASTM D6348-98 Standard Test Method for Determination of Gaseous Compounds by Extractive Direct Interface Fourier Transform Infrared (FTIR) Spectroscopy

SUPERSEDED (see Active link, below)




ASTM D6348

1. Scope

1.1 This field test method employs an extractive sampling system to direct stationary source effluent to an FTIR spectrometer for the identification and quantification of gaseous compounds. This test method is potentially applicable for the determination of compunds that (1) have sufficient vapor pressure to be transported to the FTIR spectrometer and (2) absorb a sufficient amount of infrared radiation to be detected.

1.2 This field test method provides near real time analysis of extracted gas samples from stationary sources. Gas streams with high moisture content may require conditioning to minimize the excessive spectral absorption features imposed by water vapor.

1.3 This field test method requires the preparation of a source specific field test plan. The test plan must include the following: (1) the identification of the specific target analytes (2) the known analytical interferents specific to the test facility source effluent (3) the test data quality necessary to meet the specific test requirements and (4) the results obtained from the laboratory testing (see Annex A1 for test plan requirements).

1.4 The FTIR instrument range should be sufficient to measure from high ppm(v) to ppb(v) and may be extended to higher or lower concentrations using any or all of the following procedures:

1.4.1 The gas absorption cell path length may be either increased or decreased,

1.4.2 The sample conditioning system may be modified to reduce the water vapor, CO 2 , and other interfering compounds to levels that allow for quantification of the target compound(s), and

1.4.3 The analytical method may be modified such that interfering absorbance bands are minimized or stronger/weaker absorbance bands are employed for the target analytes.

1.5 The practical minimum detectable concentration is instrument, compound, and interference specific (see Annex A2 for procedures to estimate the achievable minimum detectable concentrations (MDCs)). Detection limits in the parts per billion range are possible; however, the actual sensitivity of the FTIR measurement system for the individual target analytes depends upon the following:

1.5.1 The specific infrared absorptivity (signal) and wavelength analysis region for each target analyte,

1.5.2 The amount of instrument noise (see Annex A6), and

1.5.3 The concentration of interfering compounds in the sample gas (in particular, percent moisture and CO 2 ), and the amount of spectral overlap imparted by these compounds in the wavelength region(s) used for the quantification of the target analytes.

1.6 Practices E 168 and E 1252 are suggested for additional reading.

1.7 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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1356 Terminology Relating to Sampling and Analysis of Atmospheres

D3195 Practice for Rotameter Calibration

E168 Practices for General Techniques of Infrared Quantitative Analysis

E1252 Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis

EPA Methods (40 CFR Part 60 Appendix A)

Method4Series Determination of Moisture Content in Stack Gases

Keywords

Fourier transform infrared spectroscopy; stack gas analysis; stationary source; Detector linearity; Extractive direct interface FTIR analysis; FTIR analysis; FTIR reference spectra; Line position/resolution; MDC (minimum detectable concentration); Noise equivalent absorbance (NEA); Post-test QA/QC; Pre-test procedures; Spike gas; Stack gas analysis; Stationary source; Analyte spiking technique; Analytical quantification method; CTS (calibration transfer standard); Data quality objectives (DQO)


ICS Code

ICS Number Code 71.040.40 (Chemical analysis)


DOI: 10.1520/D6348-98

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ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.

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