ASTM E1812-96
(Practice)Standard Practice for Optimization of Flame Atomic Absorption Spectrometric Equipment
Standard Practice for Optimization of Flame Atomic Absorption Spectrometric Equipment
SCOPE
1.1 This practice covers the optimization of flame atomic absorption spectrometers and the checking of spectrometer performance criteria.
1.2 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. For specific hazards associated with the use of this practice see Practices E50 and warning statement included in this practice.
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Standards Content (Sample)
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Designation: E 1812 – 96
Standard Practice for
Optimization of Flame Atomic Absorption Spectrometric
Equipment
This standard is issued under the fixed designation E 1812; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2 Radiation Source—Hollow cathode lamp or electrode-
less discharge lamp for the analyte(s).
1.1 This practice covers the optimization of flame atomic
4.3 For a general discussion of the instrumental require-
absorption spectrometers and the checking of spectrometer
ments for flame atomic absorption see Practice E 863.
performance criteria.
4.4 For a general discussion of apparatus requirements see
1.2 This standard does not purport to address all of the
Practices E 50.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Reagents
priate safety and health practices and determine the applica-
5.1 Purity and Concentration of Reagents—The purity and
bility of regulatory limitations prior to use. For specific hazards
concentration of common chemical reagents shall conform to
associated with the use of this practice see Practices E 50 and
Practices E 50. The reagents should be free of or contain
warning statement included in this practice.
minimal amounts (<0.1 μg/g) of the analyte of interest.
2. Referenced Documents 5.2 Calibration Solutions—Refer to the preparation of cali-
bration solutions in the relevant analytical method and 7.1.1 of
2.1 ASTM Standards:
this practice. Also refer to Practice E 1452.
E 50 Practices for Apparatus, Reagents, and Safety Precau-
tions for Chemical Analysis of Metals
6. Instrument Adjustments
E 863 Practice for Describing Flame Atomic Absorption
6.1 Determine the flame type (air-acetylene or nitrous
Spectroscopy Equipment
oxide/acetylene) to be used by the relevant analytical proce-
E 1452 Practice for Preparation of Calibration Solutions for
dure. Set up the atomic absorption spectrometer to operate with
Spectrophotometric and Spectroscopic Atomic Analysis
the appropriate single slot laminar flow burner head in accor-
3. Significance and Use dance with the manufacturer’s instructions.
3.1 This practice is used for optimizing the parameters in
NOTE 1—Warning: A “flashback” may occur if a nitrous oxide/
the analysis of metals and alloys by flame atomic absorption acetylene flame is used with burners not specifically designed for a nitrous
oxide/acetylene flame, particularly on older or more basic instruments.
spectrometry and also describes the practice of checking the
spectrometer performance. The work is expected to be per-
6.2 Use a single-element radiation source (hollow cathode
formed in a properly equipped laboratory, and appropriate
or electrodeless discharge lamp) as the light source under test.
disposal procedures are to be followed.
Operate the lamp as directed by the manufacturer.
4. Apparatus NOTE 2—The use of multielement lamps is not generally recom-
mended, especially if one of the elements contained in them is iron.
4.1 Atomic Absorption Spectrometer, equipped with an
However, some binary alloy lamps give a more stable emission than
appropriate background corrector, a signal output device (such
single-element lamps.
as a video display screen, or VDS), a digital computer, a printer
6.3 Light the burner and aspirate water until a thermal
or strip chart recorder, and an optional autosampler.
equilibrium is reached. Pass a cleaning wire through the
nebulizer. Check the burner slot for any buildup which may
This practice is under the jurisdiction of ASTM Committee E-1 on Analytical
clog the burner.
Chemistry for Metals, Ores, and Related Materials and is the direct responsibility of
6.4 Aspirate a mid-range calibration solution of the element
Subcommittee E01.20 on Fundamental Practices.
being tested and adjust the instrument to give optimum
Current edition approved May 10, 1996. Published July 1996.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
absorption. Use the wavelength setting specified in the relevant
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
analytical method. Use the slit setting or bandpass recom-
Standards volume information, refer to the standard’s Document Summary page on
mended by the instrument manufacturer for the element being
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1812–96
tested and the wavelength specified. Adjust the burner heights 7.3.3 The linearity of the instrument response for the
and alignment for optimum absorption. The use of scale procedure is acceptable if this ratio is 0.70 or greater.
expansion may be necessary. 7.
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