ASTM E137-82 (1987)

Practice for Evaluation of Mass Spectrometers for Quantitative Analysis from a Batch Inlet (Withdrawn 1992)

General Information

• Status: Withdrawn
• Withdrawal Date: 14-Aug-1992
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.04.0M - Mass Spectrometry

Standards Content (Sample)

ASTM EL37 82 i 07595110 OOq2902 8
([) Designation: E 137 - 82 (Reapproved 1987)
Standard Practice for
Evaluation of Mass Spectrometers for Quantitative Analysis
From a Batch Inlet'
This standard is issued under the fixed designation E 131; the number immediately foliowing 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 (€1 indicates an editorial change since the last revision or reapproval.
1. Scope followed by separation of the ions according to mass-
to-charge ratio and recording of a measure of the numbers of
1.1 This practice provides general criteria and tes& that
the various ions.
are generally helpful for evaluating a mass spectrometer for
3.2 Background-The term background refers to the
use in ASTM mass spectrometric methods of chemical
response (mass spectrum) obtained from a mass spectrom-
analysis. The number of types of mass spectrometers avail-
eter with operating conditions the same as those used for
able, and the variety of materials that may be analyzed,
sample analysis except that the sample is absent.
preclude a discussion in this practice of the capabilities of
3.3 Sensitivity-The sensitivity of a mass spectrometer for
each type of mass spectrometer for each specific method of
a particular compound is a measure of the response of the
analysis. Neither is it intended to include all the technical
of sample, at a specified mass peak
instrument, per unit
considerations involved in procuring a new mass spectrom-
under specified operating conditions.
eter, Such considerations as mass range, sample introduction
3.4 Resolution-The resolution of a mass spectrometer
facilities, programming and data handling systems, scan rate,
refers to the ability of the instrument to distinguish between
maintenance requirements, and price must all be evaluated
two adjacent mass peaks under given experimental condi-
relative to the needs and facilities avaiiable in a specific
tions: Two adjacent peaks of equal height are said to be
laboratory.
resolved when the minimum height above base line in the
1.2 This standard may involve hazardota materials, oper-
valley between them is less than 10 percenf of the common
ations, and equipment. This standard does not purport to
peak height. The resolution exhibited by two adjacent peaks
address all of the safety problems associated with its use. it is
of equal height is defined numerically as the ratio of their
the responsibility of the tiser of this standard to establish
average mass to the mass difference between them when a
appropriate safety and health practices and determine the
valley condition of 10 percent prevails. A statement of
applicability of regulatory limitations prior to use.
mass-to-charge ratios for the peaks used is pertinent to a
comparison of resolution data, because different instrument
2. Reference to This Practice in Standards
types show differences in the variation of resolution with
2.1 The inclusion of the foliowing paragraph, or suitable
mass-to-charge ratio.
equivalent, in any ASTM mass spectrometric method (pref-
NOTE 1-Alternatively, the resolution R achieved at any isolated
erably after the section on Scope) shall constitute due
peak in a mass spectrum may be calculated from the equation R =
notification that mass spectrometers to be used with that
m/Am, where m is the mass corresponding to the peak and Am is the
method are to be evaluated in accordance with the recom-
width (in mass units) at 5 percent of the peak height.
mendations set forth in this practice.
The equation is better adapted to typical experimental data than the
Evaluation of Mass Spectrometers-The suitability of 10 percent vaiiey definition, but is technicaliy equivalent to it, provided
mass spectrometers for use with this method of analysis shail the peak is symmetrical and the mass spectrometer system linear in the
range between the 5 and 10 percent levels of the peak. The equation and
be evaluated by means of performance tests described in this
definition are in practice equivalent within the range of typical devia-
method and in ASTM Practice E 137, for Evaluation of Mass
tions from symmetry and linearity.
Spectrometers for Quantitative Analysis from a Batch Inlet.
3.5 Interference-The term interference refers to an in-
strumental condition which prevents attaining the usual
3. Terminology
accuracy in determining the concentration of a component
3.1 Mass Spectrometer or Mass Spectrometric-The term
in a sample mixture.
mass spectrometer or the adjectival form, mass spectro-
3.6 Test Mixture-The term test mixture refers to a
metric, shall apply to all apparatus in which an.analysis of
mixture of known composition that is similar to the compo-
matter is effected by means of ionization of the matter
sition of a sample to be analyzed. A test mixt
...