ASTM E542-01
(Practice)Standard Practice for Calibration of Laboratory Volumetric Apparatus
Standard Practice for Calibration of Laboratory Volumetric Apparatus
SIGNIFICANCE AND USE
The primary purpose of this practice is to provide uniform procedures that may be used to accurately calibrate a wide variety of volumetric ware. The techniques are simple in concept and can provide reliable results, provided the procedures are followed faithfully. Accordingly, the practice should provide a means for checking the original calibration of glassware and similar apparatus and for periodic rechecks as the need should arise.
Borosilicate volumetric glassware will hold its calibration indefinitely provided that it is not exposed to hydrofluoric acid, hot phosphoric acid, or strong, hot alkalis, and that it is not heated above 150°C when dry. A frosting of the glass surface (viewed when dry) indicates that chemical attack has occured, and recalibration may be in order. As a precaution, however, it is recommended that the glassware be recalibrated after ten years of service regardless of its appearance.
Soda-lime volumetric glassware will become frosted with time because of attack from moisture in the atmosphere as well as from the chemicals mentioned above. In addition, it should not be heated above 90°C when dry. It is recommended, therefore, that it be recalibrated after five years of service unless frosting (viewed when dry) is observed sooner.
SCOPE
1.1 This practice covers procedures for use in the calibration of volumetric ware, in accordance with E694 such as is in common use in chemical and clinical laboratories. It is based on the gravimetric determination of the quantity of water either contained or delivered, and the conversion of this value to true volume at the standard temperature of 20oC by means of suitable equations and standard tables. Calibration using mercury is excluded. Calibration may be performed using alternative gravimetric methodology, provided that it is demonstrated and documented that the results obtained are equivalent to those obtained using the methodology described herein.
1.2 This practice is intended to encompass capacity ware between the limits of 0.1 cm3 and 2000 cm3. Typical products falling within the purview of this practice are burets graduated" to deliver", graduated cylinders, volumetric flasks, specific gravity flasks, measuring and dilution pipets, and transfer and capacity pipets.
1.3 The procedures are not recommended for calibration of apparatus with capacities below 0.1 cm3, such as microglassware.
1.4 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.
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Designation:E 542–01
Standard Practice for
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Calibration of Laboratory Volumetric Apparatus
This standard is issued under the fixed designation E 542; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3. Summary of Practice
1.1 Thispracticecoversproceduresforuseinthecalibration 3.1 This practice is based upon a determination of the
of volumetric ware, in accordance with Specification E694 volume of water either contained in or delivered by the vessel.
suchasisincommonuseinchemicalandclinicallaboratories. Procedures are given for cleaning, setting the meniscus,
It is based on the gravimetric determination of the quantity of manipulating the apparatus, weighing, and converting the
water either contained or delivered, and the conversion of this weight to the appropriate standard volume.
value to true volume at the standard temperature of 20°C by
4. Significance and Use
means of suitable equations and standard tables. Calibration
4.1 The primary purpose of this practice is to provide
using mercury is excluded. Calibration may be performed
using alternative gravimetric methodology, provided that it is uniform procedures that may be used to accurately calibrate a
wide variety of volumetric ware. The techniques are simple in
demonstrated and documented that the results obtained are
equivalent to those obtained using the methodology described concept and can provide reliable results, provided the proce-
dures are followed faithfully.Accordingly, the practice should
herein.
1.2 This practice is intended to encompass capacity ware provide a means for checking the original calibration of
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glassware and similar apparatus and for periodic rechecks as
between the limits of 0.1 cm and 2000 cm . Typical products
fallingwithinthepurviewofthispracticeareburetsgraduated“ the need should arise.
4.2 Borosilicate volumetric glassware will hold its calibra-
to deliver”, graduated cylinders, volumetric flasks, specific
gravity flasks, measuring and dilution pipets, and transfer and tion indefinitely provided that it is not exposed to hydrofluoric
acid, hot phosphoric acid, or strong, hot alkalis, and that it is
capacity pipets.
not heated above 150°C when dry. A frosting of the glass
1.3 The procedures are not recommended for calibration of
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apparatus with capacities below 0.1 cm , such as microglass- surface (viewed when dry) indicates that chemical attack has
occured, and recalibration may be in order. As a precaution,
ware.
1.4 This standard does not purport to address all of the however, it is recommended that the glassware be recalibrated
after ten years of service regardless of its appearance.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 4.3 Soda-lime volumetric glassware will become frosted
withtimebecauseofattackfrommoistureintheatmosphereas
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. well as from the chemicals mentioned above. In addition, it
shouldnotbeheatedabove90°Cwhendry.Itisrecommended,
2. Referenced Documents
therefore, that it be recalibrated after five years of service
2.1 ASTM Standards: unless frosting (viewed when dry) is observed sooner.
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E1 Specification for ASTM Thermometers
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5. Units of Measurement
E694 Specification for Volumetric Ware
5.1 Capacity—The basic SI unit for volume is the cubic
SI10 Standard for Use of the International System of Units
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(SI) (the Modernized Metric System) metre, m . Due to its large size, it is rarely used in volumetric
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calibration. Rather, the cubic centimetre, cm , is used and will
be employed in this practice. The unit, millilitre, mL, may be
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considered as equivalent to the cubic centimetre.
This practice is under the jurisdiction ofASTM Committee E41 on Laboratory
Apparatus, and is the direct responsibility of Subcommittee E41.01 on Apparatus.
5.2 Standard Temperature—Volumetric ware is almost uni-
Current edition approved Octo. 10, 2001. Published January 2002. Originally
versally calibrated at 20°C. The procedures described provide
published as E542–79. Last previous edition E542–00.
2 for such a calibration. When it is necessary to work at higher
Annual Book of ASTM Standards, Vol 14.03.
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Annual Book of ASTM Standards, Vol 14.04. ambient temperatures, such as is the case in tropical countries,
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