ASTM E124-94(2010)

Standard Specification for Weighing and Drying Apparatus for Microchemical Analysis

ABSTRACT
This specification covers the general requirements for the components that comprise the apparatus used for the weighing and drying operations in the laboratory practice of microchemical analysis. The components covered here are the following: combustion boats; weighing bottles, cup, and tubes; spatulas; forceps; tare flasks; metal cooling block; metal crucible container with glass cover; and micro glass desiccator with metal insert.
SCOPE
1.1 This specification covers apparatus used for weighing and drying operations in microchemical laboratory practice.
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents may be approximate.
Note 1—This specification was originally developed by the Committee on Microchemical Apparatus, Division of Analytical Chemistry, American Chemical Society.

General Information

• Status: Historical
• Publication Date: 30-Jun-2010
• ICS: 71.040.20 - Laboratory ware and related apparatus
• Technical Committee: E41 - Laboratory Apparatus
• Drafting Committee: E41.01 - Laboratory Ware and Supplies

Relations

• Replaces: ASTM E124-94(2005) - Standard Specification for Weighing and Drying Apparatus for Microchemical Analysis
• Effective Date: 01-Jul-2010
• Referred By: ASTM E147-61(2022) - Standard Specification for Apparatus for Microdetermination of Nitrogen by Kjeldahl Method
• Effective Date: 01-Jul-2010
• Referred By: ASTM E191-64(2017) - Standard Specification for Apparatus For Microdetermination of Carbon and<brk/> Hydrogen in Organic and Organo-Metallic Compounds (Withdrawn 2024)
• Effective Date: 01-Jul-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E124 −94(Reapproved 2010)
Standard Specification for
Weighing and Drying Apparatus for Microchemical Analysis
This standard is issued under the fixed designation E124; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Weighing Bottles
4.1 Weighing bottles of seven capacities shall conform to
1.1 This specification covers apparatus used for weighing
the requirements in Table 2 and Figs. 4-9, inclusive.
and drying operations in microchemical laboratory practice.
1.2 The values stated in inch-pound units are to be regarded
5. Weighing Cup
as the standard. The metric equivalents may be approximate.
5.1 The weighing cup shall conform to the requirements
NOTE 1—This specification was originally developed by the Committee shown in Fig. 11, and shall be made of platinum-rhodium alloy
on MicrochemicalApparatus, Division ofAnalytical Chemistry,American
containing 3.5 % rhodium. The cup is designed to be used as a
Chemical Society.
sample container to fit into the weighing bottle shown in Fig.
5, and is useful for weighing hygroscopic materials.
2. Referenced Documents
6. Weighing Tubes
2.1 ASTM Standards:
E671 Specification for Maximum Permissible Thermal Re-
6.1 Weighing tubes of three types shall conform to the
sidual Stress in Annealed Glass Laboratory Apparatus
requirements shown in Fig. 12, Fig. 13, and Fig. 14. These
E920 Specification for Commercially Packaged Laboratory
tubes should preferably be made of soda-lime glass.
Apparatus
7. Spatulas
E921 Specification for Export Packaged Laboratory Appa-
ratus
7.1 Spatulas of four types, and preferably made of stainless
E1133 Practice for Performance Testing of Packaged Labo-
steel, shall conform to the following requirements:
ratory Apparatus for United States Government Procure-
7.1.1 TypeA(Fig. 15)—This spatula is generally useful.The
ments
top can be used for crushing crystals and the bent blade for
E1157 Specification for Sampling and Testing of Reusable
scraping containers.
Laboratory Glassware
7.1.2 TypeB(Fig. 16)—This spatula has a flat bent portion
at one end and a V-shaped scoop at the other end. It is
3. Combustion Boats
particularly useful for weighing samples.
7.1.3 TypeC(Fig.17)—Thisspatulaissuitableforthelarger
3.1 Combustion boats of three sizes shall conform to the
samples commonly encountered in semimicro and preparative
requirements in Table 1 and Fig. 1, Fig. 2, and Fig. 3. These
work.IthasaU-shapedscoopatoneendandaV-shapedscoop
boats shall be made of platinum-rhodium alloy containing
at the other end. The spatula can be used to add shot or beads
3.5 % rhodium.
to tare flasks and for measuring and introducing solid reagent
into combustion tubes.
7.1.4TypeD(Fig. 18)—This spatula is useful in many
This specification is under the jurisdiction of ASTM Committee E41 on
microchemical applications.
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
Apparatus.
8. Forceps
Current edition approved July 1, 2010. Published July 2010. Originally approved
in 1956. Last previous edition approved in 2005 as E124 – 94 (2005). DOI:
8.1 Forceps of two types, made of nickel-plated steel, shall
10.1520/E0124-94R10.
2 conform to the following requirements:
See the “1949 Report on Recommended Specifications for Microchemical
Apparatus, Carbon-Hydrogen, Dumas Nitrogen, Sulfur and Halogen,” Analytical
8.1.1 ForcepswithPlatinum—5%RutheniumTips(Fig.19)
Chemistry, Vol 21, December 1949, p. 1555; and the “1953 Report on Recom-
The pin serves as a stop to prevent the forceps from being
mended Specifications for Microchemical Apparatus, Weighing and Drying,”
depressed to such an extent that the tips can open, allowing the
Analytical Chemistry, Vol 26, July 1954, p. 1186.
held object to drop. When pressed together, the tips make
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1 1
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
contact for a distance of ⁄4 to ⁄2 in. (6.4 to 12.7 mm).
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. NOTE 2—Depending upon the intended use, other materials may be
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E124−94 (2010)
TABLE 1 Combustion Boats
Approximate
Size Figure Use
Weight, g
A
A 1 for samples of 1 to 5 mg 0.45
A
B 2 for samples of 5 to 25 mg 0.7
A,B
C 3 for samples over 25 mg 1.5
A
For drying procedures, the Size A boat is used with the weighing bottle, Fig. 8.
Sizes B and C can be used either with the metal weighing bottles, Figs. 9 and 10,
respectively, or with the glass weighing bottles, pig-type, Figs. 6 and 7.
B
The Size C boat is especially suitable for bulky materials and explosive
substances, and for holding glass capillaries containing liquid samples.
with a high heat conductivity. The surface should be highly
resistant to abrasion and corrosion.
11. Metal Crucible Container with Glass Cover
11.1 This assembly shall conform to the requirements
shown in Fig. 25, and shall consist of an aluminum body and
a borosilicate-glass cover. It may be used in combination with
the metal cooling block, Fig. 24. The combination, commonly
FIG. 1 Combustion Boat, Size A
termed a “microdesiccator,” serves primarily as a container for
cooling, storage, and safe transportation of microweighing
equipment.
12. Micro Glass Desiccator with Metal Insert
12.1 The micro glass desiccator shall conform to the re-
quirements shown in Fig. 26. It shall consist of a glass
desiccator with cover and an aluminum insert which shall hold
securely the metal cooling block, Fig. 24. This combination
serves the same purpose as that described in Section 11, but
permits the additional use of drying agents of other chemicals
FIG. 2 Combustion Boat, Size B
in the bottom con
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