ASTM E124-94(1999)
(Specification)Standard Specification for Weighing and Drying Apparatus for Microchemical Analysis
Standard Specification for Weighing and Drying Apparatus for Microchemical Analysis
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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: E 124 – 94 (Reapproved 1999)
Standard Specification for
Weighing and Drying Apparatus for Microchemical Analysis
This standard is issued under the fixed designation E 124; 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 5. Weighing Cup
1.1 This specification covers apparatus used for weighing 5.1 The weighing cup shall conform to the requirements
and drying operations in microchemical laboratory practice. shown in Fig. 11, and shall be made of platinum-rhodium alloy
1.2 The values stated in inch-pound units are to be regarded containing 3.5 % rhodium. The cup is designed to be used as a
as the standard. The metric equivalents may be approximate. sample container to fit into the weighing bottle shown in Fig.
5, and is useful for weighing hygroscopic materials.
NOTE 1—ThisspecificationwasoriginallydevelopedbytheCommittee
on MicrochemicalApparatus, Division ofAnalytical Chemistry,American
6. Weighing Tubes
Chemical Society.
6.1 Weighing tubes of three types shall conform to the
2. Referenced Documents
requirements shown in Fig. 12, Fig. 13, and Fig. 14. These
tubes should preferably be made of soda-lime glass.
2.1 ASTM Standards:
E 671 Specification for Maximum Permissible Thermal Re-
7. Spatulas
sidual Stress in Annealed Laboratory Apparatus
7.1 Spatulas of four types, and preferably made of stainless
E 920 Specification for Commercially Packaged Laboratory
steel, shall conform to the following requirements:
Apparatus
7.1.1 TypeA(Fig.15)—Thisspatulaisgenerallyuseful.The
E 921 Specification for Export Packaged Laboratory Appa-
top can be used for crushing crystals and the bent blade for
ratus
scraping containers.
E 1133 Practice for PerformanceTesting of Packaged Labo-
7.1.2 Type B (Fig. 16)—This spatula has a flat bent portion
ratory Apparatus United States Government Procurement
at one end and a V-shaped scoop at the other end. It is
E 1157 Specification for Sampling and Testing Laboratory
particularly useful for weighing samples.
Glassware
7.1.3 Type C (Fig. 17)—This spatula is suitable for the
3. Combustion Boats
larger samples commonly encountered in semimicro and pre-
parative work. It has a U-shaped scoop at one end and a
3.1 Combustion boats of three sizes shall conform to the
V-shapedscoopattheotherend.Thespatulacanbeusedtoadd
requirements in Table 1 and Fig. 1, Fig. 2, and Fig. 3. These
shot or beads to tare flasks and for measuring and introducing
boats shall be made of platinum-rhodium alloy containing
solid reagent into combustion tubes.
3.5 % rhodium.
7.1.4 Type D (Fig. 18)—This spatula is useful in many
4. Weighing Bottles
microchemical applications.
4.1 Weighing bottles of seven capacities shall conform to
8. Forceps
the requirements in Table 2 and Figs. 4-9, inclusive.
8.1 Forceps of two types, made of nickel-plated steel, shall
conform to the following requirements:
This specification is under the jurisdiction of ASTM Committee E-41 on
8.1.1 Forceps with Platinum—5% Ruthenium Tips (Fig.
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
19) The pin serves as a stop to prevent the forceps from being
Apparatus.
Current edition approved Feb. 15, 1994. Published April 1994. Originally
depressed to such an extent that the tips can open, allowing the
published as E 124 – 56. Last previous edition E 124 – 61 (1988).
held object to drop. When pressed together, the tips make
See the “1949 Report on Recommended Specifications for Microchemical
1 1
contact for a distance of ⁄4 to ⁄2 in. (6.4 to 12.7 mm).
Apparatus, Carbon-Hydrogen, Dumas Nitrogen, Sulfur and Halogen,” Analytical
Chemistry, Vol 21, December 1949, p. 1555; and the “1953 Report on Recom-
NOTE 2—Depending upon the intended use, other materials may be
mended Specifications for Microchemical Apparatus, Weighing and Drying,”
substituted for the platinum alloy. Thec construction and over-all dimen-
Analytical Chemistry, Vol 26, July 1954, p. 1186.
3 sions should be identical with those shown in Fig. 19.
Annual Book of ASTM Standards, Vol 14.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 124 – 94 (1999)
8.1.2 Forceps with Conical Tapered Holders (Fig. 20)— securely the metal cooling block, Fig. 24. This combination
These forceps shall be made of spring steel.They are useful for serves the same purpose as that described in Section 11, but
handling weighing tubes, absorption tubes, filter tubes, etc. permits the additional use of drying agents of other chemicals
in the bottom container.
9. Tare Flasks
13. Drying Apparatus
9.1 Tare flasks of three types, made of soda-lime glass, shall
13.1 The drying apparatus shall be of theAbderhalden type
conformtotherequirementsshowninFig.21,Fig.22,andFig.
and shall conform to the requirements shown in Fig. 27.
23. The serial numbers shall be etched on the flasks.
NOTE 3—The shape of the tube attached to the ball joint, in the
10. Metal Cooling Block
desiccator bulb, is intended to prevent desiccant from being carried over
10.1 The metal cooling block shall conform to the require- into the sample when the vacuum is broken. A cap for the ball joint and
stopper for the standard taper 40/50 joint may be used to protect the
ments shown in Fig. 24, and shall be made of a metal or alloy
desiccant when the bulb is disconnected and stands alone. The upward
with a high heat conductivity. The surface should be highly
indentation in the vapor tube prevents cooling of the drying chamber by
resistant to abrasion and corrosion.
cold condensate.
11. Metal Crucible Container with Glass Cover
14. Maximum Permissible Thermal Residu
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.