1、Designation: E124 94 (Reapproved 2016)Standard Specification forWeighing and Drying Apparatus for Microchemical Analysis1This standard is issued under the fixed designation E124; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers apparatus used for weighingand drying operations in microchemical laboratory practic
3、e.1.2 The values stated in inch-pound units are to be regardedas the standard. The metric equivalents may be approximate.NOTE 1This specification was originally developed by the Committeeon MicrochemicalApparatus, Division ofAnalytical Chemistry,AmericanChemical Society.22. Referenced Documents2.1 A
4、STM Standards:3E671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory ApparatusE920 Specification for Commercially Packaged LaboratoryApparatusE921 Specification for Export Packaged Laboratory Appa-ratusE1133 Practice for Performance Testing of Packaged Labo
5、-ratory Apparatus for United States Government Procure-mentsE1157 Specification for Sampling and Testing of ReusableLaboratory Glassware3. Combustion Boats3.1 Combustion boats of three sizes shall conform to therequirements in Table 1 and Fig. 1, Fig. 2, and Fig. 3. Theseboats shall be made of plati
6、num-rhodium alloy containing3.5 % rhodium.4. Weighing Bottles4.1 Weighing bottles of seven capacities shall conform tothe requirements in Table 2 and Figs. 4-9, inclusive.5. Weighing Cup5.1 The weighing cup shall conform to the requirementsshown in Fig. 11, and shall be made of platinum-rhodium allo
7、ycontaining 3.5 % rhodium. The cup is designed to be used as asample container to fit into the weighing bottle shown in Fig.5, and is useful for weighing hygroscopic materials.6. Weighing Tubes6.1 Weighing tubes of three types shall conform to therequirements shown in Fig. 12, Fig. 13, and Fig. 14.
8、Thesetubes should preferably be made of soda-lime glass.7. Spatulas7.1 Spatulas of four types, and preferably made of stainlesssteel, shall conform to the following requirements:7.1.1 TypeA(Fig. 15)This spatula is generally useful. Thetop can be used for crushing crystals and the bent blade forscrap
9、ing containers.7.1.2 TypeB(Fig. 16)This spatula has a flat bent portionat one end and a V-shaped scoop at the other end. It isparticularly useful for weighing samples.7.1.3 TypeC(Fig. 17)This spatula is suitable for the largersamples commonly encountered in semimicro and preparativework. It has a U-
10、shaped scoop at one end and a V-shaped scoopat the other end. The spatula can be used to add shot or beadsto tare flasks and for measuring and introducing solid reagentinto combustion tubes.7.1.4 TypeD(Fig. 18)This spatula is useful in manymicrochemical applications.8. Forceps8.1 Forceps of two type
11、s, made of nickel-plated steel, shallconform to the following requirements:8.1.1 Forceps with Platinum5 % Ruthenium Tips (Fig. 19)The pin serves as a stop to prevent the forceps from beingdepressed to such an extent that the tips can open, allowing theheld object to drop. When pressed together, the
12、tips makecontact for a distance of14 to12 in. (6.4 to 12.7 mm).NOTE 2Depending upon the intended use, other materials may be1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplie
13、s.Current edition approved Sept. 1, 2016. Published September 2016. Originallyapproved in 1956. Last previous edition approved in 2010 as E124 94 (2010).DOI: 10.1520/E0124-94R16.2See the “1949 Report on Recommended Specifications for MicrochemicalApparatus, Carbon-Hydrogen, Dumas Nitrogen, Sulfur an
14、d Halogen,” AnalyticalChemistry, Vol 21, December 1949, p. 1555; and the “1953 Report on Recom-mended Specifications for Microchemical Apparatus, Weighing and Drying,”Analytical Chemistry, Vol 26, July 1954, p. 1186.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
15、 Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1substituted for the platinum al
16、loy. Thec construction and over-all dimen-sions should be identical with those shown in Fig. 19.8.1.2 Forceps with Conical Tapered Holders (Fig. 20)These forceps shall be made of spring steel. They are useful forhandling weighing tubes, absorption tubes, filter tubes, etc.9. Tare Flasks9.1 Tare flas
17、ks of three types, made of soda-lime glass, shallconform to the requirements shown in Fig. 21, Fig. 22, and Fig.23. The serial numbers shall be etched on the flasks.10. Metal Cooling Block10.1 The metal cooling block shall conform to the require-ments shown in Fig. 24, and shall be made of a metal o
18、r alloywith a high heat conductivity. The surface should be highlyresistant to abrasion and corrosion.11. Metal Crucible Container with Glass Cover11.1 This assembly shall conform to the requirementsshown in Fig. 25, and shall consist of an aluminum body anda borosilicate-glass cover. It may be used
19、 in combination withthe metal cooling block, Fig. 24. The combination, commonlytermed a “microdesiccator,” serves primarily as a container forcooling, storage, and safe transportation of microweighingequipment.12. Micro Glass Desiccator with Metal Insert12.1 The micro glass desiccator shall conform
20、to the re-quirements shown in Fig. 26. It shall consist of a glassdesiccator with cover and an aluminum insert which shall holdsecurely the metal cooling block, Fig. 24. This combinationserves the same purpose as that described in Section 11, butpermits the additional use of drying agents of other c
21、hemicalsin the bottom container.13. Drying Apparatus13.1 The drying apparatus shall be of the Abderhalden typeand shall conform to the requirements shown in Fig. 27.NOTE 3The shape of the tube attached to the ball joint, in thedesiccator bulb, is intended to prevent desiccant from being carried over
22、into the sample when the vacuum is broken. A cap for the ball joint andstopper for the standard taper 40/50 joint may be used to protect thedesiccant when the bulb is disconnected and stands alone. The upwardindentation in the vapor tube prevents cooling of the drying chamber bycold condensate.14. M
23、aximum Permissible Thermal Residual Stress14.1 The stress in all glass items described herein shallconform to Specification E671.15. Sampling and Testing15.1 For glass items, refer to Specification E1157.16. Packaging16.1 For packaging, select from Specification E920 orE921, or Practice E1133.17. Ke
24、ywords17.1 apparatus; microchemical; weighing and dryingE124 94 (2016)2TABLE 1 Combustion BoatsSize Figure UseApproximateWeight, gA 1 for samples of 1 to 5 mgA0.45B 2 for samples of 5 to 25 mgA0.7C 3 for samples over 25 mgA,B1.5AFor drying procedures, the Size A boat is used with the weighing bottle
25、, 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.BThe Size C boat is especially suitable for bulky materials and explosivesubstances, and for holding glass capillaries containing liquid
26、 samples.FIG. 1 Combustion Boat, Size AFIG. 2 Combustion Boat, Size BFIG. 3 Combustion Boat, Size CE124 94 (2016)3TABLE 2 Weighing BottlesFigureApproximateCapacity, mLApproximateWeight, gMaterial4A0.05 0.6 borosilicate glass5 0.75 2.5 soda-lime glass6B3 5.0 soda-lime glass7B,C3 5.7 soda-lime glass8D
27、0.5 1.5 aluminum alloy9D1 4.5 aluminum alloy0D2 6 aluminum alloyAThis bottle is intended for introducing samples into containers of small diameters.BThe cap of the bottle shown in Fig. 5 may be used instead of the caps with rodhandle shown in Figs. 6 and 7.CThis bottle, Fig. 7, is used for extremely
28、 hygroscopic materials; only the smallcap is removed for vacuum drying, and it is replaced as soon as the vacuum isreleased. The bottle containing the combustion boat with sample may be attachedto a combustion tube by means of a rubber adapter, and the boat pushed intoposition in the tube by passing
29、 a wire through the small joint.DThese bottles are designed for use in conjunction with the combustion boats,Figs. 1-3, as follows:Bottle Use with BoatFig. 8 Fig. 1Fig. 9 Fig. 2Fig. 10 Fig. 3The combination is useful for weighing and drying extremely hygroscopicmaterial. Sample, boat, and bottle are
30、 weighed, and the combination, withoutremoving the cap, is placed in the drying apparatus (Fig. 27). During drying, vaporsescape through the capillary. After drying, the combination is reweighed.FIG. 4 Weighing BottleFIG. 5 Weighing Bottle, Outside CapE124 94 (2016)4FIG. 6 Weighing Bottle, Pig-Type,
31、 with Outside CapsFIG. 7 Weighing Bottle, Pig-Type, with Two CapsFIG. 8 Weighing Bottle, Pig-Type, Metal, Size AFIG. 9 Weighing Bottle, Pig-Type, Metal, Size BE124 94 (2016)5FIG. 10 Weighing Bottle, Pig-Type, Metal, Size CFIG. 11 Weighing CupFIG. 12 Weighing TubeFIG. 13 Weighing Tube with CapE124 94
32、 (2016)6FIG. 14 Weighing Tube with Vented CapFIG. 15 Spatula, Metal, Type AE124 94 (2016)7FIG. 16 Spatula, Metal, Type BFIG. 17 Spatula, Metal, Type CE124 94 (2016)8FIG. 18 Spatula, Metal, Type DFIG. 19 Steel Forceps (Nickel Plated) with Platinum - 5 % Ruthenium TipsE124 94 (2016)9FIG. 20 Steel Forc
33、eps (Nickel Plated) with Conical Tapered Hold-ersFIG. 21 Tar Flask, Without Stopper, SmallFIG. 22 Tare Flask, Without Stopper, LargeE124 94 (2016)10FIG. 23 Tare Flask with StopperFIG. 24 Metal Cooling BlockFIG. 25 Metal Crucible Container with Glass CoverE124 94 (2016)11Metric Equivalentsin. 0.04018
34、3161471691634 2716mm. 11.0 3.2 4.8 6.4 11.1 14.3 19.1 61.9FIG. 26 Glass Desiccator with Metal InsertFIG. 27 Modified Abderhalden Drying ApparatusE124 94 (2016)12ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this sta
35、ndard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be revi
36、ewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsib
37、le technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Co
38、nshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 94 (2016)13
