ASTM E130-1987(2003) Standard Practice for Designation of Shapes and Sizes of Graphite Electrodes《石墨电极形状和尺寸的名称与符号》.pdf

1、Designation: E 130 87 (Reapproved 2003)Standard Practice forDesignation of Shapes and Sizes of Graphite Electrodes1This standard is issued under the fixed designation E 130; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year

2、of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers a number of specific graphiteelectrode shapes and sizes that are useful in spectrochemicalana

3、lysis.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Terminology2.1 preforma descriptive word applied to a commerciallyproduced spectroscopic electrode which is purified after ma-chining.3. Summary of Practice3.

4、1 The practice classifies electrodes by application andprovides dimensional specifications.4. Significance and Use4.1 This practice is intended as a reference for spectro-chemical methods that utilize graphite electrodes. Methodsshould employ and reference one of the electrode shapes in thispractice

5、, but if this is not possible, the method should includeelectrode specifications for the specific shape used.4.2 This practice should be referred to in a method byincluding a statement such as the following in the section onReagents and Materials:Graphite ElectrodesThe electrode(s) shall be of high-

6、purity graphite and conform to type(s) (insert designation fromthis method) as depicted in Practice E 130.5. Classes5.1 Seven classes of graphite electrodes are designated asfollows:5.1.1 Class CCounter Electrodes, for use opposite thespecimen or opposite the electrode that contains the specimen.5.1

7、.2 Class SSpecimen Electrodes, for use with liquid orparticulate specimens. Thin-wall cups allow faster burn off ofgraphite and faster consumption of the specimen. Undercutcups provide greater heating of the specimen.5.1.3 Class PSpecimen Electrodes, for use with noncon-ducting specimens or with spe

8、cimens that require a center postthat tends to stabilize the excitation.5.1.4 Class PCPorous Cup Electrodes, for use with liquidspecimens only.5.1.5 Class DSpecimen Electrodes, of disk shape for usewith liquid specimens.5.1.6 Class VC and VCEVacuum Cups and SpecimenElectrodes, consisting of a tubula

9、r graphite electrode overwhich is positioned a tetrafluorethylene (TFE) cup which holdsa liquid specimen.5.1.7 Class DCPElectrodes, for use as anodes on direct-current plasma spectrometers.6. Dimensions6.1 The dimensions of the electrodes of the various classesare given in Fig. 1. Unless exceptions

10、are indicated, thefollowing tolerances apply:6mm 6in.Outside diameter 0.05 0.002Length 0.41 0.016Cavity, inside diameter 0.08 0.003Cavity, depth 0.08 0.003Neck, outside diameter 0.13 0.005Neck, location 0.13 0.005Neck, length 0.13 0.005Concentricity, total indicator reading:Holes under 12.7 mm (0.5

11、in.) deep andundercuts0.13 0.005Holes over 12.7 mm (0.5 in.) deep 0.25 0.010Rotating disks, inside diameter 0.03 0.001Rotating disks, thickness 0.13 0.005Boiler caps, inside diameter 0.02 0.001Porous cups, bottom thickness:Under 25.4 mm (1 in.) long +0.05 +0.0020.00 0.000Over 25.4 mm (1 in.) long +0

12、.08 +0.0030.00 0.000Angle 60.51This practice is under the jurisdiction of ASTM Committee E01 on AnalyticalChemistry for Metals, Ores and Related Materials and is the direct responsibility ofSubcommittee E01.20 on Fundamental Practices.Current edition approved June 10, 2003. Published July 2003. Orig

13、inallyapproved in 1957. Last previous edition approved in 1996 as E 130 87 (1996).1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Certain methods, such as those employing carrier dis-tillation techniques, may require closer toler

14、ances than thosespecified in 6.1. The following special tolerances will beexceptions to the normal tolerances when the suffix (X) is usedalong with the class designation. For example, S-12(X) desig-nates the following exceptions to the normal tolerances:6mm 6in.Cavity, inside diameter 0.01 0.0005Cav

15、ity, depth 0.05 0.002Neck, outside diameter 0.05 0.002Neck, location 0.08 0.003Neck, length 0.08 0.003Rod, outside diameter 0.03 0.0017. Keywords7.1 graphite electrodes; spectrographic analysisFIG. 1 Recommended Shapes and Sizes of Graphite ElectrodesE 130 87 (2003)2FIG. 1 Recommended Shapes and Siz

16、es of Graphite Electrodes (continued)E 130 87 (2003)3FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130 87 (2003)4FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130 87 (2003)5FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130

17、 87 (2003)6FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130 87 (2003)7FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130 87 (2003)8FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130 87 (2003)9ASTM International takes no pos

18、ition respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. 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 responsibil

19、ity.This standard is subject to revision at any time by the responsible technical committee and must be reviewed 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 AS

20、TM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible 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

21、 shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, 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).FIG. 1 Recommended Shapes and Sizes of Graphite Electrodes (continued)E 130 87 (2003)10