ASTM E1251 PDF
E – 07 Standard Test Method for Analysis of Aluminum and Aluminum Alloys by Atomic Emission Spectrometry, aluminum, aluminum alloys, atomic. Buy ASTM E TEST METHOD FOR ANALYSIS OF ALUMINUM AND ALUMINUM ALLOYS BY SPARK ATOMIC EMISSION. ASTM E Standard Test Method for Analysis of Aluminum and Aluminum Alloys by Spark Atomic Emission Spectrometry Scope
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Argon gas shall be introduced just inside the fused quartz window, owing toward the discharge, to prevent any of the metal powder produced at the discharge from coating the inside of the window. The lines listed have proven satisfactory for the elements and concentration ranges prescribed in the Scope.
Accurate, high-speed analysis of aluminum, before it is poured from e12251 furnace, can prevent scrapped heats and minimize the cost of expensive alloying metals. Historical Version s – view previous versions of standard. For specimens with such low concentrations, single point standardization, either with the blank or another specimen, may give more consistent results.
ASTM E1251 – 17a
Originally published as E — Link to Active This link will always route to the current Active version of the standard. Also, other sample forms can be melted and cast into a disk, using an appropriate mold, as described in Practices E Cylinders of either compressed argon gas or liquid argon may be employed.
The range shown for each element does not demonstrate the actual usable analytical range for that element. The relative standard deviations of the internal standard intensities shall be less than 1.
The system also may contain the program circuitry that times the ush, pre-burn and exposure intervals, turns the source on and off, etc.
The concentration ranges given in the above scope were established through cooperative testing ILS of selected reference materials. For unknown specimens where usually two burns are used, this means at least four burns of the standardants. The elements covered in the scope of this method are listed in the table below. Department of Commerce, Gaithersburg, MD Draw the optimum theoretical analytical curve through the plotted points.
The currents are integrated during the exposure time either by charging integrating capacitors and measuring the cumulative voltages at the end of the exposure, or by interrogating the capacitors during the exposure and converting the voltages into digital counts by means of a computer.
Reject all bad burns. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The range shown for each element does not demonstrate the actual usable analytical range for that element. A single standardant for each matrix is preferable, but several may be used. The radiant energies of selected analytical lines and an internal standard line are converted into electrical currents by photomultipliers.
Specific safety and health statements are given in Section Type reference materials are used to adjust the concentrations read from the binary curves in order to report the correct concentrations for specic alloys. Other forms may be analyzed, provided that: To demonstrate compliance with legislated Hg content limits, use of an alternate method capable of analysis with a minimum reporting limit of 0.
An Angstrom is dened as 0. Concentration or concentration ratio plots can be employed. The aluminum specimen to be analyzed may be in the form of a chill cast disk, casting, foil, sheet, plate, extrusion or some other wrought form or shape. This, in turn, may produce concentration readings for silicon that are too high by 0.
Accordingly, to correct for drift, it is essential to select prospective standardants and determine their uniformity before starting the calibration process. This standard does not purport to address all of the safety concerns, if any, associated with its use.
If a computer readout is available, read or print the concentrations directly. See Practice E for precautions to be used in handling gases. If the computer has a graphics feature, use it to plot the curve it has calculated; otherwise, plot manually the curves the computer has calculated to ensure that they are theoretically correct. The specimen shall seal the 8 to 15 mm opening in the top of the excitation chamber. The measuring system may read only intensity ratios voltage ratioswhich then have to be converted into concentrations manually, or the system may use a computer or programmable calculator to convert intensity ratios into concentrations.
During calibration, eight burns of the standardants are recommended. The gas shall be delivered by a ow system as described in Practice E from either high-purity compressed gas, or liquid argon bottles, or from a welding grade supply that has been puried to the required In alloys that are noted for segregation, as many as ve burns may be needed. Flush period, s Preburn period, s Exposure period, s 2 to 7 2 to 10 5 to 20 C Second 2nd indicates that the second order shall be used, where available.
Then burn each calibrant four times. The ow gage need not be incorporated in the system permanently, but may be connected at the outlet temporarily while initiating adjusting the operating ow, and then can be removed.
Each high-frequency wave train is fully rectied, so that the specimen is always the cathode, and only specimen material is introduced into the analytical gap. Two types of standardization are commonly used, as follows 3.
In computer applications, correction is done mathematically by applying a slope and intercept correction, that is, a multiplication to correct the amount of difference between the high and low standardant readings followed by the addition or subtraction of a constant to nally restore readings to expected values.
Your comments are invited either for revision of this standard or for additional standards d1251 should be addressed to ASTM Headquarters. The specimen serves as one electrode, the cathode.
D Background Equivalent—The w1251 at which the signal due to the element is equal to the signal due to the background. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Mercury Hg is intentionally not included in the scope. See Appendix X1 for additional information concerning the acquisition of calibration data.