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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F See footnote E. Access to the power supply shall be permitted only by removing panels which contain safety interlocks or require the use of tools.
The rst two wstm used primarily for relatively simple analytical programs, covering only a few alloy types. Accurate, astk analysis of aluminum, before it is poured from the furnace, can prevent scrapped heats and minimize the cost of expensive alloying metals.
The unidirectional discharge does not attack the counter electrode, so that it can be used for many burns before renishing or replacement is necessary. Two types of standardization e12551 commonly used, as follows 3. Normally standardization will require ten to fteen minutes.
Draw the optimum theoretical analytical curve through the plotted points. For optimum usefulness, several of the calibrants should have concentrations of the other elements that cover the ranges to be expected in the unknown specimens. Originally published as E — The elements covered in the scope of this method are listed in the table below. For specimens with such low concentrations, single point standardization, either with the blank or another specimen, may give more consistent results.
Current edition approved Jan.
E will depend on the specic equipment, and a tradeoff that the individual laboratory selects between speed of analysis and slightly improved precision and accuracy with longer times.
It is the responsibility of the user ashm this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. NOTE 14—It is essential that the operator learns to distinguish between good burns and bad burns, which are usually due to an air leak between the specimen and the top of the excitation chamber or sometimes to air included in a crack in the specimen. Connect the photomultipliers, capacitors, and related measuring system.
Burn the next ve or six calibrants. Argon also may be introduced around the counter electrode, but the ow rate shall not conne the discharge to an area less than 5 mm in diameter, to provide ee1251 sampling of the specimen. Historical Version s – view previous versions of standard. These have been found to give comparable analytical performance.
ASTM E1251 – 17a
Usually the single standardant is a high reference material used to set the gain. This may result in a drop in the intensity of the aluminum internal standard below its normal level, and a corresponding increase in the intensity ratios for the analytical lines. For unknown specimens where usually two burns are used, this means at least four burns of the standardants.
Burn the standardants for the next ve or six calibrants. Procedure for Ee1251 Specimens The lines listed have proven satisfactory for the elements and concentration ranges prescribed in the Scope. Link to Active This link will always route to the current Active version of the standard. Calculate and enter appropriate correction factors in accordance with Astmm E The absence of CN bands provides improved signal to background ratios for some analytical lines and permits the use of other lines.
Repeat the process of burning the standardants, normalizing where appropriate, and burning the next ve or six calibrants, until all calibrants have been burned. Usually ten matrices will encompass all the present commercial aluminum alloys, organized so that one or two standardants are sufficient for each of the matrices described in X1.
Accordingly, to correct for drift, it is essential to select prospective standardants and determine their uniformity before starting the calibration process.
The elements covered in the scope of this method are listed in the table below. Accurate analysis of Hg using this technique is r1251 by the presence of an intense iron interference.
The mass fraction ranges given in the above scope were established through cooperative testing ILS of selected reference materials.
The system also may contain the program circuitry that times the ush, pre-burn and exposure intervals, turns the source on and off, etc.
Calibration may require only 5 to 20 calibrants. C Second 2nd indicates that the second order shall be used, where available. For each major alloy type, the calibration curves are adjusted by burning a type reference material in order to obtain the correct concentrations for various alloys.
To demonstrate compliance with legislated Hg content limits, use of an alternate method capable of analysis with a minimum reporting limit of 0. When a burn is rejected, it may be replaced with another burn in order to maintain the normal number of burns to be averaged.
Standardization for each matrix is similar to that described in X1. 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. A good burn will have a deeply pitted area in the center, surrounded by a blackish astmm, usually wider opposite the argon inlet. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Then burn each calibrant four times. A printout of the analysis is recommended because it provides awtm permanent record and eliminates clerical errors, but display of results on a video scope is acceptable. The specimen shall seal the 8 to ee1251 mm opening in the top of the excitation chamber. This keeps the system as simple as possible and eliminates a possible source of organic contaminants or leaks. Inaccurate reporting of Hg due to these interference effects can jeopardize the current designation of aluminum production as a mercury-free process.
Different but simple curves covering a relatively short concentration range are used for each major alloy. Depending upon the manufacturer, the excitation chamber may require watercooling, or a diaphragm may be inserted in the chamber to occlude any radiation from the hot specimen or the counter electrode, or both may be required. During calibration, eight burns of the standardants are recommended.