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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The concentration ranges given in the above scope were established through cooperative testing ILS of selected reference materials. The argon, with most of the metal dust, shall be exhausted to the atmosphere from the back or side of the chamber. A single standardant is employed for each alloy type, with a composition near the normal or target concentrations for all elements. The concentration ranges given in the above scope were established through cooperative testing ILS of selected reference materials.

A bad burn will have shallow pittings, surrounded by a whitish or silvery ring. The aluminum specimen to be analyzed may be in the form of a awtm 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. Link to Active This link will always route to the current Active version of the standard.

Calculation of Results D Background Equivalent—The concentration at which the signal due to the ast, is equal to the signal due to the background.

e1521 Different but simple curves covering a relatively short concentration range are used for each major alloy. These reference materials can be used for establishing an analytical curve, but will not reveal potential interferences from nearby lines of other elements, or matrix effects that change the background or response.

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BoxEvergreen, CO 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. Standardization is practiced customarily at the start of each new shift or operatorusing several high reference materials that between them cover the high ranges for all elements.

Calibration may require only 5 to 20 calibrants. The system also may contain the program circuitry that times the ush, pre-burn and exposure intervals, turns the source on and off, etc.

ASTM E1251 – 17a

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 zstm a computer. NOTE 17—Unfortunately, direct readers are usually calibrated shortly after they have been installed in the laboratory. NOTE 1—All-metal connections are required because the discharge is adversely affected by organic contamination, or by as little as 2 ppm of oxygen or a few ppm of water vapor.

Reject all bad burns. The two procedures can give the same precision, accuracy, and detection limits. Concentration or concentration ratio plots can be employed.

ASTM E铝和铝合金分析_百度文库

Mercury Hg e11251 intentionally not included in the scope. R1251 period, s Preburn period, s Exposure period, s 2 to 7 2 to 10 5 to 20 A number in parentheses indicates the year of last reapproval.

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The computer may have calculated a curve that weaves in and out between the points for the calibrants. Usually the single standardant is a high reference material used to set the gain. Note 1 The concentration ranges given in the above scope were established ee1251 cooperative testing ILS of selected reference materials.

Standardization becomes a short and simple process. The range shown for each element does not demonstrate the actual usable analytical range for that element. It can be applied to other types of specimens if there are appropriate reference materials, or if the specimens are remelted.

The specimen shall seal the 8 asstm 15 mm opening in the top of the excitation chamber. However, it should be noted that some elements for example, magnesium readily form oxides, while some others for example, sodium, lithium, calcium, and strontium are volatile, and may be lost to varying degrees during the melting process.

The lines listed have proven satisfactory for the elements and concentration ranges prescribed in the Scope. Asttm superscript epsilon e indicates an editorial change since the last revision or reapproval. The process of calibration will probably take several days.

NOTE 13—Physically cleaning the counter electrode after each exposure, using a motor-driven wire brush, can prolong the time before a major cleaning or replacement is needed.