ASTM E1251 PDF

ASTM E1251 PDF

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June 1, 2020

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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Last previous edition E — 88 e1. If one or more of the standardants do not s1251 these criteria, this is an indication that they are not sufficiently homogeneous.

ASTM E铝和铝合金分析_百度文库

The alloying elements with complex spectra nickel, manganese, iron, s1251, chromium, zirconium, titanium, and vanadium are present at concentrations so low that only the more intense lines can cause interferences. 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 Use one aetm the sets of electrical parameters given in Table 2.

Other forms may be analyzed, provided that 1 they are sufficiently massive to prevent undue heating, 2 they permit machining at surfaces having a minimum diameter of approximately 15 mm, and 3 reference materials of similar metallurgical condition and chemical composition are available. For the values marked with an F, the available data was for a concentration greater than ten times but less than times the expected detection limit.

Adjust the counter electrode to provide an analytical gap of 3.

This standard does not purport to address all of the safety concerns, if any, associated with its use. The computer stores a single curve for each element.

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Equivalent accuracy can be obtained with each method, when properly asttm. 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.

Type reference materials are used to adjust the concentrations read from the binary curves in order to report the correct concentrations for specic alloys. Suitable techniques include but are not limited to glow discharge mass spectrometry, XRF, and cold vapor AA. The specimen shall seal the 8 to 15 mm opening in s1251 top of the excitation chamber.

ASTM E1251 – 17a

A few benchmark Certied Reference Materials are available from the National Institute of Standards and Technology5 and many other reference materials are available commercially in both chill-cast and wrought forms.

Active view current version of standard. If nonmodied specimens are to be analyzed with calibration curves established with modied reference materials or vice versacorrections for such effects shall be applied.

Other forms may be analyzed, provided that: An alternative e12511 electrode, xstm 6. Preparation of Reference Materials and Specimens Cylinders of either compressed argon gas or liquid argon may be employed.

Usually a single high-purity reference material suffices to standardize the low ends of the curves for all elements. 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. The ow gage need not be incorporated in the system permanently, but may be connected at the outlet temporarily while initiating adjusting the axtm ow, and then can be removed.

Specific safety and health statements are given in Section This may result in a drop in the intensity of the aluminum internal standard below its normal level, and a corresponding e11251 in the intensity e1521 for the analytical lines.

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Also, other sample forms can be melted and cast into a disk, using an appropriate mold, as described in Practices E Repeat the process of burning the standardants, normalizing where appropriate, and burning the next ve or six calibrants, until all calibrants have been burned.

NOTE 14—It is essential that the operator learns to distinguish between good burns and bad burns, aztm 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.

Fifty or more binary calibrants may be required for calibration. For each major alloy type, the calibration e12251 are adjusted by burning a type reference material in order to obtain the correct concentrations for various alloys. NOTE 13—Physically cleaning asm counter electrode after each exposure, using a motor-driven wire brush, can prolong the time before a major cleaning or replacement is needed.

NOTE 3—If phosphorus is e125 be measured, the optimum line is A, which is strongly absorbed by oxygen; therefore, a vacuum spectrometer is required, operating at a pressure of 25 microtorr or less. Usually the single standardant is a high reference material used to set the gain.

With such a curve, seriously erroneous analyses may be obtained for unknown specimens with concentrations between the calibrants. A single burn frequently is employed for primary aluminum or for low-concentration alloys, where the specimens usually are homogeneous.