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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In alloys that are noted for segregation, as many as ve burns may be needed.

This standard does not purport to address all of the safety concerns, if any, associated with its use. Standardization may be possible with one or two reference materials of the highest concentration alloy which have the major elements near the top of their range and the minor and trace elements near or above the middle of their normal ranges.

Accurate, high-speed analysis of aluminum, before it is poured from the furnace, can prevent scrapped heats and minimize the cost of expensive alloying metals. 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.

NOTE 12—Modern direct-reading spectrometers should show little drift in the response of channels with time. NOTE 6—A magnesium furnace is not acceptable because it will introduce variable magnesium contamination. 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 adequate sampling of the specimen. If a computer readout is available, read or print the concentrations directly.

The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item s1251 in this standard. The usable analytical range may be extended higher or lower based on individual instrument capability, spectral characteristics of the specific element wavelength being used and the availability of appropriate reference materials. Then burn each calibrant four times. 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 qstm the top of the excitation chamber or sometimes to air included in a crack in the specimen.

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Note 5 NOTE 5—The gain and zero controls can be omitted if the analytical program is restricted to a few alloy types, the concentration ranges in each are restricted, and the gain and background levels do not vary widely from day to day.

Optimum results are obtained by using as an internal standard a background channel proled off the peak of phosphorous A in the rst order. Active view current version of standard. Inaccurate reporting of Hg due to these interference effects can jeopardize the current designation of aluminum production as a mercury-free process.

Standardization is practiced customarily at the start of each new shift or operatorastn several high reference materials that between them cover the high ranges for all elements. The concentrations should be fairly evenly spaced over the anticipated analytical range, to establish a statistically sound smooth curve through all points.

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. 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 A printout of the analysis is recommended because it provides a permanent record and eliminates clerical errors, but display of results on a video scope is acceptable.

Calculate and enter appropriate correction factors in accordance with Practice E To demonstrate compliance with legislated Hg content limits, use of an alternate method capable of analysis with a minimum reporting limit of 0. The usable analytical range may be aatm higher or lower based on individual instrument capability, spectral characteristics of the specific element wavelength being used, and the availability of appropriate reference materials.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Useful analytical lines with improved signal to background ratios due to the complete removal of C-N background by the argon atmosphere.

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F See footnote E. The two procedures can give the same precision, accuracy, and detection limits.

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For unknown specimens where usually two burns are used, this means at least four burns of the standardants. 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.

It employs an analytical curve for each element that covers a relatively limited concentration range. D Background Equivalent—The concentration at which the signal due to the element is equal to the signal due to the background. For standardization, several reference materials are employed to ensure that the high ends of each calibration curve will be returned to their original readings, and a single high-purity reference material is used to set the low ends of the curves.

The radiant energies of selected analytical lines and an internal standard line are converted into electrical currents by photomultipliers.

ASTM E1251 – 17a

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A single burn frequently is employed for primary aluminum or for low-concentration alloys, where the specimens usually are homogeneous. Different but simple curves covering a relatively short concentration range are used for each major alloy.

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. Accurate analysis of Hg using this technique is compromised by the presence of an intense iron interference. Last previous edition E — 88 e1. The lines listed have proven satisfactory for the elements and concentration ranges prescribed in the Scope. Each matrix is calibrated as in X1.