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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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. The system also may contain the program circuitry that times the ush, pre-burn and exposure intervals, turns the source on and e1215, etc.

ASTM E铝和铝合金分析_百度文库

Suitable techniques include but are not limited to glow discharge mass spectrometry, XRF, and cold vapor AA. It employs an analytical curve for each element that covers a relatively limited concentration range. This shall be done initially and as often as necessary thereafter to maintain proper alignment. Each matrix is calibrated as in X1. 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.

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.

Inaccurate reporting of Hg due to these interference effects can jeopardize the current designation of aluminum production as a mercury-free process. Link to Active This link will always route to the current Active version of the standard. Summary of Test Method 4.

Originally published as E — 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.

The wavelength coverage must include the analytical lines required for the needed concentration ranges, as listed in Table 1. Other forms may be analyzed, provided that: If the analytical interest is just in low concentrations near the detection limit, a low standardant is used and either a gain or a background control may be adjusted. Aztm 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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Procedure for Analyzing Specimens F See footnote E. 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. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability e151 regulatory limitations prior to use.

With a strip chart or X-Y recorder, concentration scales may be preprinted on the paper, as illustrated r1251 Test Method E Argon gas shall be introduced just inside the fused quartz window, owing toward the sstm, to prevent any of the metal powder produced at the discharge from coating the inside of the window.

This standard is subject to revision at any astn by the responsible technical committee and must be reviewed every ve years and if e12511 revised, either reapproved or withdrawn.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. X 5 the average of the individual measurements. To demonstrate compliance with legislated Hg content limits, use of an alternate method capable of analysis with a minimum reporting limit of 0. The concentration ranges given asrm the above scope were established through cooperative testing ILS of selected reference materials.

Manual adjustments are not needed during standardization because gain and background adjustment factors can be calculated automatically. The concentration ranges given in the above scope were established through cooperative testing ILS of selected reference materials.

Refer to Practices E and E for guidance. See Appendix X1 for additional information e1215 the acquisition of calibration data. E In this test method, the detection limit was measured by calculating the standard deviation of ten concentration printouts of a specimen between three and ten times the expected detection limit. 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.

A number in parentheses indicates the year of last reapproval. The copper tubing shall be kept as short as possible—preferably only a few feet.

Normally standardization will require ten to fteen minutes.

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.

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However, if at any time the gain adjustment of any channel drops below 0.

The range shown for each element does not demonstrate the actual usable analytical range for that element. Even with this compensation for variability in background, alloys with highly different compositions of major alloying elements, particularly silicon, require separate reference materials and analytical curves.

E — 94 Reapproved Standard Test Method for Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Argon Atmosphere, Point-to-Plane, Unipolar Self-Initiating Capacitor Discharge1 This standard is issued under the xed designation E ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

NOTE 12—Modern direct-reading spectrometers should show little drift in the response of channels with time. The data are based on ten successive readings. C Second 2nd indicates that the second order shall be used, where available. Flush period, s Preburn period, s Exposure period, s 2 to 7 2 to 10 5 to 20 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 to 15 mm opening in the top of the excitation chamber. Specific safety and health statements are given in Section The system shall include: In alloys that are noted for segregation, as many as ve burns may be needed.

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

ASTM E1251 – 17a

NOTE 4—The background equivalents and detection limits listed in Table 1 can aztm attained with a reciprocal linear dispersion of 5. The computer applies the displacement appropriate to that alloy over the relatively short portion of the overall calibration curve that will be used. The lines listed have proven satisfactory for the elements and concentration ranges prescribed in the Scope.