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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If nonmodied specimens are to be analyzed with calibration curves established with modied reference materials or vice versacorrections for such effects shall be applied. A number in parentheses indicates the year of last reapproval. 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.

They shall be used to NOTE 7—Fortunately with aluminum, there are relatively few interferences because the aluminum spectrum itself and the spectra of the major alloying elements silicon, copper, magnesium, zinc, and tin are simple. Asfm burn each calibrant four times.

This shall be done initially and aastm often as necessary thereafter to maintain proper alignment. The second two are appropriate for more complex analytical programs. Usually they have not yet become as stable as they will be after a month or so, and consequently, the readings obtained may show signicant drift.

Usually the single standardant is a high reference material used to set the gain.

This standard does not purport to address all of the safety concerns, if any, associated with its use. For unknown specimens where usually two burns are used, this means d1251 least four burns of the standardants. The system shall asmt The specimen serves as one electrode, the cathode. Then some mechanism for single point standardization, such as a calculating board with movable concentration scales, may be used to compensate for instrumental drift.

Argon gas shall be e251 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. Other internal standard and analytical lines may be used, provided it is shown that the results obtained are comparable.

ASTM E铝和铝合金分析_百度文库

Cylinders of either compressed argon gas or liquid argon may be employed. NOTE 9—For optimum precision and accuracy, the reference materials and specimens adtm have been freshly machined no longer than 1 h before use, to avoid the formation of aluminum oxide. A single burn frequently is employed for primary aluminum or for low-concentration alloys, where the specimens usually are homogeneous. These have been found to give comparable analytical performance.

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Suitable techniques include but are not limited to glow discharge mass spectrometry, XRF, and cold vapor AA. Calibration may require only 5 to 20 calibrants. The concentration ranges given in the above scope were established through cooperative testing ILS of selected reference materials.

This keeps the system as simple as possible and eliminates a possible source of organic contaminants or leaks. Active view current version of standard. Note 1 The concentration ranges given in the above scope were established through cooperative testing ILS axtm selected reference materials. The excitation chamber shall be enclosed and shall be provided with a safety interlock so that the source cannot be turned on until the door is closed. If a computer readout is available, read or print the concentrations directly.

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 axtm followed by the addition or subtraction of a constant to nally restore readings to expected values. It is the responsibility of the aztm of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

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.

Mercury Hg is intentionally not included in the scope. 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 zstm shape. The elements covered in the scope of this method are listed in the table below.

ASTM E1251 – 17a

Accordingly, to correct for drift, it is essential to select prospective standardants and determine their uniformity before starting the calibration process.

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.

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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. J If phosphorous is to be determined, the most sensitive line appears to be Accurate analysis of Hg using this technique is compromised by the presence of an intense iron interference.

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. NOTE 8—Reference materials and specimens modied with sodium may produce blacker burns with deeper penetration of the spark into the surface.

With a strip chart or X-Y recorder, concentration scales may be preprinted on the paper, as illustrated in Test Method E Type reference materials are used to adjust the concentrations read from the binary curves in order to report the correct concentrations for specic alloys. Alternatively, argon gas of the requisite purity can be produced from a welding grade supply by passing it through a titanium furnace which removes oxygen, nitrogen, water, and oil vapors, and other impurities.

The range shown for each element does not demonstrate the actual usable analytical range for that element. The elements covered in the scope of this method are listed in the table below.

Optimum results are obtained by using as an internal standard a background channel proled off the peak of phosphorous A in the rst order.

Calculation of Results The aluminum specimen to be analyzed may be in the r1251 of a chill cast disk, casting, foil, sheet, plate, extrusion, or some other wrought form or shape. Mercury Hg is intentionally not included in the scope. NOTE 4—The background equivalents and detection limits listed in Table 1 can e12551 attained with a reciprocal linear dispersion of 5.

Equivalent accuracy can be obtained r1251 each method, when properly employed. The computer stores a single curve for each element. 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.