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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Adjust the counter electrode to provide an analytical gap of 3. When a burn is rejected, it may be replaced with another burn in order to maintain the normal number of awtm to be averaged. NOTE 8—Reference materials and specimens modied with sodium may produce blacker burns with deeper penetration of ast, spark into the surface.

Preparation of Apparatus The range shown for each element does not demonstrate the actual usable analytical range for that element.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of 1e251 standard. 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.

Preparation of Reference Materials and Specimens Other forms may be analyzed, provided that: 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.

This will require only a minute or two. Therefore, the instrument shall be normalized as needed while the calibration data are being generated see Appendix X1.

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ASTM E1251 – 17a

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. Burn the next ve or six calibrants. The excitation chamber shall be provided with a counter electrode holder and with a clamp to hold the specimen rmly against the upper plate. Then some mechanism for single point standardization, such as a calculating board with movable concentration scales, may be used to compensate for instrumental drift.

Manual adjustments are not needed during standardization because gain and background adjustment factors can be calculated automatically. 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.

Xstm — 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 E251 ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

Mercury Hg is intentionally not included in the scope. Equivalent accuracy can be obtained with each method, when properly employed. 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 w1251.

It is not required if less accuracy is acceptable. 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. A single standardant for each matrix is preferable, but several may be used.

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It can be applied to other types of specimens if there are appropriate reference materials, or if the specimens are remelted. C Second 2nd indicates that the second order shall be used, where available.

ASTM E铝和铝合金分析_百度文库

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. The two procedures can give the same precision, accuracy, and detection limits. In routine use, whenever a different alloy type has to be analyzed, a type reference material will be burned and the computer will apply lateral shifts to the standardized curves, appropriate to each element in that alloy. The rst two are used primarily for relatively simple analytical programs, covering only a few alloy types.

Also, other sample forms can be melted and cast into a disk, using an appropriate mold, as described in Practices E NOTE 4—The background equivalents and detection limits listed in Table 1 can be attained with a reciprocal linear dispersion of 5. Accordingly, to correct for drift, it is essential to select prospective standardants and determine their uniformity before starting the calibration process. NOTE 17—Unfortunately, direct readers are usually calibrated shortly after they have been installed in the laboratory.

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. The ratio of P This shall be done initially and as often as necessary thereafter to maintain proper alignment.