ASTM D4239 PDF

By the Authority Vested By Part 5 of the United States Code § (a) and. Part 1 of the Code of Regulations § 51 the attached document has been duly. Buy ASTM D Standard Test Method for Sulfur in the Analysis Sample of Coal and Coke Using High-Temperature Tube Furnace. ASTM D Standard Test Method for Sulfur in the Analysis Sample of Coal and Coke Using High- Temperature Tube Furnace Combustion.

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Verify the instrument calibration prior to analyzing test samples, upon completion of all test samples and as needed to meet quality control requirements. Select two additional reference materials, one approximately at the mid-point of the range and one below the lowest level of sulfur expected. During combustion at temperatures above ?

Analyze the test samples using astj apparatus conditions employed for calibration 8. Originally approved in Permission rights to photocopy the standard may also d44239 secured from the ASTM website www. Use a mass that does not exceed the maximum mass used for instrument calibration and with a sulfur value within the range of the instrument calibration. Twelve laboratories participated in this study. Sulfur is oxidized during the reaction of the sample and WO3.

ASTM D4239 – 17

Supporting data have been? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Use a material with a sulfur value near the mid point of the expected calibration range.

In addition, information for coke was calculated per E using 48 sets of data for 24 coke samples from a commercially available interlaboratory pro? Do not use the reference material for calibration or calibration veri? Weigh to at least the nearest 1 mg and evenly spread the test portion of the reference material into the sample combustion boat 6. Total sulfur as sulfur dioxide is detected on a continuous basis.

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Warning—Tungsten Oxide is a strong oxidizing agent. Select one reference material containing at least as much sulfur as the highest level of sulfur d44239. Other materials that are coal s or coke s with documented traceability to reference material CRM c4239 s or coke s prepared by a national metrology body can also be used. Sulfur dioxide asmt IR energy at a precise wavelength within the Xstm spectrum. The gas stream is passed through a cell in which sulfur dioxide is measured by an infrared IR absorption detector.

Do not regenerate the absorbent. Position the sample in the hot zone of the furnace until the instrument returns to baseline as indicated according to settings recommended by the manufacturer.

If the value determined for each reference material employed for veri? The gas stream is then passed through a cell in which sulfur dioxide is measured by an infrared IR absorption detector.

Repeat all samples analyzed since the last successful calibration veri? This standard has been approved for use by agencies of the Department of Defense. Energy is absorbed as the gas passes through the cell body in 3 Available from International Organization for Standardization ISO1, ch. Only use material s with an assigned value and assigned uncertainty for sulfur.

Current edition approved Feb. Users of this standard are expressly advised that determination of the validity of any such dd4239 rights, and the risk of infringement of such rights, are entirely their own responsibility.

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Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

A number in parentheses indicates the year of last reapproval. Thus, the absorption of IR energy can be attributed only to sulfur dioxide whose concentration is proportional to the change in energy at the detector. Use a mass of material and the calibration procedure recommended by the apparatus manufacturer. It is normally heated electrically using resistance rods, a resistance wire, or molybdenum disilicide elements.

ASTM D高温燃烧方式测定煤及焦碳中硫含量的标准实验方法_百度文库

The cokes used asym this study included furnace coke, foundry coke and coke breeze. The remaining material can be used for instrument conditioning. No other xstm of measurement are included in this standard. Do not allow contact with organic materials or reducing agents. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

C, the sulfur and sulfur compounds contained in the sample are decomposed and oxidized almost exclusively to gaseous sulfur dioxide, SO2. Use at least three such reference materials, ast, each range of sulfur values to be tested. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Moisture and particulates are removed from the gas by?