ASTM D4239 PDF

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A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. Scope 1. No other units of measurement are included in this standard.

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. Referenced Documents 2. Summary of Test Method 3.

During combustion at temperatures above ? C, the sulfur and sulfur compounds contained in the sample are decomposed and oxidized almost exclusively to gaseous sulfur dioxide, SO2. Moisture and particulates are removed from the gas by? The gas stream is passed through a cell in which sulfur dioxide is measured by an infrared IR absorption detector.

Sulfur dioxide absorbs IR energy at a precise wavelength within the IR spectrum. Energy is absorbed as the gas passes through the cell body in which the IR energy is being transmitted: thus, at the detector, less energy is received. All other IR energy is eliminated from reaching the detector by a precise wavelength? 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.

One cell is used as both a reference and a measurement chamber. Total sulfur as sulfur dioxide is detected on a continuous basis. Sulfur is oxidized during the reaction of the sample and WO3. Moisture and particulates are removed from the combustion gas by? The gas stream is then passed through a cell in which sulfur dioxide is measured by an infrared IR absorption detector.

Energy is absorbed as the gas passes through the cell body in 3 Available from International Organization for Standardization ISO , 1, ch. Current edition approved Feb. Published February Originally approved in Last previous edition approved in as D — DOI: Sample 5. It is normally heated electrically using resistance rods, a resistance wire, or molybdenum disilicide elements.

It is normally heated electrically using resistance wire. Reagents 7. Unless otherwise indicated, it is intended that all reagents conform to the speci? Do not regenerate the absorbent.

Do not allow contact with organic materials or reducing agents. Warning—Pure oxygen vigorously accelerates combustion. Verify all regulators, lines, and valves are free of grease and oil. Other materials that are coal s or coke s with documented traceability to reference material CRM coal s or coke s prepared by a national metrology body can also be used. Only use material s with an assigned value and assigned uncertainty for sulfur.

The uncertainty expressed as the con? Do not use the reference material for calibration or calibration veri? The remaining material can be used for instrument conditioning. Warning—Tungsten Oxide is a strong oxidizing agent. Procedure 8. Pharmacopeial Convention, Inc. Use at least three such reference materials, for each range of sulfur values to be tested. Select one reference material containing at least as much sulfur as the highest level of sulfur expected. Select two additional reference materials, one approximately at the mid-point of the range and one below the lowest level of sulfur expected.

Use a material with a sulfur value near the mid point of the expected calibration range. Use a mass of material and the calibration procedure recommended by the apparatus manufacturer. Weigh to at least the nearest 1 mg and evenly spread the test portion of the reference material into the sample combustion boat 6. 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 analysis time exceeds the maximum analysis time recommended by the manufacturer take corrective action as recommended by the manufacturer. Verify the instrument calibration prior to analyzing test samples, upon completion of all test samples and as needed to meet quality control requirements. Analyze a test portion of reference material s 7. B Where X is the average of two single test results. Calculation to Other Bases 9. Report Precision and Bias Twelve laboratories participated in this study.

Supporting data have been? In addition, information for coke was calculated per E using 48 sets of data for 24 coke samples from a commercially available interlaboratory pro? The cokes used in this study included furnace coke, foundry coke and coke breeze. 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.

If the value determined for each reference material employed for veri? Repeat all samples analyzed since the last successful calibration veri? Weigh a mass of the sample to at least the nearest 1 mg and not exceeding the maximum mass of reference material s used for calibration. Analyze the test samples using the apparatus conditions employed for calibration 8. Analyze the test samples using the apparatus conditions employed for calibration.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. Scope 1. No other units of measurement are included in this standard.

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ASTM D4239 - 18e1

The values given in parentheses after SI units are provided for information only and are not considered standard. 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. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Learn more about the cookies we use and how to change your settings.

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