This method is for the determination of carbon, hydrogen, and nitrogen in a single instrumental procedure from coal samples using a CHN analyzer. This is often referred to as an "ultimate" analysis. The elements of interest are converted in an oxygen stream to carbon dioxide, water vapor, and nitrogen oxides. Carbon dioxide and water vapor are determined by infrared detection at precise wavelengths on an aliquot of the combustion gases from which halides and sulfur oxides have been removed. Nitrogen is determined by thermal conductivity on a second aliquot additionally treated to reduce all nitrogen oxides to nitrogen and to remove residual oxygen, carbon dioxide and water vapor.
This test method covers the instrumental the determination of carbon in the range of 54.9 % m/m to 84.7 % m/m, hydrogen in the range of 3.25 % m/m to 5.10 % m/m, and nitrogen in the range of 0.57 % m/m to 1.80 % m/m.
No Obligation Quotation for Analytical Services
If you would like us to provide a quote for laboratory analysis, just provide us with as much information as you can about your project (the more, the better) and we'll provide you a quote via email. As you are searching or browsing our Analytical Guide, you'll see the Request-A-Quote icon... just click on it to start the request process.
| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | 4oz glass or plastic bottle with Teflon-lined lid. |
| Collection Method: | Grab sampling |
| Analytical Methodology: | CHN analyzer |
| Documentation: | 
D-5373
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Hydrogen | H2 |
1333-74-0 |
0.5 |
% |
| Carbon | C |
7440-44-0 |
0.5 |
% |
| Nitrogen | N2 |
7727-37-9 |
0.5 |
% |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.