Hello dear Rami.

With GC-MS (tandem MS for some specific compounds) we can get both the qualitative and the quantitative composition of the gas. Of course, this can be more or less troublesome depending on the specific composition. For example, the content of H2S can be a serious issue which for the accuracy of the analysis.

Cheers!

Dear Mário Silva

Thank you for this valuable comment.

Dear, Rami Mahmood Idan.

Please clarify the problem:

1) If you want to find GC methods for analyzing natural gas, then describe exactly what equipment you have. At least: the chromatograph brand, column parameters, detector type.

2) If you have already performed an analysis and now want to interpret the results, then give at least 1 chromatogram.

Dear Maxim Kuzhin,

Thank you for this response. I already have the GC analysis of gas samples, and I want to interpret this analysis. I may need a method to delineate like these searches.

Thanks,

Rami

Dear, Rami Mahmood Idan.

Then in your case, identification is possible by entering individual substances. They will also be needed for quantitative analysis.

Here is an approximate composition of the gases:

Methane ...... 40-99.97% Ethane ......... 0.001-15% Propane ..... 0.001-6.0% Isobutane ....... 0.001-4.0% n-Bhutan ............ 0.001-4.0% Isopentane ........ 0.001-2.0% n-Pentane ......... 0.001-2.0% Neopentane ...... 0.0005-0.05% Hexanes .......... 0.001-1.0% Heptanes ......... 0.001-0.25% Octanes ........... 0.001-0.05% Benzene ............ 0.001-0.05% Toluene ............. 0.001-0.05%

Components not determined by GC-FID: Carbon dioxide ............. 0.005-10.00% Helium .................................... 0,001-0,5% Hydrogen ................................ 0,001-0,5% Oxygen ............................. 0.005-2.0% Nitrogen ....................................... 0,005-15%

I recommend that you familiarize yourself with ISO 6974-1: 2000 - ISO 6974-6: 2001.

Dear Maxim Kuzhin,

I am so grateful for this response and the efforts that you introduced to me.

All gas analysis are normally very complex. Many times a single column may not separate all gas components. Valve operations with column switching is employed for many complex gas analysis. For individual gas identification. you will require authentic standards. Many times it will be difficult also. GCMS can be a better option where you can do both qualitative and quantitative analysis.

Dear Rami,

To evaluate the composition, you have 2 methods: use normalize like ISO or ASTM, or you develop a method from zero. What do you want qualitative or quantitative analysis?

Thank you for this valuable answer. About your question, I want to evaluate both quantity and quality.

@ Imadeddine AZZOUZ