Gas chromatography system and method

A gas chromatography system configured to work selectively in a retaining mode and in an evaporation mode, comprising:

• a tube (2) comprising a retaining part (3), said tube (2) having at least one first inlet part (21) and one second inlet part (22) located such that said retaining part (3) is located between said first inlet part (21) and said second inlet part (22) such that a fluid sample passing from said first inlet part (21) to said second inlet part (22) traverses said retaining part (3);
• a first gas supply subsystem (6) connected to said first inlet part (21) to supply, in a controlled manner, a gas to said first inlet part, such that said gas enters the tube (2) through said first inlet part (21);
• a second gas supply subsystem (7) connected to said second inlet part (22) to supply, in a controlled manner, a gas to said second inlet part (22), such that said gas enters the tube (2) through said second inlet part (22);
• at least one sample introduction duct (101) connected to said first inlet part (21) to introduce the sample in the tube (2) through said first inlet part (21);
• an evacuation duct (9) connected to said second inlet part (22) to evacuate a part of the sample;
• a temperature control subsystem (200) configured to regulate the temperature of the retaining part (3);
• the system additionally comprising at least one gas chromatography column (300);
• wherein
• said gas chromatography column (300) is connected to said second inlet part (22) to receive a gas coming from the retaining part (3) of the tube (2),
• and wherein
• an end (9a) of the evacuation duct (9) penetrates into the tube (2) and is located at a first distance from the retaining part (3), and an end (300a) of the gas chromatography column (300) penetrates into the tube (2) and is located at a second distance from said retaining area (3), said second distance being greater than said first distance.