The university is 30 years old. Discover its past and present. Help build its future.
14 February 2017
Find out about bachelor's degrees, postgraduate courses and all the educational courses offered by the UdG.
Teaching is concentrated in the faculties and schools, and the departments deal with research, which is also conducted by institutes and chairs, at the same time responsible for knowledge promotion.
It chromatography of gases it is a technique where the sample is in gas phase or volatilises once injected. The sample is transported to a chromatographic column through a carrying gas (mobile phase). It is a technique of great importance since I allow sorting out, detecting i quantifying mixtures of a great amount of compounds through the time of retention and the area of the pikes.
The chromatography of gases with detector of flame ionisation (GC-FID) allow sorting out, detecting i quantifying mixtures of products volatile or semivolatile. The detector FID is selective for molecules with links C-H in its chemical structure. As practically all the substances that are analysed by gases are organic, the detector FID is almost universal.
The chromatography of gases with detector of thermal conductivity (GC-TCD) allow sorting out, to detect i quantifying mixtures of inorganic gases and small molecules of hydrocarbons.
In order to carry out one analyses, put in touch with the responsible for the UEA.
In the case of the samples that are wanted to analyse through the detector FID, all the components of the mixture have to be volatile at the temperature of the injector (300ºC, approx.), except that the sample wants to analyse using the technique of space in head.
In the case of the samples that are wanted to analyse through the detector TCD, it be necessary that they are in gas phase to room temperature.
It be necessary to inform of the toxicity and precautions of storage of the sample. Once the report has been given, if people do not come to search the remainder of the sample after a week, this will be destroyed.
Equipped with two types of detector: a FID and a TCD.
The team has a selfsampler for the injection of liquid samples of 50 positions.
The injection of gas samples is made in a manual way, using a tight gas syringe.
The team has a selfsampler for the injection of liquid samples of 16 positions.
The chromatography of gases is a technique where the sample, once injected, volatilises and is transported to a chromatographic column through a carrying gas (mobile phase). The carrying gas is an inert gas that does not react with the molecules of the anàlit, but only transports it through the column.
The chromatographic column is filled with a stationary phase, which gave the anàlits of interest of the sample. The choice of the suitable stationary phase for each type of anàlits is an essential factor in the chromatography of gases.
Due to the selective retention of the anàlits to the stationary phase of the column, these come out of the column separately. At the exit of the column, these pass through a detector that gives an answer in the form of signal, and allow its quantification.
The FID it is a very versatile detector.
En el cas del cromatògraf 7890A, la columna instal·lada és la DB-FFAP d’Agilent J&W (30m x 0,32mm, 0.50 µm), que permet la detecció d’àcids grassos volàtils i alcohols en mostres líquides.
In particular, the analysed compounds are:
The volume of sample necessary for the analysis is 2 mL of sample filtered in 0.2 µm.
In the case of the chromatograph 7820th, two capillary columns are had for determination of different compounds:
The TCD he uses itself for the analysis of gas samples. The analysis is made with double column packed (PPU and MS5A) and allow the detection of permanent gases in gas samples.
In particular:
The volume of sample necessary for the analysis is 5 mL.
Choose which types of cookies you accept which the University of Girona can store in your browser.
Those that are essential for enabling your connection. There is no option for disabling them, as they are necessary for the functioning of the website.
These enable your options to be remembered (for example language or region you are accessing from), to provide you with advanced services.
They provide statistical information and enable improved services. We use Google Analytics cookies which you can deactivate by installing this plugin.
To offer advertising contents relating to the interests of users, either directly, or through third parties (“adservers”). These must be activated if you wish to see the YouTube videos uploaded to the University of Girona’s website.
The University of Girona website uses its own and third-party cookies for technical and analytical purposes. To manage them use the manager. If you would like further information, please access our Cookies Policy.