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14 February 2017
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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.
The analysis of the total organic carbon (TOUCH) allow the determination of the different types of carbon present to a sample. This analysis of the CO is based on a catalytic oxidation of the sample in 680ºC and the posterior one2 generated through a detector of infrared.
In order to carry out one analyses, put in touch with the responsible for the UEA.
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.
The different types of carbon that contains a sample can be determined:
Total Carbon: In the combustion of the sample two products are obtained: water (that it is vaporised and is eliminated for condensation) and organic and inorganic carbon (that they rust in CO2). This CO2 generated is measured through a detector of non dispersiu infrared (NDIR).
Inorganic Carbon: The inorganic carbon of a sample is determined through the acidification of the sample with phosphoric acid. In this process CO is formed2 that it is analysed by the detector NDIR.
Total Organic Carbon: This is calculated for the difference between the total carbon and the inorganic carbon.
Organic Carbon Not Purgable (NPOC): You show where the contents of inorganic carbon are very superior to the organic one, it is recommended to measure the NPOC. This is obtained from a previous acidification from the sample in order to eliminate all the IC, and a posterior agitation to eliminate all the organic carbon purgable. Then the acidified and agitated sample works in into the tube of combustion where it is rusted generating CO2.
The TOUCH is a fast, accurate and direct measure of the total organic contents of a sample of water, since it does not depend on the state of initial oxidation of the subject area. Some of the applications of this technique are:
The necessary volume of sample for the analysis is 24 mL (filtrates in 0.45 µm).
PARTICIPATION IN TEST OF INTERCOMPARISON
The participation in this essay is a form of measuring the quality of the results through an external evaluation.
They usually take part in it around 15 laboratories of the international area. It consists of the analysis of two samples of continental waters, giving results of the contents of TOUCH.
The STR take part in it since 2022 bringing the value of the TOUCH, always obtaining satisfactory results.
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