Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free: https://www.ghostery.com/fr/products/

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site: http://www.youronlinechoices.com/fr/controler-ses-cookies/, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Realytics
Google Analytics
Spoteffects
Optimizely

Targeted advertising cookies

DoubleClick
Mediarithmics

The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at cil-dpo@inra.fr or by post at:

INRA
24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal Logo partenaire logo CARRTEL

Alpine Center for research on trophic networks and limnic ecosystems

UMR CARRTEL

Centre Alpin sur les Réseaux Trophiques et Ecosystèmes Lacustre

Equipment

spectrophometre d'absorption atomique
© INRAE, Atomic absorption spectrophotometer

Atomic absorption spectrophotometer
Elements analyzed: Ca, Mg, Na, K, Fe, Cd, Cu, Zn
The solution is atomized by an air / acetylene flame or an oven, then excited by a lamp of wavelength specific to the element to be analyzed. The quantity of photons absorbed by the atoms is then measured

.

_____________________________________________________________________________________________________________

© INRAE, Ion chromatograph.

Ion chromatograph
Elements analyzed: Cl-, SO42-, NO3-
The elements to be dosed are separated on a column made up of ion exchange resin. Each element appears at a specific time and is quantified using a calibration curve as a function of the area of the peak it forms.

____________________________________________________________________________________________________________

Analyseur de carbone organique et inorganique
© INRAE, Organic and inorganic carbon analyzer

.

Organic and inorganic carbon analyzer
Elements analyzed: COT, CIT
The addition of a strong acid for inorganic carbon and an oxidant for organic carbon releases CO2 which is measured and quantified using an infrared detector.

_____________________________________________________________________________________________________________

Analyseur d'azote total par chimiluminescence
© INRAE,

Chemiluminescence total nitrogen analyzer

Chemiluminescence total nitrogen analyzer
Elements analyzed: Ntot
The sample is injected into a quartz catalyst which is pushed into the oven at 1000 ° C. Everything is burnt and oxidized. After dehydration of the gases and addition of ozone, the nitrogen gas is transformed into an unstable molecule (NO *) which releases photons which are measured using a photoelectric cell.

_____________________________________________________________________________________________________________

  Analyseur séquentiel
© INRAE,

spectrophotometer
continuous flow

.

Sequential spectrophotometric analyzer
Element analyzed: SiO2
The sample and the reagents are mixed in order to obtain a greater or lesser coloration of the sample depending on the concentration of the compound to be assayed. The colorimetric measurement of the absorbance is carried out at the required wavelength.

______________________________________________________________________________________________________________

Analyseur élémentaire CHN

© INRAE, 

CHN elementary analyzer

CHN elementary analyzer
Elements analyzed: Cpart, Npart
The solid sample is placed in a combustion column. The elementary gases thus produced (CO2, NO2, H2O) are separated by chromatography and measured by a catharometric detector (measurement of the thermal conductivity of the gases).

_____________________________________________________________________________________________________________

Sprectrophotomètre d'absorption moléculaire
© INRAE, 

absorption spectrometer
molecular.

IMG_6040

© INRAE, a chlorophyll meter.

Molecular absorption spectrometer
Elements analyzed: NH4 +, PO43-, Ptot, NO2-, chlorophyll a
A color reagent is added to the sample to be analyzed. The absorption is then measured at a specific wavelength of the element to be analyzed. Thanks to the Beer-Lambert law and a calibration curve we determine the concentration of the element in our sample

_____________________________________________________________________________________________________________

  Titrateur automatique
© INRAE, Automatic titrator

Automatic titrator
Elements analyzed: TAC, pH, conductivity
The pH and conductivity are measured using specific probes. For the TAC, an acid-base assay is carried out by plotting the curve pH = f (volume of poured HCl). The automation of this titration allows a precise determination of the equivalence point giving us the TAC.

______________________________________________________________________________________________________________

  titrateur_oxygene
© INRAE, Oxygen titrator

Oxygen titrator
Elements analyzed: O2
During sampling, the oxygen dissolved in the water is fixed with manganese hydroxide. The acidification of the precipitate obtained releases an amount of iodine equivalent to the amount of oxygen in the sample. We then dose the iodine with sodium thiosulfate.

_____________________________________________________________________________________________________________