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 UB AgroSup CNRS

Home

Veronika STORCK (2016)

Assessment of the environmental fate of pesticides and their ecotoxicological impact on soil microorganisms: the case of chlorpyrifos, isoproturon and tebuconazole

le 5 décembre à 14h00 Salle de Conférences INRA

Pesticides are mainly applied to cultivable soils in agriculture to protect crops from various pests. Only a tiny part of sprayed pesticides ends up in their target organisms, while the rest persists on plants or in soil from where it can disperse to surrounding environments and harm non-target organisms. To minimize environmental damage caused by pesticides, their environmental fate and potential impact on non-target organisms is evaluated in an environmental risk assessment procedure by EU-authorities before their authorization and introduction to the market. The pesticide approval process is criticized for compromising a non-precautionary principle, as numerous formerly used pesticides are now banned due to the late emergence of environmental issues after years of their usage. Especially the formation of pesticide transformation products and the ecotoxicological impact of pesticide residues on soil microorganisms supporting numerous ecosystem functions are not sufficiently evaluated during the environmental risk assessment process.  Within this context, my PhD aimed to support pesticide environmental risk assessment by the application and development of innovative methods of analytical chemistry and molecular biology to study the environmental dissipation (degradation / sorption / transformation) of pesticides in soil and their ecotoxicological impact on soil microorganisms. The three pesticides chlorpyrifos (CHL), isoproturon (IPU) or tebuconazole (TCZ) were chosen to establish lower tier and higher tier pesticide exposure scenarios in lab-to-field experimental designs.  A research highlight of my PhD is the development of a combined approach of suspect screening and molecular typology to detect and classify TCZ transformation products in soil and to estimate their environmental parameters. Moreover, findings of my PhD partly confirmed risk assessment studies, as the lower tier pesticide exposure scenario suggested a low but significant impact of CHL and TCZ (and no impact of IPU) on the soil bacterial composition, estimated by next-generation sequencing of 16S rDNA amplicons. However, in the higher tier pesticide exposure scenario, CHL and TCZ were found to induce significant changes in the microbial activity (evaluated via pesticide mineralization as a proxy for soil buffering functions) and the bacterial diversity (evaluated via next-generation sequencing of 16S rDNA amplicons).  The results of my PhD have the potential to enrich future post-authorization risk assessments of CHL (due in 2020), IPU (due in 2017) and TCZ (due in 2023) with additional findings. In addition, the research of my PhD opens a new door for the enhancement of pesticide environmental risk assessment, especially concerning the methods used to assess the ecotoxicological impact of pesticides on soil microorganisms.