> For the complete documentation index, see [llms.txt](https://rhizobiome.gitbook.io/eiwa-shop-supports-et-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://rhizobiome.gitbook.io/eiwa-shop-supports-et-documentation/les-protocoles-sante-du-sol/membranes-echangeuses-dions/principe-experimental.md).

# Principe expérimental

Les membranes échangeuses d'ions vont permettre d'adsorber les ions présents dans la solution du sol. Leur désorption permettra ensuite de les doser.

Quatre étapes vont se succéder:

1. saturer la membrane d’ions. 
2. enfouir la membrane saturée dans le sol 2 à 3 semaines. Durant ce temps la membrane cherchera à s’équilibrer avec la solution du sol en adsorbant des ions à sa surface. 
3. retirer la membrane du sol et désorber les ions adsorbés dans une solution concentrée de KCl. 
4. doser les ions nitrates (NO3-) et ammonium (NH4+) en solution.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://rhizobiome.gitbook.io/eiwa-shop-supports-et-documentation/les-protocoles-sante-du-sol/membranes-echangeuses-dions/principe-experimental.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `build a script that syncs our docs to a CMS` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.