# To what extent does water content next to preferential flow paths influence colloid retention in structured soils

Eric Michel, Romain van den Bogaert, Loys Mesnier, Sophie Cornu

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## To cite this version:

Eric Michel, Romain van den Bogaert, Loys Mesnier, Sophie Cornu. To what extent does water content next to preferential flow paths influence colloid retention in structured soils. International symposium 2014 of german priority programme SPP 1315 on biogeochemical interfaces in soil - toward a comprehensive and mechanistic understanding of soil functions., Oct 2014, Leipzig, Germany. hal-01601547

HAL Id: hal-01601547

https://hal.science/hal-01601547

Submitted on 5 Jun 2020

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# To what extent does water content next to preferential flow path influence colloid retention in structured soils?

R. Van den Bogaert (1,2,3), E. Michel (1,2), L. Mesnier (1,2), S. Cornu (3)

(1)INRA, Avignon, France (2)Avignon University, France, (3)INRA, Aix en Provence, France

## 1- Colloid fate in soil impacts...

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Water quality

Soil evolution

predictive models of
particle fate

↑ better understanding of mobilization & retention mechanisms

## 2- Successive rainfalls on undisturbed soil cores

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Flow cytometry

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Sample

Hydrodynamic
Focussing

Fluorescence

Light scattering

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FL 1 [a.u.]

## 3 - Duration of rain interruption affects:

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microsphere
retention
(% injected)

natural soil
particle
mobilization
(mg)

## 4- Microspheres from rain *n* recovered at rain *n+1* and *n+2*

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## 5- Microspheres are eluted adsorbed to soil colloids

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## 6-Proposed mechanisms

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