Soil chemistry equilibrium as influenced by solution volume and concentration

Wieck, Travis (2012) Soil chemistry equilibrium as influenced by solution volume and concentration. [USQ Project]

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Abstract

The aim of this project was to investigate the effect of Electrical Conductivity (EC) and increasing Pore Volumes (PV) on soils solid and solution chemical equilibrium by analysis of soil leachate.

This is in order to understand:
1. The effect of EC on the rate chemical equilibrium is attained.
2. The number of PV’s required to reach chemical equilibrium in soils with vastly different properties.

Three soils were studied by percolating solutions of varying EC (0.5, 1, 2, 4 and 8 dS/m) through soil cores and collecting the leachate. The leachate was analysed using an AAS for sodium, magnesium and potassium concentrations, along with testing for EC and determining HC.

From experimental investigation, it was observed that increasing the EC of the percolating solution increased the amount of cations replaced in the soil per PV. Furthermore, the rate of ion exchange generally decreases as the number of PV’s increases.

Processes such as exchange models (diffusion or mass transfer), interlayer collapse from 2:1 clays, and macropore preferential flow Vs. micropore flow effects on exchange were considered, but require further investigation.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Supervisors: McLean-Bennett, John
Date Deposited: 27 Feb 2013 00:30
Last Modified: 27 Feb 2013 00:30
Uncontrolled Keywords: soil chemistry; soil leachate; electrical conductivity
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070101 Agricultural Land Management
URI: http://eprints.usq.edu.au/id/eprint/23099

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