Chloride analyses of soil leachate using the TRAACS 800 analyzer
- 1 August 1990
- journal article
- other
- Published by Taylor & Francis in Communications in Soil Science and Plant Analysis
- Vol. 21 (13) , 1689-1693
- https://doi.org/10.1080/00103629009368332
Abstract
Chloride is often used as a tracer element in leaching studies in soils. In many cases the leachate contains colloidal clay and organic coloured substances interfering with the determination of chloride. A dialyzer was used to overcome this interference. Highly coloured plant extracts were analyzed without interference. In this method the sample is mixed with the colour reagent and dialyzed into the colour reagent again. The colour reagents consist of mercuric thiocyanate, methanol, nitric acid and ferric nitrate. The reaction depends on the liberation of thiocyanate ions from mercuric thiocyanate, by reaction with Cl‐ions and the formation of un‐ionized but soluble mercuric chloride. In the presence of ferric ion, the liberated thiocyanate forms highly coloured ferric thiocyanate, the concentration of which is proportional to the original chloride concentration.Keywords
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