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Capacity, selectivity, and reversibility for nitrate exchange of a layered double‐hydroxide (LDH) mineral in simulated soil solutions and in soil
Author(s) -
TorresDorante Luis Omar,
Lammel Joachim,
Kuhlmann Hermann,
Witzke Thomas,
Olfs HansWerner
Publication year - 2008
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.200700330
Subject(s) - nitrate , chemistry , hydroxide , leaching (pedology) , adsorption , soil water , ion exchange , inorganic chemistry , cation exchange capacity , aqueous solution , chloride , environmental chemistry , soil science , ion , geology , organic chemistry
The leaching of nitrate is an important way of N losses from agricultural soils in humid regions. Nitrate leaching is difficult to control as most soils under crop production do not have anion‐exchange properties, and nitrate remains mobile in the solution. The present work evaluated the potential use of a synthetic layered double‐hydroxide (LDH) mineral as a nitrate exchanger in soil. The LDH used was a chloride form of a magnesium‐aluminum layered double hydroxide with the formula: [Mg 2+ 0.82 Al 3+ 0.18 (OH) 2 ] 0.18+ [(Cl – ) 0.18 0.5(H 2 O)] 0.18– . Experiments were carried out in aqueous solutions as well as in soil with the following objectives: (1) to characterize the nitrate adsorption capacity on the LDH, (2) to study its selectivity for nitrate adsorption in solution, (3) to evaluate the reversibility for nitrate exchange, and (4) to study the nitrate adsorption capacity and nitrate diffusion towards the LDH in soil.