Saturday, 15 July 2006

Behaviors of Layered Double Hydroxides in Soils.

Man Park1, Young Jin Seo2, Choong Lyeal Choi3, Jong Hee Lee4, and Pyoung Yeol Kim4. (1) Dept of Agricultural Chemistry, Kyungpook National Univ, Deagu, 702-701, South Korea, (2) Kyeongsangbukdo Agricultural Technology Administration, 189 Dongho-dong,Bukgu, Deagu, 702-708, South Korea, (3) Kyungpook National University, Dept of Agricultural Chemistry, Deagu, 702-701, South Korea, (4) Kyungpook National Univ, Dept of Agricultural Chemistry, Deagu, 702-701, South Korea

Layered Double Hydroxides (LDHs) exhibit unique properties such as anion exchange capacity, acid lability, and high affinity to ubiquitous carbonate ion. In particular, acid lability and carbonate affinity make LDHs an excellent matrix to carry various agrochemicals because these properties facilitate complete and controlled release of the intercalated agrochemicals along with beneficial effects on many cultivated soils typically developing acidic characteristics. In this study, behaviors of LDHs in soils have been studied for application of LDHs to delivery of agrochemicals. Two types of LDHs, MgAl and CaFe types, were synthesized through coprecipitation route at room temperature. Their effects on the physico-chemical properties of soils and on mobilization of soil elements were examined in detail along with their fate in soils. It was shown that their frameworks were slowly degraded by acid solubilization to neutralize soil acidity as well as to release their components like Mg and Ca cations. This study shows that LDHs could be evolved into the excellent inorganic functional matrixes with high soil compatibility for delivery of various agrochemicals.

Back to 2.5B Interactions between Clays and Organic Matter and Their Impact on Sorption and Availability of Organic Compounds in Soil Environments - Poster
Back to WCSS

Back to The 18th World Congress of Soil Science (July 9-15, 2006)