Dicyandiamide Sorption-Desorption Behavior on Soils and Peat HumusEnglish Full Text

ZHANG Hai-Jun, WU Zhi-Jie and ZHOU Qi-Xing Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). .

Abstract: The sorption-desorption behavior of dicyandiamide （DCD） is an important chemical process that affects DCD fate and mobility in soils. Therefore, this study quantified DCD sorption-desorption on a phaeozem （Mollisol）, a burozem （Alfisol）, a soil with organic matter-removed and peat humus using the batch-equilibration procedure, and identified soil properties that influenced DCD sorption. The sorption on peat humus was higher than that on the phaeozem and the burozem, with much lower sorption observed on the soil with organic matter-removed, indicating that soil organic matter was the main carrier of DCD sorption. Due to its amphipathic property the DCD molecule sorption on the phaeozem and the burozem decreased as pH increased from about 2 to 5, but a further increase in pH led to a rise in DCD sorption. The DCD desorption hysteretic effect for peat humus was greater than that for the phaeozem and the burozem using 0.01 mol L-1 CaCl2 as the background electrolyte, suggesting that the hydrophobic domains of organic matter may play an important role in DCD sorption.

Keywords：

dicyandiamide; peat humus; soil; sorption-desorption behavior;

Series：
(D) Agriculture; (B) Chemistry/ Metallurgy/ Environment/ Mine Industry
Subject：
Environment Science and Resources Utilization
Classification Code：
X53

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Dicyandiamide Sorption-Desorption Behavior on Soils and Peat HumusEnglish Full Text

ZHANG Hai-Jun, WU Zhi-Jie and ZHOU Qi-Xing Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). .

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