During an adsorption kinetics experiment, I observed that silicon adsorption in the soil started to decrease sharply after the first 30 minutes. I applied a 0.05 M NaCl solution containing 60 mg L⁻¹ of silicon to 1 g of soil, using sodium silicate and adjusting the pH to 5.5.
Do you use dry soil? Maybe within the first 30 minutes, the soil is wetted and the adsorption takes places, but after 30 minuntes the wetting is not finished. So the wetting goes on, which means: water "dissapears" due to further wetting. This will increase the concentration of silicon in the bulk phase. So, you do not see a desorption but an onconcentration of silicon.
Just an idea....
Several factors could contribute to this particular issue;
when affinity of the silicon is high for the soil surface, it can attribute to rapid adsorption. And you can check the soil composition because it can also alter the adsorption lastly pH level of the silicon.
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