The influence of soil organic matter on DNA adsorptions on andosols

Abstract

The influence of soil organic matter on DNA adsorption in andosols was investigated using various andosol samples including hydrogen peroxide (H 2O2)-treated, heated (400°C), and slurry-added soils. Remarkably less DNA was adsorbed in the slurry-added soil than the original soil. The increase in soil organic matter with the addition of slurry had an obvious negative influence on the adsorption. The decrease in organic matter with H2O2 treatment slightly raised DNA adsorption per unit weight. Adsorption maxima estimated from a simple Langmuir equation were higher in the samples removed of organic matter by the H2O 2 treatment and heating at 400°C than in the untreated soil, although surface area was greatly decreased by both treatments. There was no correlation between the total carbon (T-C) content and the estimated DNA adsorption maxima of any of the soil samples. These results suggest little contribution of soil organic matter to DNA adsorption in andosols.