| Abstrakt: |
Soil was pretreated with HCl‐HF solutions prior to organic matter solubilization by an iminodiacetic acid type cation‐exchange resin (Chelex 100). As the normality of HCl‐HF solutions increased from 0.05Nto 0.5N, the identifiable soil mineral content of the extracted organic matter decreased and the inorganic element content increased. Pretreatments with 0.1Nand 0.3NHCl‐0.3NHF solutions resulted in the highest element concentrations in the extracted organic matter, while the 0.5NHCl‐0.5NHF pretreatment resulted in the smallest soil mineral content. Elemental analysis of the ashed organic matter indicated that it had a high affinity for P, Al, Fe, Zn, Cu, and B solubilized by HCl‐HF. Infrared spectra of the extracted material suggested that metal‐organic complexing occurred through electrovalent bonding between ionized carboxyl groups and solubilized inorganic elements and their hydrous oxides. However, analysis of the supernatant from the HCl‐HF pretreatments indicated that most of the solubilized soil elements remained in solution. |
