⁶⁰Coおよび²⁴¹Amと錯形成する腐植物質の分子サイズと官能基

抄録

The effects of molecular size of humic acid (HA) on the interaction affinity with ⁶⁰Co and ²⁴¹Am have been examined with respect to different molecular size fractions which were isolated from the Aldrich Chemical's HA into 5000-30000, 30000 -100000 and >100 000 in molecular weight (MW), while the functional groups of the molecular size fractions have been characterized with respect to their FTIR spectral characteristics.
The HA of >100000 MW which was dominated with aliphatic functional groups did not take part in the interaction with ⁶⁰Co and ²⁴¹Am. The HA of 30000-100000 MW was dominated with both aromatic COOH and phenolic OH, and it perferentially interacted with ⁶⁰Co and ²⁴¹Am. However, ²⁴¹Am did not interact with the HA of 5000-30000 MW which was mainly dominated with aromatic COON, while ⁶⁰Co interacted. Such effects of molecular size of HA may be caused by more than two different functional groups concerning to the complexation and/or steric hindrance around the functional groups.