Partitioning of copper and lead between solid and dissolved organic matter a humus soil of the Harz mountains and the resulting bioavailability of the metals

SUHERMAN, Prof. Dr. Endang Tri Wahyuni, M.S

2009 | Tesis | S2 Ilmu Kimia

The study on the partitioning of Cu and Pb between solid and dissolved organic matter in a humus rich soil of the Harz mountains (Stieglitzecke area and Bodebruch area) and the ecotoxicity test using Lepidium sativum for checking bioavailability of the metals has been carried out. The aims of these works are to characterize the soil samples for pH, water content, ash content, total organic carbon, cation exchange capacity and mineral content. The partition of heavy metals was determined by adsorption isotherms tests of the soil samples, and the bioavailabilty result of the metals in Lepidium sativum plant were determined by microwave digestion continued with ICP-OES analysis. The Langmuir adsorption isotherms fit better than the Freundlich adsorption isotherms for the description of the soils adsorption with the adsorption quality of the two Harz soil samples was nearly equal regarding the different ash content. Effects on Lepidium sativum (inhibition of root and hypocotyl growth) increased with increasing Cu and Pb concentrations in the test solutions with Cu was found to be more toxic towards Lepidium sativum than Pb.

Kata Kunci : Partitioning,Adsorption,Lepidium sativum,Ecotoxicity,Bioavailability