Main Content

The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 6119

Koen Lock and Colin R. Janssen; The effect of ageing on the toxicity of zinc for the potworm Enchytraeus albidus. Environmental Pollution 116:289-292, 2002

Reprint

In File

Notes

Different extractable zinc fractions and the ecotoxicity of zinc in Enchytraeus albidus were assessed using freshly spiked artificial soils and spiked soils which had been aged for 8 weeks. Standard artificial Organization for Economic Cooperation and Development (OECD)-soils were aged in four different ways: (1) storing at 20 degrees C; (2) percolation followed by storing at 20 degrees C; (3) alternately heating at 60 degrees C and storing at 20 degrees C; and (4) alternately freezing at -20 degrees C and storing at 20 degrees C. Ageing had no clear influence on the pore water concentration, the water soluble and the calcium chloride extractable fraction of zinc in the artificial soils. Similarly, the 21 days LC50 and the 42 days EC50 (reproduction) for E. albidus were not influenced by the different treatments. This absence of zinc fixation in the artificial soil during ageing was probably due to the use of kaolinite clay in OECD-soil.