Comparative Toxicity Responses in Earthworms Lumbricus Terrestris and Eisenia Foetida to Cadmium Nitrate and Chlordane Using Artificial Soil and Filter Paper Exposures

• Main Author: Muratti Ortiz, Joseph F.
• Other Authors: Fitzpatrick, Lloyd C.
• Format: Others
• Language: English
• Published: University of North Texas 1992
• Subjects: LC50; LD50; earthworms; cadmium nitrate; chlordane; Cadmium > Toxicology.; Chlordan > Toxicology.
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc500857/

This research compares LC50 and LD50 of earthworms, Lumbricus terrestris and Eisenia foetida exposed to cadmium nitrate and chlordane using 48-h contact filter paper (FP) and 14-d artificial soil (AS) protocols. Both LC50 and LD50 showed that chlordane was more toxic than cadmium in both species regardless of the exposure. The reference toxicant 2-chloroacetamide using the standardized 48-h FP exposure was used to assess the general response of the earthworm prior to toxicity experiments. A glucose test was developed as an internal standard to assess homogeneity of mixtures among both replicates and dilutions. Accuracy of dilutions is assessed by the slope of a regression line relating nominal dilution to observed internal standard concentration. Precision of replicate preparation is assessed by among replicate variance.