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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

The hazard assessment bases on the equilibrium partitioning method.

Key value for chemical safety assessment

Additional information

It’s worth to mention that some studies on the toxicity towards soil arthropods of DCDPS have been published in the past. Such studies were not taken into consideration to derive the PNEC due to the unrealibility of the results, and for this reason the hazard assessment was determined basing on the EPM method. The mentioned studies don't meet important criteria of today performance and reporting standards, moreover specific information on the test items are lacking as well. A brief summary of the results of such studies is provided below. Deonier et al (1946) report an LC50 to aquatic mosquito larvae (Anopheles quadrimaculatus) between 1 and 0.1mg/L. In these studies DCDPS was tested to animals with chewing mouthparts or in solute form so that is could be orally ingested and thus act via the, i. e. as stomach poison. In other experiments, where test animals with sucking and piercing mouthparts were exposed to dry films of DCDPS, no toxicity to insects (Browning et al 1948, Proverbs & Morrison 1947) or acarids (Metcalf 1948) was observed. This indicates ineffectiveness as contact poison but strong effectiveness as stomach poison, which is in accordance with the considerations of Läuger et al (1944).

References:

Deonier et al (1946) Mosquito larvicide test related DDT compounds. Soap. Sanit. Chem. 22(11)

Browning HC, Fraser FC, Shapiro, SK, Glickman I & Dubrule M (1948). Biological activity of DDT and related compounds. ISSN: 0366-7413, Canadian Journal of Research, Section D: Zoological Sciences 26D:282-300.

Proverbs MD & Morrison FO (1947). Relative insecticidal activities of DDT and related organic molecules. ISSN: 0366-7413, Canadian Journal of Research, Section D: Zoological Sciences 25D:12-41.

Metcalf RL (1948). Acaricidal properties of organic compounds related to DDT. ISSN: 0022-0493, Journal of Economic Entomology 41: 875-82.

Läuger P, Martin H & Müller P (1944). Über Konstitution und toxische Wirkung von natürlichen und neuen synthetischen insektentötenden Stoffen (Constitution and toxic action of natural and new synthetic insecticides) Constitution and toxic action of natural and new synthetic insecticides. Helvetica Chimica Acta 27: 892-928.