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Sediment toxicity

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Description of key information

Call et al., 2001 exposed the freshwater invertebrates Chironomus tentans and Hyalella azteca for 10 days (short-term) to DBP-contaminated sediment. Sediment contained 2.45%, 4.8% and 14.1 %TOC. The 10-d LC50 values for DBP and H. azteca were:17,400. 29,500, and.71,900 mg/kg dry weight for the low, medium, and high TOC sediments, respectively. The 10-d LC50 values for DBP and C. tentans were 826, 1,664, and 4,730 mg/kg dry weight for the low, medium, and high TOC sediments, respectively.
Effects of DBP on macrobenthic animals that colonized sand-filled boxes for 8 weeks in the laboratory and in the field were determined by comparing community structures in boxes that contained uncontaminated and DBP-contaminated sand by Tagatz et al., 1986.
In the exposure (both field and laboratory tests) via sediment (nominal), no significant effects occurred at 100 mg/kg, and echinoderms and molluscs were the only phyla affected at 1000 mg/kg.

Key value for chemical safety assessment

EC50 or LC50 for freshwater sediment:
826 mg/kg sediment dw
EC10, LC10 or NOEC for freshwater sediment:
100 mg/kg sediment dw

Additional information

Based on key studies Call et al., 2001 and Tagatz et al., 1986.

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