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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

One study was available for the soil microbial endpoint (Annex IX, Endpoint 9.4.2 Effects on Soil Microorganisms).  The study by Trocme et al., (1989) presents a long-term carbon transformation test by soil microorganisms in the presence of nonylphenol where a NOEC of 100 mg nonylphenol/kg can be derived.

Key value for chemical safety assessment

Long-term EC10 or NOEC for soil microorganisms:
100 mg/kg soil dw

Additional information

There was one reliable toxicity study relating to soil microorganisms where a 40-day test based on microbial respiration by measuring carbon transformation provided a NOEC of 100 mg nonylphenol/kg (Trocme et al., 1989). This is the Key Study although this result is the only one available. There are some deviations from the standard OECD 217 Guideline but these are not thought to undermine the study. In contrast to the standard test protocol, the test duration is far greater (at 40 days) which would traditionally lead to a more sensitive toxicity value. The fact that there was no evidence of toxicity at 100 mg/kg when compared to the control, suggests that this study is more protective of this endpoint than a standard OECD study. This study indicates that soil microorganisms are less sensitive to nonylphenol than soil invertebrates but may be more sensitive than terrestrial plants.