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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Arthur et al (1974) presents 96 hr TL50(or LC50) results of 80 and 115 mg/L Na3NTA for the amphipod, Gammarus pseudolimnaeus.  Tests were conducted according to APHA (1971) Standard Methods 13 ed.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
80 mg/L

Additional information

Arthur et al (1974) presents 96 hr TL50(or LC50) results of 80 and 115 mg/L Na3NTA for the amphipod, Gammarus pseudolimnaeus. Tests were conducted according to APHA (1971) Standard Methods 13 ed. Canton and Slooff (1982) presented a 48 hr LC50 range of 560 -1,000 mg/L but this study was considered not reliable. Weaver (1967) tested adult snails in soft and hard dilution waters with resulting 96hr TLm of 400 ppm for soft water and 560 ppm for hard water.

Arthur et al. (1974) was chosen as key study as it was the most senitive reliable data for short-term toxicity of NTA to freshwater invertebrates.

Table 1. Summary of Short-term Toxicity to Freshwater Invertebrates

 Guideline  Species  Effect Concentration  Reference  Reliability
APHA (1971) Standard Methods 13th ed.  Gammarus pseudolimnaeus  96hr LC50 = 80 and 115 mg/L NTA  Arthur et al. (1974)  2- reliable with restrictions 
 OECD 202  Daphnia magna 48 hr LC50 560 -1000 mg/L Canton and Slooff (1982)  3 - not reliable 
 none available Physa heterostropha   96 hr TLm 400 -560 mg/L  Weaver (1967)  2 -reliable with restrictions