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EC number: 284-362-7 | CAS number: 84852-49-3
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
(48 h) EC50 7589 mg active acid/L C. tentans (read-across, reliability 2)
(96 h) LC50 >252 mg active acid/L A. tonsa (read-across, reliability 2)
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 7 589 mg/L
Additional information
Freshwater
A reliable 48 h EC50 value of 7589 mg active acid/l has been determined for the effects of DTPMP acid on the mortality of the freshwater insect Chironomus tentans. The organisms is normally used for sediment tests, however since this is an aqueous exposure, the study has been considered in the freshwater aquatic assessment. No water quality data has been presented. Since there were no mortality in the controls and the pattern of mortality appeared regular it can be safely assumed that water quality parameters were within the norm.
No data on short term toxicity of DTPMP-xK salts, CAS 84852-49-3, to freshwater invertebrates are available. However, a reliable 48 h EC50 value of 7589 mg active acid/l has been determined for the effects of DTPMP acid on the mortality of the freshwater chironomid Chironomus tentans.
The results of tests conducted on DTPMP and its salts are directly comparable, because the substance will fully dissociate in solution and the ionisation state will depend only on the pH of the test medium. The counterion is not considered to contribute to effects in fish. At environmentally-relevant pH values, DTPMP will be ionised typically 6-7 times, and will form stable complexes with metal ions.
Here, the value of 7589 mg equivalent active acid/L may be directly read-across.
Marine
No data on short term toxicity of DTPM-xK salts, CAS 84852-49-3, to freshwater invertebrates are available.
A reliable 48 h EC50 value of >252 mg active acid/l has been determined for the effects of DTPMP-xNa on the immobility of the marine copepod Acartia tonsa.
Similarly, as for the freshwater result, the marine active acid result can be converted to the potassium salt equivalent. The pH is said to be ca. 7 so the conversion factor of 1.46 is used to obtain a 96 h LC50 >370 mg/L DTPMPxK
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