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Short-term toxicity data are available with the registered substance or a closely related substance with fish and invertebrates. A 14 d and a 96 h LC50 value of 250 mg/L as EDTMP active acid have been determined with Onychorhyncuss mykiss and Cyprinodon variergatus respectively. During the 14 d study with EDTMP acid and O. mykiss a NOEC value of 114 mg/L as active acid was also determined.

Data are available with inverterbrates indicating 48 h and a 96 h EC50 values of 510 and >310 mg/L as active acid with Daphnia magna and Chaetogammarus marinus respectively in studies conducted with EDTMP acid and EDTMP xCa xNa respectively.

No long-term data are available with the substance, however these are not required according to the Chemical Safety Assessment, i.e. RCRs <1.

A reliable study, performed with a Na salt of EDTMP, is available. The EC50 to WWTP micro-organisms was determined to be >100 mg/l as active acid.

The results of tests conducted on EDTMP and its salts are directly comparable, because the ionisation state will depend only on the pH of the test medium. The calcium and sodium counterions are not considered to contribute to effects in aquatic organisms. EDTMP will be ionised typically 6 or 7 times at environmentally-relevant pH valuesand will form stable complexes with metal ions.

In dilute aqueous conditions of defined pH, a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present, and will be fully dissociated to yield EDTMP acid and calcium (Ca2+) and sodium (Na+). Hence some properties (measured or expressed in aqueous media) for a salt can be directly read across (with suitable mass correction) to the parent acid and vice versa (see Section 1.4 for mass correction values). In the present context the effect of the alkaline metal counter-ion (sodium and calcium) will not be significant and has been extensively discussed in the public literature. In biological systems and the environment, EDTMP will be ionised typically 6 or 7 times. In addition, polyvalent metal ions will be present, and the phosphonate ions show very strong affinity to them.

No long-term data are available with any of the substances registered in this category, however, these are not required according to the Chemical Safety Assessment, i.e. RCRs <1.

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