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Description of key information

The oral LD50 value is in excess of 2000 mg/kg bw; the 4-h LC50 value of structurally related substances is in excess of 5 g/m3. No acute dermal toxicity studies are available but based on read across (see also section 13), acute dermal toxicity following exposure to DTPA-Fe(NH4)2 is not expected.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October-November 2012
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
GLP compliance:
yes (incl. QA statement)
Test type:
acute toxic class method
Limit test:
Details on test animals or test system and environmental conditions:
Species: rat, Wistar strain Crl:WI (Han) (outbred, SPF-Quality). Recognized by international guidelines as the recommended test system (e.g. OECD, EC) Source: Charles River Deutschland, Sulzfeld, Germany.
Number of animals: 6 Females (nulliparous and non-pregnant). Each dose group consisted of 3 animals.
Age and body weight: Young adult animals (approx. 9 weeks old) were selected. Body weight variation did not exceed +/- 20% of the sex mean.
Identification: Ear- and tailmark

Environmental controls for the animal room were set to maintain 18 to 24°C, a relative humidity of 40 to 70%, approximately 15 room air changes/hour, and a 12-hour light/12-hour dark cycle. Any variations to these conditions were maintained in the raw data and had no effect on the outcome of the study.

Group housing of 3 animals per cage in labeled Makrolon cages (MIV type; height 18 cm.) containing sterilized sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France) and paper as cage-enrichment (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom).
Acclimatization period was at least 5 days before start of treatment under laboratory conditions.

Free access to pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany).

Free access to tap water.

Diet, water, bedding and cage enrichment evaluation for contaminants and/or nutrients was performed according to facility standard procedures.
Route of administration:
oral: gavage
unchanged (no vehicle)
Details on oral exposure:
Method: oral gavage, using plastic feeding tubes.
Fasting: animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test substance. Water was available ad libitum.
Frequency: single dosage on Day 1.
Dose level (volume): 2.95 ml/kg bw .Dose volume calculated as (dose level (g/kg) / density (g/mL)) x 1.89 (A correction was made for purity of the test substance (correction factor 1.89)).

2000 mg/kg bw
No. of animals per sex per dose:
Control animals:
Details on study design:
Mortality/Viability: twice daily.
Body weights: days 1 (pre-administration), 8 and 15.
Clinical signs: at periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15. The symptoms were graded according to fixed scales and the time of onset, degree and duration were recorded:
Maximum grade 4: grading slight (1) to very severe (4)
Maximum grade 3: grading slight (1) to severe (3)
Maximum grade 1: presence is scored (1).
Necropsy: at the end of the observation period, all animals were sacrificed by oxygen/carbon dioxide procedure and subjected to necropsy. Descriptions of all internal macroscopic abnormalities were recorded.
Not needed, limit test
Dose descriptor:
Effect level:
> 2 000 mg/kg bw
Based on:
act. ingr.
No mortality occurred.
Clinical signs:
other: Hunched posture was noted among most animals on Day 1.
Gross pathology:
No abnormalities were found at macroscopic post mortem examination of the animals.
Other findings:
Interpretation of results:
GHS criteria not met
The oral LD50 value was in excess of 2000 mg/kg bw
Executive summary:

The study was carried out based on the guidelines described in: OECD No.423 (2001) "Acute Oral Toxicity, Acute Toxic Class Method"; Commission Regulation (EC) No 440/2008, B1 tris: "Acute Oral Toxicity, Acute Toxic Class Method"; EPA, OPPTS 870.1100 (2002), "Acute Oral Toxicity"; JMAFF guidelines (2011) including the most recent partial revisions.

 DTPA-FE(NH4)2was administered by oral gavage to two subsequent groups of three female Wistar rats at 2000 mg/kg body weight. Animals were subjected to daily observations and weekly determination of body weight. Macroscopic examination was performed. No mortality occurred. Hunched posture was noted among most animals on Day 1. The body weight gain shown by the animals over the study period was considered to be normal.

No abnormalities were found at macroscopic post mortem examination of the animals. The oral LD50 value of DTPA-FE(NH4)2in Wistar rats was established to exceed 2000 mg/kg body weight. According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight.  

Based on these results, DTPA-FE(NH4)2does not have to be classified and has no obligatory labelling requirement for acute oral toxicity according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2011) andRegulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.



Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Quality of whole database:
One well performed study; result comparable to other metal chelates.

Acute toxicity: via inhalation route

Endpoint conclusion
Endpoint conclusion:
no study available

Acute toxicity: via dermal route

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Justification for classification or non-classification

No classification needed for acute oral exposure as the oral LD50 value is in excess of 2000 mg/kg bw. Based on the expected absence of acute inhalation and dermal toxicity (see also read across document in section 13), no classification needed for acute inhalation and dermal toxicity.