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Description of key information

The acute oral toxicity test did not show mortality at a limit dose of 2000 mg/kg bw and the 4-h inhalation toxicity study did not show mortality at the limit concentration of 5000 mg/m3.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records
Reference
Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
May-June 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study carried out under GLP
Qualifier:
according to
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test type:
acute toxic class method
Limit test:
yes
Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: ca. 10 weeks old
- Weight at study initiation:
- Fasting period before study: animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test substance
- Housing: group housing of 3 animals per cage
- Diet (e.g. ad libitum): ad lib
- Water (e.g. ad libitum): ad lib
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19.6 – 21.5
- Humidity (%): 38-75
- Air changes (per hr): ca. 15
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From 27 May To 16 June 2010
Route of administration:
oral: gavage
Vehicle:
water
Details on oral exposure:
Study was started with 3 females, later on 3 other females were treated.
Method: Oral gavage, using plastic feeding tubes.
Frequency: Single dosage, on Day 1.
Dose level (volume): 2000 mg/kg (10 mL/kg) body weight.
Doses:
2000 mg/kg bw
No. of animals per sex per dose:
6 females
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: twice daily observations on mortality, clinical signs at periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15, weekly weighing
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, histopathology, other: no
Statistics:
Not needed in a limit test
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Mortality:
None
Clinical signs:
Piloerection or hunched posture were noted in all animals on Day 1
Body weight:
The body weight gain shown by the animals over the study period was considered to be similar to that expected of normal untreated animals of the same age and strain
Gross pathology:
No abnormalities were found at macroscopic post mortem examination
Other findings:
No
Interpretation of results:
study cannot be used for classification
Remarks:
Migrated information
Conclusions:
Because no mortality was observed, the oral LD50 is 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 (2000) including the most recent partial revisions.

EDTA-MnNa2 was 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 after terminal sacrifice (Day 15).

No mortality occurred. Piloerection or hunched posture were noted in all animals on Day 1. The body weight gain shown by the animals over the study period was considered to be similar to that expected of normal untreated animals of the same age and strain. No abnormalities were found at macroscopic post mortem examination of the animals. The oral LD50 value of EDTA-MnNa2 in 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.

 

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Quality of whole database:
Study resullt in line with several other chelates (see also read across document in section 13)

Acute toxicity: via inhalation route

Link to relevant study records
Reference
Endpoint:
acute toxicity: inhalation
Type of information:
experimental study
Adequacy of study:
key study
Study period:
April-May 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study according to GLP
Qualifier:
according to
Guideline:
OECD Guideline 436 (Acute Inhalation Toxicity: Acute Toxic Class Method)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test type:
acute toxic class method
Limit test:
yes
Species:
rat
Strain:
Wistar
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: 8 weeks
- Weight at study initiation: 269 g (males), 165 g (females)
- Fasting period before study: not applicable
- Housing: groups of 3, in macrolon cages, with bedding of wood shavings and strips of paper
- Diet (e.g. ad libitum): ad lib, except during exposure
- Water (e.g. ad libitum): ad lib, except during exposure
- Acclimation period: 15 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20-24
- Humidity (%): 45-65 with short excursions to higher levels during cleaning activities
- Air changes (per hr): ca. 10
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 22 April To: 6 May 2010
Route of administration:
inhalation: aerosol
Type of inhalation exposure:
nose/head only
Vehicle:
other: water
Details on inhalation exposure:
GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: nose only inhalation chamber / modification of ADG Developments Ltd.
- Exposure chamber volume: ca. 50 L
- Method of holding animals in test chamber: in polycarbonate restraining tubes
- Source and rate of air: dry compressed air
- Method of conditioning air: test substance was diluted in water; as such compressed air became humidified
- System of generating particulates/aerosols: atomizing a solution of 650 g EDTA-MnNa2 per L water
- Method of particle size determination: 1- stage cascade impactor
- Treatment of exhaust air: filtered
- Temperature, humidity, pressure in air chamber: 23.4 ± 0.2 (23.1-23.6) degrees C; 86 ± 1% (84.9-86.6%); slightly positive pressure in central exposure cylinder; slightly negative pressure in surrounding hood

TEST ATMOSPHERE
- Brief description of analytical method used: gravimetric analysis
- Samples taken from breathing zone: yes

VEHICLE
- Composition of vehicle (if applicable): water
- Concentration of test material in vehicle (if applicable): 650 g/L
- Justification of choice of vehicle: EDTA-MnNa2 is soluble in water; by atomizing a solution in water and evaporation of the water, respirable particles will be generated
- Lot/batch no. (if required): not applicable
- Purity: not applicable

TEST ATMOSPHERE (if not tabulated)
- Particle size distribution: measured once before exposure and twice during exposure
- MMAD (Mass median aerodynamic diameter) / GSD (Geometric st. dev.):
measurement 1: MMAD = 3.3 µm, GSD = 2.8
measurement 2: MMAD = 3.2 µm, GSD = 2.5
measurement 3: MMAD = 3.3 µm, GSD = 2.4

CLASS METHOD (if applicable)
- Rationale for the selection of the starting concentration: no acute toxicity expected; therefore starting concentration for aerosol used, viz. 5 mg/L.
Analytical verification of test atmosphere concentrations:
no
Remarks:
not needed in case of gravimetry
Duration of exposure:
4 h
Concentrations:
5.16 mg/L
No. of animals per sex per dose:
3
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: days 0 (prior to exposure), days 1, 3, 7 and 14
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight
Statistics:
Not needes; single exposure only
Sex:
male/female
Dose descriptor:
LC50
Effect level:
> 5.16 mg/L air
Based on:
test mat.
Exp. duration:
4 h
Mortality:
None
Clinical signs:
other: None during exposure. Shortly after exposure, slight sniffing was heard in one male and 2 females. A slightly soiled fur of the head was observed in all 3 females. No other abnormalities were seen.
Body weight:
On days 1 and 3, body weighth gain had slowed down. The overall body weight gain in 14 days was as expected for animals of the strain and age.
Gross pathology:
Petechiae were seen on both lobes of the thymus in one male. A petechia aws seen on one lung lobe of one female. These minor abnormalities were not considered to be related to the exposure.
Other findings:
None
Interpretation of results:
study cannot be used for classification
Remarks:
Migrated information
Conclusions:
Because the 4-h LC50 was > 5.16 mg/L and signs observed during and after exposure were very limited, EDTA-MnNa2 is not toxic after inhalation and classification is not needed.
Executive summary:

The aim of the present study was to investigate the acute inhalation toxicity of EDTAMnNa2 in rats. Therefore, three male and three female animals were exposed to a target concentration of 5 g/m3 during a single period of four hours. Animals were kept for an observation period of 14 days before sacrifice. To characterize the toxicity, the animals were observed during exposure, shortly after exposure and daily thereafter, body weight was measured before exposure and 1, 3, 7 and 14 days after exposure and the animals were examined for gross pathological changes at necropsy. The actual concentration of the test compound during exposure was 5.16 g/m3, based on gravimetric analysis of the test atmosphere. Measured mass median aerodynamic diameters were 3.2 and 3.3 µm and the distribution of particle sizes had a geometric standard deviation (gsd) of 2.5 and 2.4, respectively. No abnormalities were seen during exposure. Shortly after exposure, however, sniffing was heard in one male and two female animals and a soiled fur of the head was noticed in all three female animals. The next day, these or other clinical abnormalities were no longer seen. Body weight gain was as expected for animals of this age and strain on days 7 and 14, but was decreased on days 1 and 3. The minor macroscopic abnormalities found at necropsy (petechiae on the lobes of the thymus in one male animal and one petechia on one lung lobe in one female animal) were not considered to be related to the exposure. Mortality did not occur during the 14-day observation period after a 4 -hour exposure by inhalation to a concentration of 5.16 g/m3 of EDTA-MnNa2. It is therefore concluded that the 4-hour LC50 is above 5.16 g/m3 for male and female rats. According to the OECD Guideline for Testing of Chemicals 436 EDTA-MnNa2 should be classified as “unclassified”.

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Quality of whole database:
Study resullt in line with several other chelates (see also read across document in section 13)

Acute toxicity: via dermal route

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Because there was no mortality, the oral LD50 of EDTA-MnNa2 is in excess of 2000 mg/kg bw; the 4 -h LC50 value of EDTA-MnNa2 is higher than 5.16 mg/L.

In an acute study in Swiss mice both MnSO4.H2O and a 1:1 mixture of MnSO4.H2O and EDTA-Na2H2/EDTA-Na4 were tested via a single intraperitoneal injection. The LD50 of EDTA-MnNa2 turned out to be 2332 mg EDTA-MnNa2 per kg bw. On a molar basis EDTA-MnNa2 was 7.5 times less toxic than the metal salt MnSO4.H2O.

Justification for selection of acute toxicity – oral endpoint

Well performed study according to GLP

Justification for selection of acute toxicity – inhalation endpoint

Well performed study according to GLP

Justification for classification or non-classification

Because of the absence of mortality at the limit concentrations tested in the dermal and inhalation study, no classification is needed.