Registration Dossier

Diss Factsheets

Administrative data

Description of key information

An acute oral study was conducted showing no toxicity. An acute inhalation study showed no toxicity. No dermal test was conducted on basis that dermal absorption unlikely.

Acute Oral Toxicity: Pooles (2009)

The acute oral median lethal dose (LD50) of the test material in the female Wistar rat was determined to be greater than 2000 mg/kg bw under the conditions of the test.

Acute Inhalation Toxicity: Griffiths (2010)

No deaths occurred in a group of ten rats exposed to a mean achieved atmosphere concentration of 5.35 mg/L for four hours. It was therefore considered that the acute inhalation median lethal concentration (4 hr LC50) of MnS, in the HsdHan:WIST stain rat, was greater than 5.34 mg/L.

Acute Dermal Toxicity

The physiochemical properties of MnO suggest it is unlikely to be absorbed through the skin. It has very poor water solubility and inorganic ions do not pass easily through the dermal barrier. In addition, MnO is not acutely toxic by the oral route and therefore it is highly unlikely that it would be toxic via the dermal route which in general absorbs chemicals to a much lesser degree than the gastrointestinal tract. Therefore in accordance with Annex VIII, section 8.5.3 column 2 adaptation, this test is not considered scientifically justified.

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:
2009-10-20 to 2009-11-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study conducted to current accepted guideline.
Qualifier:
according to guideline
Guideline:
OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.1 bis (Acute Oral Toxicity - Fixed Dose Procedure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Test type:
fixed dose procedure
Limit test:
yes
Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Harlan Laboratories UK, Ltd. Bicester, Oxon, UK
- Age at study initiation: 8 to 12 weeks
- Weight at study initiation: The bodyweight variation did not exceed ± 20 % of the initial/mean bodyweight of any previously dosed animals.
- Fasting period before study: Overnight fasting prior to dosing, and 3 to 4 hours post dosing.
- Housing: Animals were housed in groups of up to four in suspended solid-floor polypropylene cages furnished with woodflakes.
- Diet : 2014 Teklad Global Rodent diet supplied by Harlan Teklad Blackthorn (Bicester, Oxon, UK) available ad libitum
- Water : Mains tap water available ad libitum
- Acclimation period: A minimum of 5 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 to 25 °C
- Humidity (%): 30 to 70 %
- Air changes (per hr): A minimum of 15 changes per hour
- Photoperiod (hrs dark / hrs light): 12 hour cycle
Route of administration:
oral: gavage
Vehicle:
polyethylene glycol
Details on oral exposure:
VEHICLE
- Concentration in vehicle: 30 mg/mL at the 300 mg/kg dose level, 200 mg/mL at the 2000 mg/kg dose level
- Amount of vehicle (if gavage): 10 mL/kg
- Justification for choice of vehicle: Polyethylene glycol 400 was selected as the the vehicle as the test material did not dissolve/suspend in distilled water, arachis oil BP or dimethyl sulphoxide.
Doses:
2,000 mg/kg employed in the main test and 300 and 2,000 mg/kg in the sighting test.
No. of animals per sex per dose:
1 animal in each of the sighting dose levels, and 4 animals in the main test.
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Animals were weighed on days 0 and 7. Clinical observations were made at 30 minutes, then 1, 2 and 4 hours post dosing and then daily for fourteen days. Morbidity and mortality checks were made twice daily.
- Necropsy of survivors performed: yes, animals were killed by cervical dislocation at the end of the 14 day observation period
- Other examinations performed: clinical signs, body weight and histopathology
Statistics:
Data evaluations included the relationship (if any were noted) between the animal's exposure to the test material and the incidence and severity of all abnormalities including behavioural and clinical observations, gross lesions, bodyweight changes, mortality and any other toxicological effects. If possible the signs of evident toxicity were also identified. Evident toxicity is defined as the toxic effects which are of a severity such that administration at the next highest level could result in mortality.

Using mortality data, an estimate of the acute oral median lethal dose (LD50) of the test material was made.
Preliminary study:
At both levels of dosing in the sighting study, all animals showed expected bodyweight gains over the observation period. No signs of systemic toxicity were noted, and at necropsy.
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Remarks on result:
other: No signs of toxicity were noted at either 300 or 2000 mg/kg
Mortality:
No mortalities occurred during the study.
Clinical signs:
No signs of toxicity were noted during the study.
Body weight:
All animals exhibited expected bodyweight gains during the course of the study.
Gross pathology:
No macroscopic abnormalities were recorded at necropsy.
Other findings:
Not reported

Table 1: Clinical Observations and Mortality Data, Dose Level 300 mg/kg

 

Dose Level mg/kg

Animal No.

Effects Noted After Dosing (Hrs)

Effects Noted Post Dosing (Days)

½

1

2

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

 

300

1-0 Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

 

Table 2: Bodyweight and Bodyweight Changes, Dose Level 300 mg/kg

 

Dose Level mg/kg

Animal No.

Bodyweight (g) on Day

Bodyweight Gain (g) During Week

0

7

14

1

2

300

1-0 Female

159

171

186

12

15

 

Table 3: Necropsy Findings, Dose level 300 mg/kg

 

Dose Level mg/kg

Animal No.

Time of Death

Macroscopic Observations

300

1-0 Female

Killed Day 14

No abnormalities detected

 

Table 4: Clinical Observations and Mortality Data, Dose Level 2,000 mg/kg

Dose Level mg/kg

Animal No.

Effects Noted After Dosing (Hrs)

Effects Noted Post Dosing (Days)

½

1

2

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

2,000

2-0 Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

3-0 Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

3-1 Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

3-2 Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

3-3 Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

Table 5: Bodyweight and Bodyweight Changes, Dose Level 2,000 mg/kg

 

Dose Level mg/kg

Animal No.

Bodyweight (g) on Day

Bodyweight Gain (g) During Week

0

7

14

1

2

2,000

2-0 Female

180

191

202

11

11

3-0 Female

178

190

195

12

5

3-1 Female

188

199

206

11

7

3-2 Female

171

184

186

13

2

3-3 Female

166

181

189

15

8

 

Table 6: Necropsy Findings, Dose level 2,000 mg/kg

 

Dose Level mg/kg

Animal No.

Time of Death

Macroscopic Observations

2,000

2-0 Female

Killed Day 14

No abnormalities detected

3-0 Female

Killed Day 14

No abnormalities detected

3-1 Female

Killed Day 14

No abnormalities detected

3-2 Female

Killed Day 14

No abnormalities detected

3-3 Female

Killed Day 14

No abnormalities detected

Interpretation of results:
study cannot be used for classification
Conclusions:
The acute oral median lethal dose (LD50) of the test material in the female Wistar rat was determined to be greater than 2000 mg/kg bw under the conditions of the test.
Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Dose descriptor:
LD50
Value:
2 000 mg/kg bw

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:
09-12-2009 to 05-01-2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study conducted to current accepted guideline.
Qualifier:
according to guideline
Guideline:
OECD Guideline 403 (Acute Inhalation Toxicity)
Qualifier:
according to guideline
Guideline:
EU Method B.2 (Acute Toxicity (Inhalation))
GLP compliance:
yes
Test type:
fixed concentration procedure
Limit test:
yes
Species:
rat
Strain:
other: HsdHan: WIST
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Harlan Laboratories UK, Ltd. Bicester, Oxon, UK
- Age at study initiation: 8 to 12 weeks
- Weight at study initiation: The bodyweight varied between 200g to 357g*. * One male animal was slightly above the weight in the protocol (200g - 350g). This deviation was considered not to affect the purpose or validity of the study.
- Housing: Animals were housed in groups of five by sex in solid-floor polypropylene cages with stainless steel lids, furnished with softwood flakes.
- Diet : With the exception of the exposure period, free access to food (Harlan 2014 Rodent Diet, Harlan Laboratories UK Ltd, Oxon, UK) was allowed throughout the study.
- Water: With the exception of the exposure period, free access to mains drinking water was allowed throughout the study.
The diet, drinking water, bedding and chew blocks were routinely analysed and were considered not to contain any contaminants that could reasonably be expected to affect the purpose or integrity of the study.
- Acclimation period: A minimum of 5 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 to 25 °C
- Humidity (%): 30 to 70 %
- Air changes (per hr): A minimum of 15 changes per hour
- Photoperiod (hrs dark / hrs light): 12 hour cycle
Route of administration:
inhalation: dust
Type of inhalation exposure:
nose only
Vehicle:
other: unchanged (no vehicle)
Details on inhalation exposure:
GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: Consisted of a SAG 410 Solid Aerosol Generator (TOPAS GmbH, Dresden, Germany) located adjacent to the exposure chamber

- Exposure chamber volume: The cylindrical exposure chamber had a volume of approximately 30 litres (dimensions: 28 cm diameter x 50 cm high).

- Method of holding animals in test chamber: Each rat was individually held in a tapered, polycarbonate restraining tube fitted onto a single tier of the exposure chamber and sealed by means of a rubber 'O' ring. Only the nose of each animal was exposed to the test atmosphere

- Source and rate of air: The SAG 410 was connected to a meter compressed air supply.

- Method of conditioning air: Homogeneity of the test atmosphere within the chamber was not specifically determined during the study. Chambers of the same design (ADG Developments Lts, Hitchin, Herts, UK) have been fully validated and shown to produce evenly distributed atmospheres in the animals breathing zone with a wide variety of test materials (Green J D et al, 1984).

- System of generating particulates/aerosols: A dust atmosphere was produced from the test material using a SAG 410 Solid Aerosol Generator (TOPAS GmbH, Dresden, Germany). A particulate separator was introduced before the aerosol entered the exposure chamber in order to remove large particles and thereby increase the inhalable portion of the generated aerosol.

- Method of particle size determination: The particle size of the generated atmosphere inside the exposure chamber was determined three times during the exposure period using a Marple Personal Cascade Impactor (Westech IS Ltd, Beds., UK). This device consisted of six impactor stages (9.0, 6.3, 4.0, 1.7, 0.81 and 0.30 µm cut points) with stainless steel collection substrates and a back up glass fibre filter, housed in an aluminium sampler. The sampler was temporarily sealed in a sampling port in the animals' breathing zone and a suitable, known volume of exposure chamber air was drawn through it using a vacuum pump. The collection substrates and backup filter were weighed before and after sampling and the weight of test material, collected at each stage, calculated by difference. The mean amount for each stage was used to determine the cumulative amount below each cut-off point size. In this way, the proportion (%) of aerosol less than 9.0, 6.3, 4.0, 1.7, 0.81 and 0.30 µm was calculated.

- Treatment of exhaust air: The extract from the exposure chamber passed through a 'scrubber' trap and was connected with a high efficiency filter to a metered exhaust system.

- Temperature, humidity, pressure in air chamber: The temperature and relative humidity inside the exposure chamber were measured by an electronic thermometer/ humidity meter (Hanna Instruments Ltd, Beds., UK) located in a vacent port in the animals' breathing zone of the chamber and recorded every thirty minutes throughtout the four-hour exposure period. Oxygen levels within the exposure chamber were measured by an electronic oxygen analyser (Servomex (UK) Ltd, Crowborough, East Sussex) located in a vacant port in the animals' breathing zone of the chamber and recorded every thirty minutes through out the four-hour exposure period. The test atmosphere was generated to contain at least 19% oxygen.


TEST ATMOSPHERE
- Samples taken from breathing zone: yes. The actual chamber concentration was measured at regular intervals during the exposure period. The gravimetric method used glass fibre filters placed in a filter holder. The holder was temporarily sealed in a vacant port in the exposure chamber in the animals' breathing zone and a suitable, known volume of exposure chamber air was drawn through the filter using a vacuum pump.



TEST ATMOSPHERE (if not tabulated)
- Particle size distribution: The resulting values were converted to probits and plotted against Log10 cut-point size. From this plot, the Mass Median Aerodynamic Diameter (MMAD) was determined (as the 50% point) and the geometric standard deviation was calculated. In addition the proportion (%) of aerosol less than 4µm (considered to be the inhalable fraction) was determined. See table 2.

CLASS METHOD (if applicable)
- Rationale for the selection of the starting concentration: During characterisation, a group of two rats (one male, one female) were exposed to an atmosphere of the test material at a mean achieved atmosphere concentration of 2.11 mg/L for four hours. No significant effects were noted for either animal.

Duration of exposure:
4 h
Concentrations:
5.35 mg/L
No. of animals per sex per dose:
5 Male and 5 Female
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: All animals were observed for clinical signs at hourly intervals during exposure, immediately on removal from the restraining tubes at the end of exposure, one hour after termination of exposure and subsequently once daily for fourteen days. Any deaths or evidence of overt toxicity was recorded at each concentration. Individual bodyweights were recorded prior to treatment on the day of exposure and on Days 7 and 14 or at death.
- Necropsy of survivors performed: yes. At the end of the fourteen day observation period the surviving animals were killed by intravenous overdose of sodium pentobarbitone. All animals, including the one that died during the study, were subjected to a full external and internal examination, and any macroscopic abnormalities were recorded. The respiratory tract was subjected to a detailed macroscopic examination for signs of irritancy or local toxicity.
Statistics:
Data evaluations included the relationship, if any, between the animals' exposure to the test material and the incidence and severity of all abnormalities including behavioural and clinical observations, necropsy findings, bodyweight changes, mortality and any other toxicological effects.
Using the mortality data obtained, an estimate of the acute inhalation median lethal concentration (LC50) of the test material was made.
Preliminary study:
During characterisation, a group of two rats (one male, one female) were exposed to an atmosphere of the test material at a mean achieved atmosphere concentration of 2.11 mg/L for four hours. No significant effects were noted for either animal.
Sex:
male/female
Dose descriptor:
LC50
Effect level:
> 5.35 mg/L air (analytical)
Exp. duration:
4 h
Mortality:
No deaths occurred in a group of ten rats exposed to a mean achieved atmosphere concentration of 5.35 mg/L for four hours
Clinical signs:
other: Signs of hunched posture and pilo-erection are commonly seen in animals for short periods on removal from the chamber following 4-hour inhalation studies. Wet fur is commonly recorded both during and for a short period after exposure. Generalised fur stai
Body weight:
Individual bodyweights, together with weekly bodyweight changes, are given in table 9.
Variations in bodyweight gain are frequently seen for female animals of this strain and age during this type of study and, in isolation, are considered not to be significant.
All male animals and two females exhibited a bodyweight loss during Week 1 but recovered to show normal development during Week 2. Normal bodyweight development was noted for all other animals during the course of the study.
Gross pathology:
No macroscopic abnormalities were detected at necropsy
Other findings:
Nott reported

Table 3.The mortality data were summarised as follows:

 

Mean Achieved Atmosphere Concentration (mg/L)

Deaths

Male

Female

Total

5.35

0/5

0/5

0/10

 

Table 4.Exposure Chamber Atmosphere Concentration

 

Duration of Exposure (minutes)

Net Weight of Sample (mg)

Volume of Air Sampled (L)

Chamber Flow Rate (L/min)

Atmosphere Concentration (mg/L)

2

9.17

2

60

4.59

16

10.18

2

60

5.09

30

13.88

2

60

6.94

46

13.63

2

60

6.82

59

9.06

2

60

4.53

75

7.98

2

60

3.99

90

11.09

2

60

5.55

105

11.51

2

60

5.76

120

9.15

2

60

4.58

135

9.01

2

60

4.51

150

7.16

2

60

3.58

165

12.41

2

60

6.21

181

13.91

2

60

6.96

195

12.77

2

60

6.39

210

10.58

2

60

5.29

225

9.04

2

60

4.52

235

11.21

2

60

5.61

 

Mean achieved atmosphere concentration (mg/L) = 5.35

Standard deviation = 1.05

Test Material Used (g)

108

Air Flow (L/min)

60

Total Generation Time (mins)

243

Nominal Concentration (mg/L)

7.40

 

Particle size distribution

 

Table 5. Cascade Impactor Data

 

Impactor Stage Number

Cut Point (µm)

Amount Collected (mg) per sample number

Mean Amount Collected (mg)

1

2

3

3

9.0

0.05

0.06

0.00

0.04

4

6.3

0.28

0.30

0.17

0.25

5

4.0

0.81

0.85

0.50

0.72

6

1.7

0.46

0.45

0.32

0.41

7

0.81

0.16

0.19

0.08

0.14

8

0.30

0.01

0.05

0.02

0.03

Back-up filter

 < 0.30

0.01

0.02

0.03

0.02

Total Mean Amount of Test Material Collected

1.61

 

Table 6.Calculation

 

Cut Point (μm)

Log10 Cut Point

Mean Cumulative Amount Less Than Cut Point

(mg)

%

Probit

9.0

0.954

1.57

97.5

6.96

6.3

0.799

1.32

82.0

5.92

4.0

0.602

0.60

37.3

4.68

1.7

0.230

0.19

11.8

3.82

0.81

-0.092

0.05

3.11

3.14

0.30

-0.523

0.02

1.24

2.76

 

Mortality Data

 

Mean Achieved Atmosphere concentration

(mg/L)

Sex

Deaths

During

Exposure

Deaths Post Exposure

(1 Hour)

Deaths During Day of Observation

Total Deaths

1

2

3

4

5

6

7

8-14

5.35

Male

0

0

0

0

0

0

0

0

0

0

0/10

Female

0

0

0

0

0

0

0

0

0

0

 

Key To Clinical Observations

Fs = generalised green fur staining by the test material

H = hunched posture

P = pilo-erection

Ri = increased respiratory rate

RI = laboured respiration

Rn= noisy respiration

Sh = stained head

Wf= wet fur

O = no abnormalities detected

 

Table 7.Individual Clinical Observations (Day of Exposure)

 

Mean achieved atmosphere concentration(mg/L)

Animal number and sex

Hours during exposure

On removal

From chamber

One hour post-exposure

1

2

3

 

 

 

 

 

 

 

 

 

 

 

 

5.35

1 Male

Wf

Wf

Wf

Wf H P Ri Fs

 

2 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

3 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

4 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

5 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

6 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

7 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

8 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

9 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

10 Male

Wf

Wf

Wf

Wf H P Ri Fs

Wf H P Ri Fs

 

Table 8.Individual Clinical Observation (Recovery Period)

 

Mean achieved atmosphere concentration (mg/L)

Animal number and sex

Days post exposure

1

2

3

4

5

6

7

8-14

 

 

 

 

 

 

 

 

 

5.35

1 Male

H P Ri Fs

H Ri

Ri

0

0

0

0

0

2 Male

H P Ri Rn Fs

H Ri

Ri

0

0

0

0

0

3 Male

H P Ri Fs

H Ri

Ri

0

0

0

0

0

4 Male

H P Ri Rn Fs

H Ri

Ri

0

0

0

0

0

5 Male

H P Ri Fs

H Ri

Ri

0

0

0

0

0

6 Male

H P Ri Fs

H Ri

Ri

0

0

0

0

0

7 Male

H P Ri Rn Fs

H Ri

Ri

0

0

0

0

0

8 Male

H P Ri Rn Fs

H Ri

Ri

0

0

0

0

0

9 Male

H P Ri Rn Fs

H Ri

Ri

0

0

0

0

0

10 Male

H P Ri Rn Fs

H Ri

Ri

0

0

0

0

0

 

 

Table 9.Individual Bodyweights

 

Mean achieved atmosphere concentration (mg/L)

Animal number and sex

Bodyweight (g) on Day:

Increment (g) During Week:

0

7

14

1

2

 

 

 

 

5.35

1 Male

299

276

307

-23

31

2 Male

311

303

348

-8

45

3 Male

300

274

317

-26

43

4 Male

292

261

304

-31

43

5 Male

292

284

316

-8

32

6 Male

218

225

237

7

12

7 Male

220

229

236

9

7

8 Male

219

208

221

-11

13

9 Male

219

220

224

1

4

10 Male

227

224

241

-3

17

 

 

Table 10.Individual Necropsy Findings

 

Mean Achieved Atmosphere Concentration (mg/L)

Macroscopic Observation

Animal Number and Sex

1 Male

2 Male

3 Male

4 Male

5 Male

6 Male

7 Male

8 Male

9 Male

10 Male

5.35

 

N

N

N

N

N

N

N

N

N

N

 

 Table 11. Temperature and Relative Humidity in Exposure Chamber

 

Time (Minutes)

Chamber Temperature(°c) During Exposure

Chamber Relative Humidity (%) During Exposure

0

20

44

30

20

38

60

20

40

90

20

39

120

20

41

150

20

40

180

20

40

210

20

42

240

20

40

 

Table 12. Air Flow and Oxygen Concentration in Exposure Chamber

 

Time (Minutes)

Air Flow (L/min) During Exposure

Oxygen Concentration(%) During Exposure

-3

60

-

0

60

20.8

30

60

-

60

60

-

90

60

-

120

60

20.8

150

60

-

180

60

-

210

60

-

240

60

20.8

 

 

 

 

 

 

 

Interpretation of results:
study cannot be used for classification
Conclusions:
No deaths occurred in a group of ten rats exposed to a mean achieved atmosphere concentration of 5.35 mg/L for four hours.
It was therefore considered that the acute inhalation median lethal concentration (4 hr LC50) of MnS, in the HsdHan:WIST stain rat, was greater than 5.34 mg/L.
Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Dose descriptor:
LC50
Value:
5 000 mg/m³

Acute toxicity: via dermal route

Link to relevant study records
Reference
Endpoint:
acute toxicity: dermal
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
The physiochemical properties of MnO suggest it is unlikely to be absorbed through the skin. It has very poor water solubility and inorganic ions do not pass easily through the dermal barrier. In addition, MnO is not acutely toxic by the oral route and therefore it is highly unlikely that it would be toxic via the dermal route which in general absorbs chemicals to a much lesser degree than the gastrointestinal tract. Therefore in accordance with Annex VIII, section 8.5.3 column 2 adaptation, this test is not considered scientifically justified.
Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Acute Oral Toxicity: Pooles (2009)

The acute oral median lethal dose (LD50) of the test material in the female Wistar rat was determined to be greater than 2000 mg/kg bw under the conditions of the test.

Acute Inhalation Toxicity: Griffiths (2010)

No deaths occurred in a group of ten rats exposed to a mean achieved atmosphere concentration of 5.35 mg/L for four hours. It was therefore considered that the acute inhalation median lethal concentration (4 hr LC50) of MnS, in the HsdHan:WIST stain rat, was greater than 5.34 mg/L.

Justification for classification or non-classification

The LD50 was greater than 2000 mg/kg for the oral route. The acute inhalation result from MnO (> 5000 mg/m3) shows no classification is justified. No dermal absorption is expected for an inorganic substance.

In accordance with the criteria for classification as defined in Annex I, Regulation (EC) No 1272/2008, the material does not require classification with respect to acute toxicity.

Categories Display