Registration Dossier

Administrative data

Workers - Hazard via inhalation route

Systemic effects

Long term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
0.07 mg/m³
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
By inhalation
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
Overall assessment factor (AF):
75
Modified dose descriptor starting point:
NOAEC
DNEL value:
5 mg/m³
Explanation for the modification of the dose descriptor starting point:
NOAEC corrected = 10 x 6/8 x 5/5 x 6.7/10 = 5 mg/m3
AF for dose response relationship:
1
Justification:
This factor is applied because the dose-descriptor starting point is a NOAEC.
AF for differences in duration of exposure:
6
Justification:
DNEL is based on a subchronic study (90-day).
AF for interspecies differences (allometric scaling):
1
Justification:
AF not used for inhalation.
AF for other interspecies differences:
2.5
Justification:
A factor of 2.5 is applied for remaining difference.
AF for intraspecies differences:
5
Justification:
A factor of 5 is applied for worker DNELs.
AF for the quality of the whole database:
1
Justification:
The key study chosen for DNEL calculation is considered as a reliable study.
AF for remaining uncertainties:
1
Justification:
No other factor is applied.
Acute/short term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
Most sensitive endpoint:
acute toxicity
Route of original study:
By inhalation
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
repeated dose toxicity
Acute/short term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
DNEL related information

Workers - Hazard via dermal route

Systemic effects

Long term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
1.7 mg/kg bw/day
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
Oral
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
Overall assessment factor (AF):
100
Modified dose descriptor starting point:
NOAEL
DNEL value:
170 mg/kg bw/day
Explanation for the modification of the dose descriptor starting point:
Dermal absorption of thiourea through human skin in vivo has been studied by Feldmann (1970). Thiourea was penetrated in a quantity less than 1% of the applied dose (0.88% of the applied dose) in humans. A factor of 1% must be applied to take into account the difference of dermal absorption between animals and humans. NOAEC corrected = 17 x 100/1 = 170 mg/kg/d
AF for dose response relationship:
1
Justification:
This factor is applied because the dose-descriptor starting point is a NOAEL.
AF for differences in duration of exposure:
2
Justification:
DNEL is based on a subchronic study (90-day).
AF for interspecies differences (allometric scaling):
4
Justification:
An allometric scaling factor of 4 must be applied because the key study was performed on rats.
AF for other interspecies differences:
2.5
Justification:
A factor of 2.5 is applied for remaining difference.
AF for intraspecies differences:
5
Justification:
A factor of 5 is applied for worker DNELs.
AF for the quality of the whole database:
1
Justification:
The key study chosen for DNEL calculation is considered as a reliable study.
AF for remaining uncertainties:
1
Justification:
No other factor is applied.
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
acute toxicity
Route of original study:
Dermal
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
sensitisation (skin)
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
skin irritation/corrosion

Workers - Hazard for the eyes

Local effects

Hazard assessment conclusion:
no hazard identified

Additional information - workers

General Population - Hazard via inhalation route

Systemic effects

Long term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
0.01 mg/m³
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
By inhalation
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
Overall assessment factor (AF):
150
Modified dose descriptor starting point:
NOAEC
DNEL value:
1.79 mg/m³
Explanation for the modification of the dose descriptor starting point:
NOAEC corrected = 10 x 6/24 x 5/7 = 1.79 mg/m3
AF for dose response relationship:
1
Justification:
This factor is applied because the dose-descriptor starting point is a NOAEC.
AF for differences in duration of exposure:
6
Justification:
DNEL is based on a subacute study (28-day).
AF for interspecies differences (allometric scaling):
1
Justification:
AF not used for inhalation.
AF for other interspecies differences:
2.5
Justification:
A factor of 2.5 is applied for remaining difference.
AF for intraspecies differences:
10
Justification:
A factor of 10 is applied for the general population DNELs.
AF for the quality of the whole database:
1
Justification:
The key study chosen for DNEL calculation is considered as a reliable study.
AF for remaining uncertainties:
1
Justification:
No other factor is applied
Acute/short term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
Most sensitive endpoint:
acute toxicity
Route of original study:
By inhalation
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
repeated dose toxicity
Acute/short term exposure
Hazard assessment conclusion:
hazard unknown (no further information necessary)
DNEL related information

General Population - Hazard via dermal route

Systemic effects

Long term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
0.85 mg/kg bw/day
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
Oral
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
Overall assessment factor (AF):
200
Modified dose descriptor starting point:
NOAEL
DNEL value:
170 mg/kg bw/day
Explanation for the modification of the dose descriptor starting point:
Dermal absorption of thiourea through human skin in vivo has been studied by Feldmann (1970). Thiourea was penetrated in a quantity less than 1% of the applied dose (0.88% of the applied dose) in humans. A factor of 1% must be applied to take into account the difference of dermal absorption between animals and humans. NOAEC corrected = 17 x 100/1 = 170 mg/kg/d
AF for dose response relationship:
1
Justification:
This factor is applied because the dose-descriptor starting point is a NOAEL.
AF for differences in duration of exposure:
2
Justification:
DNEL is based on a subchronic study (90-day).
AF for interspecies differences (allometric scaling):
4
Justification:
An allometric scaling factor of 4 must be applied because the key study was performed on rats.
AF for other interspecies differences:
2.5
Justification:
A factor of 2.5 is applied for remaining difference.
AF for intraspecies differences:
10
Justification:
A factor of 10 is applied for the general population DNELs.
AF for the quality of the whole database:
1
Justification:
The key study chosen for DNEL calculation is considered as a reliable study.
AF for remaining uncertainties:
1
Justification:
No other factor is applied
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
acute toxicity
Route of original study:
Dermal
DNEL related information

Local effects

Long term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
sensitisation (skin)
Acute/short term exposure
Hazard assessment conclusion:
no hazard identified
Most sensitive endpoint:
skin irritation/corrosion

General Population - Hazard via oral route

Systemic effects

Long term exposure
Hazard assessment conclusion:
DNEL (Derived No Effect Level)
Value:
0.009 mg/kg bw/day
Most sensitive endpoint:
repeated dose toxicity
Route of original study:
Oral
DNEL related information
DNEL derivation method:
ECHA REACH Guidance
Overall assessment factor (AF):
200
Modified dose descriptor starting point:
NOAEL
DNEL value:
1.7 mg/kg bw/day
Explanation for the modification of the dose descriptor starting point:
Not necessary.
AF for dose response relationship:
1
Justification:
This factor is applied because the dose-descriptor starting point is a NOAEL.
AF for differences in duration of exposure:
2
Justification:
DNEL is based on a subchronic study (90-day).
AF for interspecies differences (allometric scaling):
4
Justification:
An allometric scaling factor of 4 must be applied because the key study was performed on rats.
AF for other interspecies differences:
2.5
Justification:
A factor of 2.5 is applied for remaining difference.
AF for intraspecies differences:
10
Justification:
A factor of 10 is applied for the general population DNELs.
AF for the quality of the whole database:
1
Justification:
The key study chosen for DNEL calculation is considered as a reliable study.
AF for remaining uncertainties:
1
Justification:
No other factor is applied
Acute/short term exposure
Hazard assessment conclusion:
low hazard (no threshold derived)
Most sensitive endpoint:
acute toxicity
Route of original study:
Oral
DNEL related information

General Population - Hazard for the eyes

Local effects

Hazard assessment conclusion:
no hazard identified

Additional information - General Population