Registration Dossier
Registration Dossier
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EC number: 205-440-9 | CAS number: 140-90-9
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- sodium O-ethyl dithiocarbonate
- Type of composition:
- boundary composition of the substance
- State / form:
- solid: bulk
- >= 82 - <= 100 % (w/w)
- Reference substance:
- sodium O-ethyl dithiocarbonate
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Name:
- sodium O-ethyl dithiocarbonate
- Type of composition:
- legal entity composition of the substance
- State / form:
- solid: bulk
- Related composition:
- sodium O-ethyl dithiocarbonate
- >= 82 - <= 100 % (w/w)
- Reference substance:
- sodium O-ethyl dithiocarbonate
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- Reference substance:
- sodium O-ethyl dithiocarbonate
- This impurity is considered relevant for the classification and labelling of the substance
- PBT status:
- the substance is not PBT / vPvB
- Justification:
When water is added to SEX it reacts with water to form the others substances: alcohol, sodium carbonate, trithiocarbonate and carbon disulphide because of its high water solubility.
Hydrolysis will be a significant factor in determining the environmental fate of SEX. In neutral or mildly alkaline solutions, Reaction mass of SEX decomposes to the alcohol, carbon disulphide, sodium carbonate and sodium trithiocarbonate, the two salts arising from neutralisation of carbon disulphide with the sodium hydroxide liberated. In more strongly alkaline media, hydrogen sulphide is liberated. However, strongly alkaline conditions are unlikely to be encountered under the conditions of use in the mining industry. The half-life at pH 7 at 25°C is reportedly about 260 hours, increasing to over 500 hours in the pH range 8 to 11.
SEX is hydrolytically unstable when exposed to acidic conditions, reverting rapidly to ethanol, carbon disulphide and sodium hydroxide, and therefore will not persist in the acidic environment of tailings dams. If discharged to waterways, the chemical would be likely to persist for at least some days, hydrolysing only slowly in this more neutral environment. However, it is not expected to bioaccumulate in view of its ionic character
SEX does not fulfil the criteria for persistency, bioaccumulation and toxicity as laid down in the TGD (EC, 2003). Therefore, this substance is not consideredon PBT or vPvBsubstance.
Referenceopen allclose all
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